Release v1.9.0: Custom Headers & Footers for Professional Document Exports

Comprehensive header and footer customization system for all standard export formats with dynamic field support and persistent settings. ✨ Major Features: - Custom Headers & Footers for PDF, DOCX, ODT, and PowerPoint exports - Three-column layout (Left/Center/Right) for both headers and footers - Dynamic field support: $PAGE$, $TOTAL$, $DATE$, $TIME$, $TITLE$, $AUTHOR$, $FILENAME$ - Logo/image upload UI for header and footer branding - Enable/disable toggle with persistent settings across sessions - Field insertion helper dialog for quick dynamic field selection - Complete dark theme support for all 22 themes 🎯 Export Format Support: - PDF (Standard): LaTeX fancyhdr package with automatic page numbering - DOCX (Standard): Word XML manipulation with PAGE and NUMPAGES fields - ODT: OpenDocument format with Pandoc integration - PowerPoint (PPTX): Footer text with dynamic field replacement - Batch Converter: Full header/footer support for all formats 💡 Technical Implementation: - processDynamicFields() function for field replacement - LaTeX header generation with fancyhdr and lastpage packages - Word XML manipulation using PizZip for DOCX headers/footers - addHeaderFooterToDocx() function for post-processing DOCX exports - buildPandocCommand() enhanced with header/footer parameters - IPC handlers for dialog communication and settings management 🎨 User Interface: - New "Header & Footer Settings..." menu option in File menu - Professional configuration dialog with field previews - Logo upload with file path display and clear buttons - Dynamic field picker popup dialog - Responsive grid layout for three-column design - Smooth transitions and animations 📦 Integration Points: - Menu system (File → Header & Footer Settings...) - Standard export functions (PDF, DOCX, ODT, PPTX) - Batch converter with full format support - Settings persistence via electron-store - Logo file management in userData directory 🔧 Code Changes: - src/main.js: Added header/footer IPC handlers, state management, processDynamicFields(), addHeaderFooterToDocx(), enhanced buildPandocCommand() and performBatchConversion() - src/index.html: Added header/footer dialog and field picker dialog - src/renderer.js: Added dialog management, logo handling, field insertion - src/styles.css: Added comprehensive dialog styling with dark theme support - package.json: Updated version to 1.9.0 - CLAUDE.md: Documented v1.9.0 features and implementation details 📝 Note: Enhanced exports (DOCX Enhanced, PDF Enhanced) use Word templates with pre-configured headers/footers. This feature specifically targets standard (non-templated) exports. 🚀 Impact: Users can now add professional headers and footers to all document exports with custom branding, dynamic page numbers, dates, and titles - significantly improving document presentation for business and academic use cases. 🤖 Generated with Claude Code Co-Authored-By: Claude <noreply@anthropic.com>
Update CLAUDE.md: Add v1.9.0 header/footer feature planning
2026-08-03 02:11:07 +05:30 · 2025-10-28 17:34:32 +05:30 · 2025-10-28 17:12:40 +05:30 · 2025-10-28 16:59:15 +05:30 · 2025-10-28 16:43:13 +05:30 · 2025-10-27 08:00:05 +05:30
184 changed files with 4689 additions and 52211 deletions
@@ -0,0 +1,43 @@
 {
  "permissions": {
    "allow": [
      "Bash(git checkout:*)",
      "Bash(npm install)",
      "Bash(npm run build:*)",
      "Bash(rmdir:*)",
      "Bash(powershell:*)",
      "Bash(npx electron-builder:*)",
      "Bash(dir dist)",
      "Bash(git tag:*)",
      "Bash(git push:*)",
      "Bash(gh release create:*)",
      "Bash(gh auth:*)",
      "Bash(gh release delete:*)",
      "Bash(gh release list:*)",
      "Bash(gh release upload:*)",
      "Bash(npm install:*)",
      "Bash(npm uninstall:*)",
      "Bash(git add:*)",
      "Bash(git commit:*)",
      "Bash(npm start)",
      "Read(//h/**)",
      "Bash(cd:*)",
      "Bash(npm run build:win-unsigned:*)",
      "Bash(dir:*)",
      "Bash(git merge:*)",
      "Bash(timeout:*)",
      "Bash(findstr:*)",
      "Bash(git stash:*)",
      "Bash(npm start:*)",
      "Bash(gh release delete-asset:*)",
      "Bash(git rm:*)",
      "Bash(gh release view:*)",
      "Bash(npm run build:linux:*)",
      "Bash(git reset:*)",
      "Read(//i/Template_exporter/**)",
      "Bash(copy \"I:\\Template_exporter\\md_to_docx_converter.py\" \"H:\\Development\\pan-converter\\word-template-exporter\"\" && copy \"I:Template_exporterrequirements.txt\" \"H:Developmentpan-converterword-template-exporter\"\")",
      "Bash(copy \"I:\\Template_exporter\\word_template.docx\" \"H:\\Development\\pan-converter\\word-template-exporter\"\")"
    ],
    "deny": []
  }
 }
@@ -0,0 +1,10 @@
 name: New MCP server
 version: 0.0.1
 schema: v1
 mcpServers:
  - name: New MCP server
    command: npx
    args:
      - -y
      - <your-mcp-server>
    env: {}
@@ -1,28 +0,0 @@
 name: CI
 on:
  push:
    branches: [master]
  pull_request:
    branches: [master]
 jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: 20
          cache: npm
      - name: Install dependencies
        run: npm ci
      - name: Run tests
        run: npm test
      - name: Run linter
        run: npm run lint
@@ -1,122 +0,0 @@
 name: Release
 on:
  push:
    tags: ['v*']
 permissions:
  contents: write
 jobs:
  build-linux:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: 20
          cache: npm
      - name: Install dependencies
        run: npm ci
      - name: Download external tools (pandoc)
        run: node scripts/download-tools.js
      - name: Run tests
        run: npm test
      - name: Build Linux packages
        run: npm run build:linux-ci -- --publish=never
      - name: Upload Linux artifacts
        uses: actions/upload-artifact@v4
        with:
          name: linux-artifacts
          path: |
            dist/*.deb
            dist/*.AppImage
            dist/*.snap
            dist/*.rpm
          retention-days: 5
  build-windows:
    runs-on: windows-latest
    steps:
      - uses: actions/checkout@v4
      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: 20
          cache: npm
      - name: Install dependencies
        run: npm ci
      - name: Download external tools (pandoc)
        run: node scripts/download-tools.js
      - name: Run tests
        run: npm test
      - name: Decode certificate (if available)
        if: ${{ env.CSC_LINK_BASE64 != '' }}
        shell: pwsh
        env:
          CSC_LINK_BASE64: ${{ secrets.CSC_LINK_BASE64 }}
        run: |
          $bytes = [Convert]::FromBase64String("$env:CSC_LINK_BASE64")
          [IO.File]::WriteAllBytes("${{ github.workspace }}\code-signing-cert.pfx", $bytes)
          echo "CERT_AVAILABLE=true" >> $env:GITHUB_ENV
      - name: Build Windows packages (signed)
        if: ${{ env.CERT_AVAILABLE == 'true' }}
        env:
          CSC_LINK: code-signing-cert.pfx
          CSC_KEY_PASSWORD: ${{ secrets.CSC_KEY_PASSWORD }}
        run: npm run build:win-signed -- --publish=never
      - name: Build Windows packages (unsigned)
        if: ${{ env.CERT_AVAILABLE != 'true' }}
        env:
          CSC_IDENTITY_AUTO_DISCOVERY: 'false'
        run: npm run build:win-unsigned -- --publish=never
      - name: Upload Windows artifacts
        uses: actions/upload-artifact@v4
        with:
          name: windows-artifacts
          path: |
            dist/*.exe
            dist/*.zip
          retention-days: 5
  release:
    needs: [build-linux, build-windows]
    if: always()
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Download Linux artifacts
        uses: actions/download-artifact@v4
        continue-on-error: true
        with:
          name: linux-artifacts
          path: dist
      - name: Download Windows artifacts
        uses: actions/download-artifact@v4
        continue-on-error: true
        with:
          name: windows-artifacts
          path: dist
      - name: Create GitHub Release
        uses: softprops/action-gh-release@v2
        with:
          generate_release_notes: true
          files: dist/*
@@ -8,41 +8,11 @@ Thumbs.db
 *.swp
 *.swo
 *~
-.vscode/*
+.vscode/
 !.vscode/launch.json
 .idea/
 *.iml
 out/
 .cache/
 .npm/
 .electron/
-# package-lock.json is intentionally tracked for reproducible CI builds
+package-lock.json
 # Downloaded tool binaries (fetched at build time via scripts/download-tools.js)
 bin/
 # Code signing certificates — never commit private keys
 *.pfx
 *.p12
 # Screenshots and temp files
 *.png.bak
 Screen.png
 dark.png
 light.png
 pdf.png
 uvmodal.png
 nul
 *.tmp
 # Development screenshots
 pdf\ modal.png
 # Claude/AI development files
 .claude/
 CLAUDE.md
 agents.md
 coverage/
 # Superpowers brainstorm artifacts
 .superpowers/
@@ -1,11 +0,0 @@
 {
  "semi": true,
  "singleQuote": true,
  "tabWidth": 2,
  "useTabs": false,
  "trailingComma": "es5",
  "bracketSpacing": true,
  "arrowParens": "always",
  "printWidth": 100,
  "endOfLine": "auto"
 }
@@ -1,469 +0,0 @@
 # Security Assessment Report: MarkdownConverter v4.0.0
 **Assessment Date:** 2026-03-15
 **Application:** MarkdownConverter - Electron-based Markdown editor and document converter
 **Target Version:** 4.0.0
 **Assessor:** Security Audit Agent
 ---
 ## Executive Summary
 This assessment identified **10 security findings** ranging from **Critical to Low severity**. The most significant concerns involve insecure Electron security configuration that could allow XSS attacks to escalate to full system access, arbitrary code execution via the REPL feature, and missing input validation on file operations.
 | Severity | Count |
 |----------|-------|
 | Critical | 2 |
 | High | 3 |
 | Medium | 3 |
 | Low | 2 |
 ---
 ## Vulnerability Findings
 ### CVE-MC-001: Insecure Electron Security Configuration (Critical)
 **CVSS 3.1 Score: 9.6 (Critical)**
 **CWE-265: CWE-1021: Improper Restriction of Renderers**
 **Location:** `src/main.js` (lines 328-332)
 ```javascript
 webPreferences: {
  nodeIntegration: true,
  contextIsolation: false,
  spellcheck: true
 },
 ```
 **Description:**
 The main application window has `nodeIntegration: true` and `contextIsolation: false`, which is the most insecure Electron configuration. This allows the renderer process direct access to Node.js APIs, meaning any XSS vulnerability in the markdown rendering or external content could lead to full system compromise.
 **Exploitability:**
 - An attacker who can inject malicious JavaScript (via markdown files, XSS in preview, or compromised dependencies) gains immediate access to:
  - Full file system read/write via `fs` module
  - Command execution via `child_process`
  - Network access via `net` module
  - All system resources
 **Attack Scenario:**
 1. User opens a malicious markdown file containing embedded JavaScript
 2. The JavaScript executes in the renderer with full Node.js access
 3. Attacker can read sensitive files, execute commands, exfiltrate data
 **Remediation:**
 ```javascript
 webPreferences: {
  nodeIntegration: false,
  contextIsolation: true,
  sandbox: true,
  preload: path.join(__dirname, 'preload.js')
 }
 ```
 **Note:** The preload.js file already implements a secure IPC bridge but it is not being utilized for the main window.
 ---
 ### CVE-MC-002: Arbitrary Code Execution via REPL Feature (Critical)
 **CVSS 3.1 Score: 9.3 (Critical)**
 **CWE-94: Improper Control of Generation of Code ('Code Injection')**
 **Location:** `src/main.js` (lines 4369-4396)
 **Description:**
 The `execute-code` IPC handler allows execution of arbitrary Python and Bash scripts through the REPL panel. While JavaScript execution appears to have been removed or limited, Python and Bash commands are executed via `execFile` with user-supplied code.
 **Vulnerable Code Pattern:**
 ```javascript
 ipcMain.handle('execute-code', async (event, { code, language }) => {
  // ...
  if (language === 'python' || language === 'py') {
    cmd = 'python';
    args = ['-c', code];
  }
  // ...
  execFile(cmd, args, { timeout }, (err, stdout, stderr) => {
    // ...
  });
 });
 ```
 **Exploitability:**
 - Users can be tricked into running malicious code blocks
 - Markdown files can contain executable code blocks with "Run" buttons
 - No sandboxing or permission restrictions on executed code
 **Attack Scenario:**
 1. Attacker creates markdown file with malicious Python code block
 2. User clicks "Run" button in preview
 3. Python code executes with user's full permissions
 4. Attacker gains code execution on victim's machine
 **Remediation:**
 - Remove arbitrary code execution feature entirely, OR
 - Implement strict sandboxing (Docker, VM, or restricted Python environment)
 - Add user confirmation dialogs with clear warnings
 - Execute in isolated environment with no filesystem/network access
 - Implement allowlist of safe operations
 ---
 ### CVE-MC-003: Potential XSS in Markdown Rendering (High)
 **CVSS 3.1 Score: 8.0 (High)**
 **CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')**
 **Location:** `src/renderer.js` (lines 387-419)
 **Description:**
 While DOMPurify is used to sanitize HTML, several extensions to marked.js may bypass sanitization:
 1. **Custom Admonition Extension (lines 51-77):**
 ```javascript
 marked.use({
    extensions: [{
        name: 'admonition',
        // ...
        renderer(token) {
            const inner = this.parser.parse(token.text);
            return `<div class="admonition admonition-${token.admonitionType}">
                <div class="admonition-title">${icon} ${token.admonitionType...}</div>
                <div class="admonition-content">${inner}</div>
            </div>`;
        }
    }]
 });
 ```
 2. **innerHTML Assignments (line 419):**
 ```javascript
 preview.innerHTML = sanitizedHtml;
 ```
 **Exploitability:**
 - Combined with CVE-MC-001, XSS leads to full system compromise
 - Custom markdown extensions may not be properly sanitized
 - Admonition type is directly interpolated into HTML without escaping
 **Remediation:**
 - Ensure all custom markdown extensions escape user input
 - Add Content Security Policy that blocks inline scripts
 - Use `textContent` instead of `innerHTML` where possible
 - Audit all custom marked.js extensions for XSS vectors
 ---
 ### CVE-MC-004: Missing Path Traversal Protection (High)
 **CVSS 3.1 Score: 7.8 (High)**
 **CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')**
 **Location:** `src/main.js` (lines 4241-4281)
 **Description:**
 The `list-directory` and `open-file-path` IPC handlers accept arbitrary file paths without validation:
 ```javascript
 ipcMain.handle('list-directory', async (event, dirPath) => {
  try {
    if (!dirPath) { /* dialog */ }
    // No path validation - accepts any path
    const entries = fs.readdirSync(dirPath, { withFileTypes: true });
    // ...
  }
 });
 ipcMain.on('open-file-path', (event, filePath) => {
  // No path validation
  if (!fs.existsSync(filePath)) return;
  const content = fs.readFileSync(filePath, 'utf-8');
  mainWindow.webContents.send('file-opened', { path: filePath, content });
 });
 ```
 **Exploitability:**
 - Malicious renderer code can read any file on the system
 - No restriction to a sandbox directory
 - Combined with XSS, attacker can exfiltrate sensitive files
 **Remediation:**
 ```javascript
 const ALLOWED_DIRECTORIES = [app.getPath('documents'), app.getPath('desktop')];
 function isPathAllowed(filePath) {
  const resolved = path.resolve(filePath);
  return ALLOWED_DIRECTORIES.some(dir => resolved.startsWith(dir));
 }
 ```
 ---
 ### CVE-MC-005: Weak Content Security Policy (High)
 **CVSS 3.1 Score: 7.5 (High)**
 **CWE-1021: Improper Restriction of Renderers**
 **Location:** `src/index.html` (line 5)
 ```html
 <meta http-equiv="Content-Security-Policy" content="default-src 'self';
  script-src 'self' 'unsafe-inline' 'unsafe-eval' https://cdn.jsdelivr.net;
  style-src 'self' 'unsafe-inline' https://cdnjs.cloudflare.com;
  img-src 'self' data: blob: file:;
  font-src 'self' data:;
  connect-src 'self' https://www.plantuml.com;">
 ```
 **Description:**
 The CSP contains several security weaknesses:
 1. **`'unsafe-inline'` in script-src** - Allows inline script injection
 2. **`'unsafe-eval'` in script-src** - Allows `eval()` and similar functions
 3. **`https://cdn.jsdelivr.net`** - Allows scripts from external CDN (supply chain risk)
 4. **`file:` in img-src** - Allows loading local files as images (potential information disclosure)
 **Exploitability:**
 - XSS attacks can execute arbitrary scripts
 - External CDN compromise could inject malicious code
 - `eval()` enables dynamic code execution
 **Remediation:**
 - Remove `'unsafe-inline'` and `'unsafe-eval'`
 - Use nonces or hashes for inline scripts
 - Remove external CDNs or use Subresource Integrity (SRI)
 - Remove `file:` from img-src
 ---
 ### CVE-MC-006: Insecure Window Configuration for PDF Export (Medium)
 **CVSS 3.1 Score: 6.5 (Medium)**
 **CWE-1021: Improper Restriction of Renderers**
 **Location:** `src/main.js` (lines 2579-2585)
 ```javascript
 const pdfWindow = new BrowserWindow({
  show: false,
  webPreferences: {
    nodeIntegration: true,
    contextIsolation: false
  }
 });
 ```
 **Description:**
 Hidden windows created for PDF export also have insecure configurations, allowing potential privilege escalation.
 **Remediation:**
 ```javascript
 webPreferences: {
  nodeIntegration: false,
  contextIsolation: true,
  sandbox: true
 }
 ```
 ---
 ### CVE-MC-007: PlantUML Server Data Exfiltration (Medium)
 **CVSS 3.1 Score: 5.3 (Medium)**
 **CWE-359: Exposure of Private Information**
 **Location:** `src/renderer.js` (lines 470-487)
 ```javascript
 const plantumlBlocks = preview.querySelectorAll('pre code.language-plantuml');
 plantumlBlocks.forEach((block) => {
    const code = block.textContent;
    // ...
    const encoded = plantumlEncode(code);
    const img = document.createElement('img');
    img.src = `https://www.plantuml.com/plantuml/svg/${encoded}`;
    // ...
 });
 ```
 **Description:**
 PlantUML diagram content is sent to an external server (plantuml.com) for rendering. This could leak sensitive information contained in diagrams.
 **Exploitability:**
 - Diagrams containing proprietary information, system architecture, or internal processes are sent to third-party servers
 - No user consent or notification before external data transmission
 **Remediation:**
 - Use local PlantUML rendering with Java
 - Add user warning before sending data to external service
 - Implement opt-in for external rendering
 ---
 ### CVE-MC-008: Inconsistent Security Settings Across Windows (Medium)
 **CVSS 3.1 Score: 5.5 (Medium)**
 **CWE-1021: Improper Restriction of Renderers**
 **Description:**
 Security settings are inconsistent across different windows:
 | Window | nodeIntegration | contextIsolation | Security |
 |--------|-----------------|------------------|----------|
 | Main Window | true | false | Insecure |
 | About Dialog | false | true | Secure |
 | Dependencies Dialog | false | true | Secure |
 | ASCII Generator | false | true | Secure |
 | Table Generator | false | true | Secure |
 | PDF Export Window | true | false | Insecure |
 | Hidden Conversion Window | true | false | Insecure |
 **Remediation:**
 Apply secure configuration (`nodeIntegration: false`, `contextIsolation: true`) consistently across all windows.
 ---
 ### CVE-MC-009: Command Execution via External Tools (Low)
 **CVSS 3.1 Score: 4.4 (Low)**
 **CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')**
 **Location:** `src/main.js` (lines 1915-1972)
 **Description:**
 While the application uses `execFile` instead of `exec` (good practice), external tools (Pandoc, LibreOffice, FFmpeg, ImageMagick) are invoked with file paths that could potentially be manipulated.
 **Positive Finding:**
 The code correctly uses `execFile` with argument arrays instead of shell commands, mitigating most command injection vectors.
 **Remaining Risk:**
 - File paths are not validated against malicious names
 - Special characters in filenames could cause issues with external tools
 **Remediation:**
 - Validate file paths before passing to external tools
 - Sanitize filenames of special characters
 ---
 ### CVE-MC-010: Missing Dependency Version Pinning (Low)
 **CVSS 3.1 Score: 3.5 (Low)**
 **CWE-1035: Using Components with Known Vulnerabilities**
 **Location:** `package.json`
 **Description:**
 Dependencies use `^` version ranges which could allow automatic updates to versions with vulnerabilities:
 ```json
 "dependencies": {
  "marked": "^17.0.3",
  "dompurify": "^3.3.1",
  "mermaid": "^11.12.3",
  // ...
 }
 ```
 **Remediation:**
 - Pin exact versions in production
 - Use lockfile (package-lock.json)
 - Implement dependency scanning in CI/CD pipeline
 ---
 ## Attack Surface Map
 ```
 ┌─────────────────────────────────────────────────────────────────┐
 │                    EXTERNAL ATTACK SURFACE                       │
 ├─────────────────────────────────────────────────────────────────┤
 │  Markdown Files (.md)     ─────► XSS via Preview Rendering      │
 │  Code Blocks              ─────► Arbitrary Code Execution       │
 │  PlantUML Diagrams        ─────► Data Exfiltration              │
 │  External CDNs            ─────► Supply Chain Attacks           │
 └─────────────────────────────────────────────────────────────────┘
                              │
                              ▼
 ┌─────────────────────────────────────────────────────────────────┐
 │                    RENDERER PROCESS (Insecure)                   │
 ├─────────────────────────────────────────────────────────────────┤
 │  nodeIntegration: true   ─────► Direct Node.js Access           │
 │  contextIsolation: false ─────► Prototype Pollution Risk        │
 │  DOMPurify Sanitization  ─────► May be bypassed via extensions  │
 │  Custom Marked Extensions ────► XSS Vectors                     │
 └─────────────────────────────────────────────────────────────────┘
                              │
                              ▼
 ┌─────────────────────────────────────────────────────────────────┐
 │                    IPC BRIDGE (Preload.js)                       │
 ├─────────────────────────────────────────────────────────────────┤
 │  Channel Whitelisting    ─────► Good Practice                   │
 │  Not Used for Main Window ────► Security Bypassed               │
 └─────────────────────────────────────────────────────────────────┘
                              │
                              ▼
 ┌─────────────────────────────────────────────────────────────────┐
 │                    MAIN PROCESS (Full Privileges)                │
 ├─────────────────────────────────────────────────────────────────┤
 │  File Operations         ─────► No Path Validation              │
 │  Code Execution          ─────► Python/Bash via REPL            │
 │  External Tools          ─────► Pandoc, FFmpeg, LibreOffice     │
 │  PDF Operations          ─────► Merge, Encrypt, Decrypt         │
 └─────────────────────────────────────────────────────────────────┘
 ```
 ---
 ## Positive Security Findings
 1. **Preload.js Implementation:** A secure IPC bridge with channel whitelisting is implemented
 2. **DOMPurify Usage:** HTML sanitization is applied to markdown output
 3. **execFile Usage:** External commands use `execFile` instead of `exec`
 4. **File Size Limits:** 50MB maximum file size is enforced
 5. **Rate Limiting:** Conversion operations have rate limiting (2 second minimum interval)
 6. **Error Message Sanitization:** Absolute paths are stripped from error messages
 ---
 ## Prioritized Remediation Roadmap
 ### Phase 1 - Critical (Immediate)
 1. Set `nodeIntegration: false` and `contextIsolation: true` for main window
 2. Remove or sandbox the code execution (REPL) feature
 3. Implement proper preload.js usage for all windows
 ### Phase 2 - High Priority (1-2 Weeks)
 4. Add path traversal protection to file operations
 5. Strengthen Content Security Policy
 6. Audit and fix custom markdown extensions for XSS
 ### Phase 3 - Medium Priority (1 Month)
 7. Implement consistent security settings across all windows
 8. Add local PlantUML rendering option
 9. Implement dependency scanning in CI/CD
 ### Phase 4 - Low Priority (Ongoing)
 10. Pin dependency versions
 11. Add security headers to all generated HTML
 12. Implement security logging and monitoring
 ---
 ## Compliance Considerations
 - **OWASP Top 10 2021:** A03:2021 - Injection, A05:2021 - Security Misconfiguration
 - **OWASP ASVS:** V12 - File Handling, V13 - API Security
 - **NIST CSF:** PR.AC - Access Control, PR.DS - Data Security
 ---
 ## Conclusion
 The MarkdownConverter application has significant security vulnerabilities that could allow an attacker to execute arbitrary code, access sensitive files, and compromise the user's system. The most critical issue is the insecure Electron configuration combined with XSS attack vectors in the markdown rendering pipeline.
 **Overall Security Rating: HIGH RISK**
 The positive finding is that much of the security infrastructure (preload.js, DOMPurify) is already in place but not properly utilized. With focused remediation effort, the application can achieve a much stronger security posture.
@@ -1,215 +0,0 @@
 # STRIDE Threat Model - MarkdownConverter v4.0.0
 **Analysis Date:** 2026-03-15
 **Methodology:** STRIDE + MITRE ATT&CK
 **Overall Risk Score:** 7.8 (HIGH)
 ---
 ## Executive Summary
 The analysis identified **10 vulnerabilities** with a combined risk score of **7.8 (HIGH)**. The most critical issues enable complete system compromise through XSS-to-RCE attack chains.
 ---
 ## Critical Findings
 | Priority | CVE | Vulnerability | CVSS | Impact |
 |----------|-----|---------------|------|--------|
 | P0 | CVE-MC-001 | Insecure Electron Config (`nodeIntegration: true`, `contextIsolation: false`) | 9.6 | Complete system compromise |
 | P0 | CVE-MC-002 | Arbitrary code execution via REPL feature | 9.3 | Remote code execution |
 | P1 | CVE-MC-003 | XSS in markdown rendering | 8.0 | Session hijacking, RCE chain |
 | P1 | CVE-MC-004 | Path traversal vulnerability | 7.8 | Arbitrary file write |
 | P1 | CVE-MC-005 | Weak Content Security Policy | 7.5 | XSS enablement |
 | P2 | CVE-MC-006 | Insecure window config for PDF export | 6.5 | Privilege escalation |
 | P2 | CVE-MC-007 | PlantUML server data exfiltration | 5.3 | Information disclosure |
 | P2 | CVE-MC-008 | Inconsistent security settings | 5.5 | Configuration weakness |
 | P3 | CVE-MC-009 | Command execution via external tools | 4.4 | Command injection risk |
 | P3 | CVE-MC-010 | Missing dependency version pinning | 3.5 | Supply chain risk |
 ---
 ## Key Attack Vectors
 ### 1. XSS to RCE Chain (Critical)
 ```
 Malicious Markdown File
        │
        ▼
 XSS in Preview (CVE-MC-003)
        │
        ▼
 nodeIntegration: true (CVE-MC-001)
        │
        ▼
 Full Node.js Access
        │
        ▼
 Complete System Compromise
 ```
 ### 2. REPL Code Execution (Critical)
 ```
 Code Block in Markdown
        │
        ▼
 User clicks "Run"
        │
        ▼
 REPL executes Python/Bash (CVE-MC-002)
        │
        ▼
 Arbitrary Code Execution
 ```
 ### 3. Data Exfiltration (Medium)
 ```
 PlantUML Diagram Content
        │
        ▼
 Sent to www.plantuml.com (CVE-MC-007)
        │
        ▼
 Sensitive Architecture Leaked
 ```
 ---
 ## STRIDE Analysis
 ### S - Spoofing
 | ID | Threat | Likelihood | Impact | Risk |
 |----|--------|------------|--------|------|
 | S1 | Attacker spoofs markdown file origin | Medium | High | High |
 | S2 | Malicious code pretends to be safe | High | Critical | Critical |
 ### T - Tampering
 | ID | Threat | Likelihood | Impact | Risk |
 |----|--------|------------|--------|------|
 | T1 | XSS modifies local files | High | Critical | Critical |
 | T2 | Conversion output tampered | Medium | Medium | Medium |
 ### R - Repudiation
 | ID | Threat | Likelihood | Impact | Risk |
 |----|--------|------------|--------|------|
 | R1 | No audit trail for operations | Low | Low | Low |
 ### I - Information Disclosure
 | ID | Threat | Likelihood | Impact | Risk |
 |----|--------|------------|--------|------|
 | I1 | XSS exposes file system | High | Critical | Critical |
 | I2 | PlantUML content leaked | Medium | Medium | Medium |
 | I3 | Error messages reveal paths | Low | Low | Low |
 ### D - Denial of Service
 | ID | Threat | Likelihood | Impact | Risk |
 |----|--------|------------|--------|------|
 | D1 | Malicious code crashes app | Medium | Medium | Medium |
 | D2 | Large file exhausts resources | Low | Low | Low |
 ### E - Elevation of Privilege
 | ID | Threat | Likelihood | Impact | Risk |
 |----|--------|------------|--------|------|
 | E1 | XSS → nodeIntegration → System | High | Critical | Critical |
 | E2 | REPL code execution | High | Critical | Critical |
 ---
 ## MITRE ATT&CK Mapping
 | Technique | ID | Applicability |
 |-----------|-----|---------------|
 | User Execution | T1204.002 | Malicious markdown file |
 | Command and Scripting Interpreter | T1059.007 | JavaScript via nodeIntegration |
 | Command and Scripting Interpreter | T1059.006 | Python via REPL |
 | Command and Scripting Interpreter | T1059.004 | Bash via REPL |
 | Exploit Public-Facing Application | T1190 | XSS in preview |
 | Data Exfiltration Over Web Service | T1043 | PlantUML server |
 | File and Directory Discovery | T1083 | Path traversal |
 ---
 ## Trust Boundaries
 ```
 ┌─────────────────────────────────────────────────────────────────────┐
 │                         TRUST BOUNDARY MAP                          │
 ├─────────────────────────────────────────────────────────────────────┤
 │                                                                     │
 │   ┌─────────────┐         ┌─────────────────────────────────────┐  │
 │   │   USER      │ ──────► │        APPLICATION                  │  │
 │   │ (Untrusted) │         │  ┌───────────┐  ┌───────────────┐  │  │
 │   └─────────────┘         │  │ Renderer  │  │ Main Process  │  │  │
 │                           │  │ (Sandbox) │  │ (Privileged)  │  │  │
 │                           │  └─────┬─────┘  └───────┬───────┘  │  │
 │                           │        │  IPC           │           │  │
 │                           │        ▼                ▼           │  │
 │                           │  ┌─────────────────────────────┐   │  │
 │                           │  │      File System            │   │  │
 │                           │  └─────────────────────────────┘   │  │
 │                           └─────────────────────────────────────┘  │
 │                                           │                        │
 │                                           ▼                        │
 │   ┌─────────────────────────────────────────────────────────────┐ │
 │   │                    EXTERNAL SERVICES                         │ │
 │   │  • PlantUML Server (www.plantuml.com)                       │ │
 │   │  • CDN (cdn.jsdelivr.net, cdnjs.cloudflare.com) [REMOVED]   │ │
 │   │  • External Tools (Pandoc, FFmpeg, LibreOffice)             │ │
 │   └─────────────────────────────────────────────────────────────┘ │
 │                                                                     │
 └─────────────────────────────────────────────────────────────────────┘
 ```
 ---
 ## Business Impact Analysis
 ### Successful Attack Consequences
 | Impact Category | Estimate |
 |-----------------|----------|
 | Data breach costs | $500,000 - $5,000,000+ |
 | Regulatory fines (GDPR) | Up to 4% annual revenue |
 | Reputation damage | Incalculable |
 | Business disruption | Hours to days |
 ### Affected Assets
 - User documents and files
 - System credentials
 - Proprietary information in diagrams
 - Application integrity
 ---
 ## Remediation Priority
 ### P0 - Immediate (24-48 hours)
 1. **CVE-MC-001**: Set `nodeIntegration: false`, `contextIsolation: true`
 2. **CVE-MC-002**: Remove or sandbox REPL code execution
 ### P1 - Short-term (1-2 weeks)
 3. **CVE-MC-003**: Audit markdown extensions for XSS
 4. **CVE-MC-004**: Add path validation (✅ COMPLETED)
 5. **CVE-MC-005**: Strengthen CSP (✅ COMPLETED)
 ### P2 - Medium-term (1 month)
 6. **CVE-MC-006**: Consistent window security settings
 7. **CVE-MC-007**: Add local PlantUML option or warning
 8. **CVE-MC-008**: Audit all BrowserWindow configurations
 ### P3 - Long-term
 9. **CVE-MC-009**: Validate filenames for external tools
 10. **CVE-MC-010**: Pin dependency versions, add scanning
 ---
 ## Conclusion
 The MarkdownConverter application has a **HIGH RISK** threat profile due to the combination of:
 - Untrusted content rendering (markdown preview)
 - Direct system access (nodeIntegration)
 - Code execution capability (REPL)
 **Immediate action required on P0 items to reduce attack surface.**
 The fixes applied in this session (CSP, path traversal, UI accessibility) have reduced the risk profile, but the critical nodeIntegration issue requires significant refactoring.
@@ -1,27 +0,0 @@
 {
  "target": "MarkdownConverter Electron Application",
  "status": "in_progress",
  "depth": "comprehensive",
  "compliance_frameworks": ["owasp"],
  "current_step": 3,
  "current_phase": 1,
  "completed_steps": ["vulnerability-scan", "threat-modeling"],
  "files_created": ["01-vulnerability-scan.md", "02-threat-model.md"],
  "started_at": "2026-03-15T00:09:00.000Z",
  "last_updated": "2026-03-15T00:25:00.000Z",
  "findings_summary": {
    "critical": 2,
    "high": 3,
    "medium": 3,
    "low": 2,
    "total": 10
  },
  "fixes_applied": {
    "csp_external_cdns_removed": true,
    "path_traversal_protection_added": true,
    "aria_labels_added": true,
    "focus_visible_styles_added": true,
    "tab_close_button_resized": true,
    "duplicate_font_size_fixed": true
  }
 }
@@ -1,522 +0,0 @@
 # Comprehensive UI Design Review - MarkdownConverter Electron Application
 ## Executive Summary
 This review covers the UI design of the MarkdownConverter Electron application, analyzing visual design, usability, code quality, and performance across all UI files. The application has a solid foundation but has several areas requiring attention.
 ---
 ## 1. Visual Design Review
 ### 1.1 Spacing & Layout Consistency
 | Severity | Issue | Location | Recommendation |
 |----------|-------|----------|----------------|
 | **Major** | Inconsistent padding values across files | Multiple CSS files | Standardize to 4px/8px base scale |
 | **Major** | Multiple reset declarations | `styles.css:1-5`, `styles-modern.css:42-47` | Consolidate resets into single file |
 | **Minor** | Tab padding varies between themes | `styles.css:36`, `styles-modern.css:101` | Use CSS variables for consistent padding |
 | **Minor** | Container padding inconsistency | `styles.css:17-21`, `styles-modern.css:63-69` | Define single container style |
 **Code Example - Duplicate Reset:**
 ```css
 /* styles.css:1-5 */
 * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
 }
 /* styles-modern.css:42-47 - DUPLICATE */
 * {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
 }
 ```
 **Fix Recommendation:**
 ```css
 /* Create a single base.css or remove from styles-modern.css */
 /* Use CSS variables for spacing scale */
 :root {
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
 }
 ```
 ### 1.2 Typography Consistency
 | Severity | Issue | Location | Recommendation |
 |----------|-------|----------|----------------|
 | **Major** | Font-family declared multiple times with different fallbacks | `styles.css:8`, `styles-modern.css:50`, `styles-concreteinfo.css:32` | Standardize font stack |
 | **Major** | Duplicate font-size declarations | `styles.css:228-230` | Remove duplicate |
 | **Minor** | Inconsistent line-height values | Multiple files | Create type scale variables |
 **Code Example - Duplicate font-size:**
 ```css
 /* styles.css:226-230 */
 .preview-content {
    max-width: none;
    margin: 0;
    padding: 20px 24px 24px 24px;
    line-height: 1.6;
    font-size: 15px;
    font-size: 14px;  /* DUPLICATE - overwrites previous */
 }
 ```
 **Fix Recommendation:**
 ```css
 /* styles.css - Remove duplicate */
 .preview-content {
    font-size: 14px;  /* Keep only one */
    line-height: 1.6;
 }
 ```
 ### 1.3 Color Usage and Contrast Accessibility
 | Severity | Issue | Location | Recommendation |
 |----------|-------|----------|----------------|
 | **Critical** | Hardcoded colors instead of CSS variables | `styles.css:27-29`, `styles.css:37-38`, etc. | Use CSS custom properties |
 | **Major** | Inconsistent gray scale definitions | Multiple files define different grays | Consolidate to single palette |
 | **Minor** | Some contrast ratios may be insufficient | Status bar text colors | Verify WCAG 2.1 AA compliance |
 **Code Example - Hardcoded colors:**
 ```css
 /* styles.css:27-29 */
 .tab-bar {
    background: #f0f0f0;  /* Should use var(--gray-100) */
    border-bottom: 1px solid #ddd;  /* Should use var(--gray-300) */
 }
 ```
 **Fix Recommendation:**
 ```css
 /* Use the existing palette from styles-modern.css */
 .tab-bar {
    background: var(--gray-100, #f3f4f6);
    border-bottom: 1px solid var(--gray-300, #d1d5db);
 }
 ```
 ### 1.4 Dark Mode Support Quality
 | Severity | Issue | Location | Recommendation |
 |----------|-------|----------|----------------|
 | **Major** | Dark theme selectors inconsistent | `styles.css` uses `body.theme-dark`, `styles-sidebar.css:108` uses `body[class*="dark"]` | Standardize selector pattern |
 | **Minor** | Missing dark theme support for some components | `.breadcrumb-bar`, command palette | Add dark mode variants |
 | **Suggestion** | Repetitive dark theme declarations | `styles-concreteinfo.css:362-425` | Use CSS custom properties for theming |
 **Code Example - Inconsistent selectors:**
 ```css
 /* styles.css */
 body.theme-dark .tab-bar { ... }
 /* styles-sidebar.css */
 body[class*="dark"] .sidebar-icons { ... }
 ```
 **Fix Recommendation:**
 ```css
 /* Choose one pattern and apply consistently */
 /* Option 1: Class-based (recommended) */
 body.theme-dark .tab-bar,
 body.theme-dark .sidebar-icons { ... }
 /* Option 2: Attribute-based */
 body[data-theme="dark"] .tab-bar { ... }
 ```
 ---
 ## 2. Usability Review
 ### 2.1 Clickable/Tappable Areas
 | Severity | Issue | Location | Recommendation |
 |----------|-------|----------|----------------|
 | **Critical** | Tab close button too small (16x16px) | `styles.css:62-77` | Increase to minimum 24x24px |
 | **Major** | Sidebar icons at minimum size | `styles-sidebar.css:35-47` (36x36px) | Consider 40-44px for better touch |
 | **Minor** | Toolbar buttons at edge of minimum | `styles.css:120-131` (32x32px) | Acceptable for mouse, small for touch |
 **Code Example - Small close button:**
 ```css
 /* styles.css:62-77 */
 .tab-close {
    width: 16px;   /* TOO SMALL - below 24px minimum */
    height: 16px;  /* TOO SMALL */
 }
 ```
 **Fix Recommendation:**
 ```css
 .tab-close {
    width: 24px;
    height: 24px;
    border-radius: 4px;
 }
 /* Add touch-friendly hit area */
 .tab-close::before {
    content: '';
    position: absolute;
    top: -4px;
    left: -4px;
    right: -4px;
    bottom: -4px;
 }
 ```
 ### 2.2 Hover/Focus States
 | Severity | Issue | Location | Recommendation |
 |----------|-------|----------|----------------|
 | **Critical** | Missing focus-visible styles | All interactive elements | Add :focus-visible for keyboard navigation |
 | **Major** | No focus indicators on toolbar buttons | `styles.css:133-140` | Add visible focus ring |
 | **Minor** | Inconsistent hover transitions | Various components | Standardize transition duration |
 **Code Example - Missing focus styles:**
 ```css
 /* styles.css:120-131 - No focus state */
 .toolbar button {
    /* ... no focus style */
 }
 .toolbar button:hover {
    background: #e0e0e0;
    border-color: #ccc;
 }
 ```
 **Fix Recommendation:**
 ```css
 .toolbar button:focus-visible {
    outline: 2px solid var(--primary-dark, #5661b3);
    outline-offset: 2px;
 }
 .toolbar button:hover {
    background: #e0e0e0;
    border-color: #ccc;
 }
 ```
 ### 2.3 Loading and Error State Handling
 | Severity | Issue | Location | Recommendation |
 |----------|-------|----------|----------------|
 | **Major** | Generic error message without styling | `renderer.js:384-386`, `renderer.js:508-511` | Create styled error components |
 | **Minor** | No loading indicators for async operations | Sidebar panels | Add skeleton loaders or spinners |
 | **Minor** | `git-loading` class exists but minimal styling | `styles-sidebar.css:227` | Enhance with animation |
 **Code Example - Plain error display:**
 ```javascript
 // renderer.js:384-386
 preview.innerHTML = '<p style="color: red; padding: 20px;">Error: Required libraries...';
 // Inline styles should be in CSS
 ```
 **Fix Recommendation:**
 ```css
 /* Add to styles.css */
 .preview-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    color: var(--ci-danger, #dc3545);
    text-align: center;
 }
 .preview-error-icon {
    font-size: 48px;
    margin-bottom: 16px;
 }
 ```
 ### 2.4 Accessibility (ARIA, Semantic HTML)
 | Severity | Issue | Location | Recommendation |
 |----------|-------|----------|----------------|
 | **Critical** | Buttons without accessible labels | `index.html:31` (tab close), `index.html:33` (new tab) | Add aria-label |
 | **Critical** | SVG icons lack aria-hidden | All toolbar buttons | Add aria-hidden="true" |
 | **Major** | Missing role attributes on tabs | `index.html:29-33` | Add role="tablist", role="tab" |
 | **Major** | No skip links | `index.html` | Add skip to main content link |
 | **Minor** | Dialog missing aria-modal | Export dialogs | Add aria-modal="true" |
 **Code Example - Missing accessibility attributes:**
 ```html
 <!-- index.html:31 - Current -->
 <button class="tab-close" title="Close tab">x</button>
 <!-- index.html:33 - Current -->
 <button class="new-tab-button" id="new-tab-btn" title="New tab">+</button>
 ```
 **Fix Recommendation:**
 ```html
 <!-- Improved with ARIA -->
 <div class="tab-bar" id="tab-bar" role="tablist" aria-label="Document tabs">
    <div class="tab active" data-tab-id="1" role="tab" aria-selected="true" aria-controls="tab-content-1">
        <span class="tab-title">Untitled</span>
        <button class="tab-close" aria-label="Close tab" title="Close tab">×</button>
    </div>
    <button class="new-tab-button" id="new-tab-btn" aria-label="Create new tab" title="New tab">+</button>
 </div>
 <!-- SVG icons should have aria-hidden -->
 <button id="btn-bold" title="Bold (Ctrl+B)" aria-label="Bold">
    <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true">
        ...
    </svg>
 </button>
 ```
 ### 2.5 Keyboard Navigation
 | Severity | Issue | Location | Recommendation |
 |----------|-------|----------|----------------|
 | **Major** | Tab order may skip sidebar icons | Sidebar panel | Verify logical tab order |
 | **Minor** | No escape key handling for dialogs | Export dialogs | Add escape to close |
 | **Minor** | Find dialog lacks full keyboard support | `renderer.js:804-866` | Add Ctrl+F shortcut hint |
 ---
 ## 3. Code Quality Review
 ### 3.1 CSS Organization & Naming
 | Severity | Issue | Location | Recommendation |
 |----------|-------|----------|----------------|
 | **Major** | No clear CSS architecture | All CSS files | Adopt BEM or similar methodology |
 | **Major** | Overly generic class names | `.pane`, `.tab`, `.container` | Use more specific naming |
 | **Minor** | Mixed naming conventions | camelCase (`tabBar`), kebab-case (`tab-bar`) | Standardize to kebab-case |
 | **Minor** | Magic numbers | Various pixel values | Replace with spacing variables |
 ### 3.2 CSS Specificity Issues
 | Severity | Issue | Location | Recommendation |
 |----------|-------|----------|----------------|
 | **Major** | Excessive use of `!important` | `styles.css:14` | Restructure to avoid |
 | **Major** | Deep selector nesting | Dark theme selectors | Flatten and use CSS variables |
 | **Minor** | ID selectors for styling | `styles.css:233-247` | Prefer class selectors |
 **Code Example - Problematic specificity:**
 ```css
 /* styles.css:14 - Avoid !important */
 .hidden {
    display: none !important;
 }
 /* styles.css:397-431 - Deep nesting */
 body.theme-dark #preview h1,
 body.theme-dark [id^="preview-"] h1,
 body.theme-dark .preview-content h1 {
    color: #c9d1d9;
    border-bottom-color: #21262d;
 }
 ```
 **Fix Recommendation:**
 ```css
 /* Use utility class pattern */
 [hidden] { display: none; }
 /* Use CSS custom properties for theming */
 .preview-content h1 {
    color: var(--text-primary);
    border-bottom-color: var(--border-color);
 }
 /* Theme applies variables */
 body.theme-dark {
    --text-primary: #c9d1d9;
    --border-color: #21262d;
 }
 ```
 ### 3.3 Reusable Style Definitions
 | Severity | Issue | Location | Recommendation |
 |----------|-------|----------|----------------|
 | **Major** | Repeated button styles | Multiple files | Create button component classes |
 | **Major** | Dialog styles duplicated | Export, batch, print preview dialogs | Create modal component |
 | **Minor** | Similar form field styles scattered | Export dialog inputs | Create form component |
 **Code Example - Duplicated button styles:**
 ```css
 /* styles.css */
 .toolbar button { /* button styles */ }
 .tab-close { /* button styles */ }
 .new-tab-button { /* button styles */ }
 #export-dialog-close { /* button styles */ }
 /* styles-sidebar.css */
 .sidebar-icon { /* similar button styles */ }
 .sidebar-panel-close { /* similar button styles */ }
 ```
 **Fix Recommendation:**
 ```css
 /* Create button component system */
 .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
 }
 .btn--icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
 }
 .btn--close {
    font-size: 14px;
    font-weight: bold;
    border-radius: var(--radius-sm);
 }
 ```
 ### 3.4 Documentation
 | Severity | Issue | Location | Recommendation |
 |----------|-------|----------|----------------|
 | **Minor** | Limited CSS documentation | All CSS files | Add section comments |
 | **Minor** | No component documentation | Sidebar components | Add JSDoc-style comments |
 | **Suggestion** | No design tokens documentation | CSS variables | Create tokens documentation |
 ---
 ## 4. Performance Review
 ### 4.1 CSS Optimization
 | Severity | Issue | Location | Recommendation |
 |----------|-------|----------|----------------|
 | **Major** | Large CSS files (105KB main, 78KB modern) | `styles.css`, `styles-modern.css` | Split into smaller modules |
 | **Major** | Duplicate style definitions | Multiple files | Remove redundancies |
 | **Minor** | Unused styles likely present | Theme variations | Audit and remove unused |
 ### 4.2 Asset Loading
 | Severity | Issue | Location | Recommendation |
 |----------|-------|----------|----------------|
 | **Major** | highlight.js CSS loaded synchronously | `index.html:14` | Load asynchronously or bundle |
 | **Minor** | Font files could be preloaded | `fonts.css` | Add preload links in HTML |
 | **Suggestion** | Consider CSS critical path | Above-the-fold styles | Inline critical CSS |
 **Code Example - Sync stylesheet loading:**
 ```html
 <!-- index.html:14 - Blocks rendering -->
 <link rel="stylesheet" href="../node_modules/highlight.js/styles/default.css">
 ```
 **Fix Recommendation:**
 ```html
 <!-- Non-blocking load -->
 <link rel="stylesheet" href="../node_modules/highlight.js/styles/default.css" media="print" onload="this.media='all'">
 <!-- Or preload fonts -->
 <link rel="preload" href="../assets/fonts/Inter-Regular.woff2" as="font" type="font/woff2" crossorigin>
 ```
 ### 4.3 Animation Performance
 | Severity | Issue | Location | Recommendation |
 |----------|-------|----------|----------------|
 | **Minor** | Some transitions on expensive properties | `styles-modern.css:111-112` | Prefer transform/opacity |
 | **Suggestion** | Missing will-change hints | Complex animations | Add will-change for GPU hints |
 ---
 ## 5. Component-Specific Issues
 ### 5.1 Tab System
 | File | Issues |
 |------|--------|
 | `styles.css:23-97` | Inconsistent active state styling, small close button |
 | `renderer.js:88-346` | Tab content created via innerHTML (XSS risk) |
 ### 5.2 Sidebar
 | File | Issues |
 |------|--------|
 | `styles-sidebar.css` | Good structure but missing focus states |
 | `sidebar-manager.js` | Clean implementation, needs ARIA |
 ### 5.3 Export Dialogs
 | File | Issues |
 |------|--------|
 | `styles.css:1060-1355` | Monolithic, should be component |
 | `index.html:171-331` | Complex nested structure needs semantic HTML |
 ### 5.4 Welcome Screen
 | File | Issues |
 |------|--------|
 | `styles-welcome.css` | Minimal styles, good foundation |
 | Missing hover states for keyboard focus | Add :focus-visible |
 ---
 ## 6. Prioritized Fix Recommendations
 ### Critical (Immediate)
 1. **Add missing ARIA attributes** to all interactive elements
 2. **Increase tab close button size** to minimum 24x24px
 3. **Add focus-visible styles** for keyboard navigation
 4. **Fix duplicate font-size declaration** in `.preview-content`
 ### Major (Next Sprint)
 1. **Consolidate CSS resets** into single location
 2. **Create button component system** with variants
 3. **Standardize dark theme selectors** across all files
 4. **Replace hardcoded colors** with CSS variables
 5. **Create modal/dialog component** to reduce duplication
 ### Minor (Future)
 1. **Document CSS architecture** and naming conventions
 2. **Audit and remove unused styles**
 3. **Add loading state components** (skeletons, spinners)
 4. **Implement CSS module splitting** for better performance
 ---
 ## 7. Summary Statistics
 | Category | Critical | Major | Minor | Suggestions |
 |----------|----------|-------|-------|-------------|
 | Visual Design | 1 | 5 | 4 | 1 |
 | Usability | 3 | 4 | 4 | 0 |
 | Code Quality | 0 | 6 | 4 | 1 |
 | Performance | 0 | 3 | 2 | 2 |
 | **Total** | **4** | **18** | **14** | **4** |
 ---
 ## Conclusion
 The MarkdownConverter application has a functional UI with good visual variety through its theme system. However, there are significant opportunities for improvement in:
 1. **Accessibility** - Critical for users with disabilities
 2. **Code organization** - Reduce CSS duplication and improve maintainability
 3. **Component consistency** - Standardize interactive element sizing and states
 4. **Performance** - Optimize CSS loading and reduce bundle size
 Addressing the Critical and Major issues will significantly improve both user experience and code maintainability.
@@ -1,17 +0,0 @@
 {
  "review_id": "full-ui-review_20260315",
  "target": "src/ (Entire UI Directory)",
  "focus_areas": ["visual", "usability", "code", "performance"],
  "context": "comprehensive",
  "platform": "desktop",
  "status": "complete",
  "started_at": "2026-03-15T00:09:00.000Z",
  "completed_at": "2026-03-15T00:12:00.000Z",
  "issues_found": 40,
  "severity_counts": {
    "critical": 4,
    "major": 18,
    "minor": 14,
    "suggestion": 4
  }
 }
@@ -0,0 +1,3 @@
 {
  "CurrentProjectSetting": null
 }
@@ -0,0 +1,7 @@
 {
  "ExpandedNodes": [
    ""
  ],
  "SelectedNode": "\\package.json",
  "PreviewInSolutionExplorer": false
 }
@@ -0,0 +1,41 @@
 {
  "Version": 1,
  "WorkspaceRootPath": "H:\\Development\\pan-converter\\",
  "Documents": [
    {
      "AbsoluteMoniker": "D:0:0:{A2FE74E1-B743-11D0-AE1A-00A0C90FFFC3}|\u003CMiscFiles\u003E|H:\\Development\\pan-converter\\package.json||{90A6B3A7-C1A3-4009-A288-E2FF89E96FA0}",
      "RelativeMoniker": "D:0:0:{A2FE74E1-B743-11D0-AE1A-00A0C90FFFC3}|\u003CMiscFiles\u003E|solutionrelative:package.json||{90A6B3A7-C1A3-4009-A288-E2FF89E96FA0}"
    }
  ],
  "DocumentGroupContainers": [
    {
      "Orientation": 0,
      "VerticalTabListWidth": 256,
      "DocumentGroups": [
        {
          "DockedWidth": 200,
          "SelectedChildIndex": 0,
          "Children": [
            {
              "$type": "Document",
              "DocumentIndex": 0,
              "Title": "package.json",
              "DocumentMoniker": "H:\\Development\\pan-converter\\package.json",
              "RelativeDocumentMoniker": "package.json",
              "ToolTip": "H:\\Development\\pan-converter\\package.json",
              "RelativeToolTip": "package.json",
              "ViewState": "AgIAAAAAAAAAAAAAAAAAAAsAAAAqAAAAAAAAAA==",
              "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.001642|",
              "WhenOpened": "2025-10-11T13:44:30.357Z",
              "EditorCaption": ""
            },
            {
              "$type": "Bookmark",
              "Name": "ST:0:0:{cce594b6-0c39-4442-ba28-10c64ac7e89f}"
            }
          ]
        }
      ]
    }
  ]
 }
@@ -0,0 +1,41 @@
 {
  "Version": 1,
  "WorkspaceRootPath": "H:\\Development\\pan-converter\\",
  "Documents": [
    {
      "AbsoluteMoniker": "D:0:0:{A2FE74E1-B743-11D0-AE1A-00A0C90FFFC3}|\u003CMiscFiles\u003E|H:\\Development\\pan-converter\\package.json||{90A6B3A7-C1A3-4009-A288-E2FF89E96FA0}",
      "RelativeMoniker": "D:0:0:{A2FE74E1-B743-11D0-AE1A-00A0C90FFFC3}|\u003CMiscFiles\u003E|solutionrelative:package.json||{90A6B3A7-C1A3-4009-A288-E2FF89E96FA0}"
    }
  ],
  "DocumentGroupContainers": [
    {
      "Orientation": 0,
      "VerticalTabListWidth": 256,
      "DocumentGroups": [
        {
          "DockedWidth": 200,
          "SelectedChildIndex": 0,
          "Children": [
            {
              "$type": "Document",
              "DocumentIndex": 0,
              "Title": "package.json",
              "DocumentMoniker": "H:\\Development\\pan-converter\\package.json",
              "RelativeDocumentMoniker": "package.json",
              "ToolTip": "H:\\Development\\pan-converter\\package.json",
              "RelativeToolTip": "package.json",
              "ViewState": "AgIAAAAAAAAAAAAAAAAAAAsAAAAqAAAAAAAAAA==",
              "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.001642|",
              "WhenOpened": "2025-10-11T13:44:30.357Z",
              "EditorCaption": ""
            },
            {
              "$type": "Bookmark",
              "Name": "ST:0:0:{cce594b6-0c39-4442-ba28-10c64ac7e89f}"
            }
          ]
        }
      ]
    }
  ]
 }
@@ -1,48 +0,0 @@
 {
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Debug Main Process",
      "type": "node",
      "request": "launch",
      "cwd": "${workspaceFolder}",
      "runtimeExecutable": "${workspaceFolder}/node_modules/.bin/electron",
      "windows": {
        "runtimeExecutable": "${workspaceFolder}/node_modules/.bin/electron.cmd"
      },
      "args": ["."],
      "outputCapture": "std",
      "env": {
        "NODE_ENV": "development"
      }
    },
    {
      "name": "Debug Renderer Process",
      "type": "chrome",
      "request": "attach",
      "port": 9222,
      "webRoot": "${workspaceFolder}/src",
      "timeout": 30000
    },
    {
      "name": "Debug Main + Renderer",
      "type": "node",
      "request": "launch",
      "cwd": "${workspaceFolder}",
      "runtimeExecutable": "${workspaceFolder}/node_modules/.bin/electron",
      "windows": {
        "runtimeExecutable": "${workspaceFolder}/node_modules/.bin/electron.cmd"
      },
      "args": [".", "--remote-debugging-port=9222"],
      "outputCapture": "std",
      "env": {
        "NODE_ENV": "development"
      },
      "serverReadyAction": {
        "pattern": "listening on port ([0-9]+)",
        "uriFormat": "http://localhost:%s",
        "action": "debugWithChrome"
      }
    }
  ]
 }
@@ -1,25 +0,0 @@
 # Repository Guidelines
 ## Project Structure & Module Organization
 Core application code lives in `src/`. Use `src/main.js` for the Electron main process, `src/preload.js` for the preload bridge, and `src/renderer.js` plus `src/editor/`, `src/sidebar/`, `src/repl/`, and `src/utils/` for renderer-side features. Electron adapter code is in `src/adapters/electron/`. Reusable markdown/document templates live in `src/templates/`. Static assets and icons are in `assets/`. Tests are in `tests/`, and build output goes to `dist/`.
 ## Build, Test, and Development Commands
 - `npm start`: launch the Electron app locally.
 - `npm test`: run the Jest suite once.
 - `npm run test:watch`: rerun tests during local development.
 - `npm run test:coverage`: generate coverage output.
 - `npm run lint` / `npm run lint:fix`: check or fix ESLint issues in `src` and `tests`.
 - `npm run format` / `npm run format:check`: apply or verify Prettier formatting.
 - `npm run build:linux`, `npm run build:win`, `npm run build:mac`: create platform packages with `electron-builder`.
 ## Coding Style & Naming Conventions
 This repo uses Prettier and ESLint. Follow `.prettierrc`: 2-space indentation, single quotes, semicolons, trailing commas where valid in ES5, and a 100-character line width. Prefer `camelCase` for variables/functions, `PascalCase` for classes, and kebab-case for file names only when already established. Keep module boundaries clear: UI logic in renderer modules, OS/file-system work behind Electron IPC and adapters.
 ## Testing Guidelines
 Tests use Jest with `jest-environment-jsdom`. Add new tests under `tests/` with `*.test.js` names, mirroring the feature area when possible, for example `tests/sidebar.test.js` or `tests/print-preview.test.js`. Update or add regression tests for renderer behavior, preload APIs, and utility helpers when fixing bugs. Run `npm test` before opening a PR; use `npm run test:coverage` for larger refactors.
 ## Commit & Pull Request Guidelines
 Recent history follows Conventional Commit prefixes such as `feat:`, `fix:`, and `refactor:`. Keep subjects short and imperative, for example `fix: guard modal cleanup on close`. PRs should describe the user-visible change, note test coverage, link any related issue, and include screenshots or GIFs for UI changes.
 ## Security & Configuration Tips
 Do not bypass preload boundaries or introduce direct `eval`/dynamic code paths; ESLint already treats these as errors. Export and conversion features depend on external tools such as Pandoc, FFmpeg, ImageMagick, and LibreOffice, so document any new runtime dependency in `README.md` and packaging config.
@@ -1,156 +1,162 @@
-# MarkdownConverter
+# PanConverter
-A powerful cross-platform Markdown editor and document converter powered by Pandoc, built with Electron. 100% open-source with no proprietary dependencies.
+A cross-platform Markdown editor and converter powered by Pandoc.
 ![PanConverter](assets/icon.png)
 ## Features
-### Markdown Editor
+### ✨ Advanced Markdown Editor
-<img width="1920" height="1032" alt="image" src="https://github.com/user-attachments/assets/5f53ba94-7663-47c3-b12b-b7b8bd2645aa" />
+- 🗂️ **Tabbed Interface** - Work with multiple files simultaneously in separate tabs
- **Multi-tab editing** - Work on multiple files simultaneously
+- 📝 **Rich Text Editor** - Full-featured editor with syntax highlighting and comprehensive toolbar
- **Live preview** - Real-time markdown rendering with syntax highlighting
+- 🔍 **Find & Replace** - Powerful search and replace with match highlighting and navigation
- **Dynamic splitter** - Drag to resize editor and preview panes
+- 🔢 **Line Numbers** - Toggle line numbers for easier code editing and navigation
- **25+ themes** - Light and dark themes including Atom One Light, Dracula, Nord, Sepia, and more
+- ↩️ **Smart Auto-Indentation** - Automatic list continuation and intelligent indentation
- **Find & Replace** - Search and replace with regex support
+- ⏪ **Undo/Redo** - Full undo/redo support with keyboard shortcuts
- **Line numbers** - Toggle line numbers in the editor
+- ⌨️ **Advanced Shortcuts** - Tab indentation, line selection, and smart text formatting
- **Auto-save** - Automatic saving every 30 seconds
+- 📂 **File Association Support** - Open markdown files directly from file manager
 - **Math support** - KaTeX integration for mathematical expressions
-### PDF Viewer & Editor
+### 🎨 Themes & Interface
-<img width="1920" height="1032" alt="image" src="https://github.com/user-attachments/assets/f10f62be-af3d-496e-81df-37ab4f91abfd" />
+- 👁️ **Live Preview** - See your markdown rendered in real-time with synchronized scrolling
 - 🎨 **Multiple Themes** - Choose from Light, Dark, Solarized, Monokai, or GitHub themes
 - 💾 **Auto-Save** - Never lose your work with automatic saving every 30 seconds
 - 📊 **Enhanced Statistics** - Detailed document statistics including word count, character count, lines, paragraphs, sentences, and estimated reading time
 - 🕒 **Recent Files** - Quick access to recently opened files via File menu
 - 🧮 **Math Support** - Render mathematical expressions using KaTeX (supports $$, $, \\[\\], \\(\\) delimiters)
- **Built-in PDF viewer** - Open and view PDF files directly in the app
+### 📤 Export & Conversion
- **Page navigation** - Navigate pages with keyboard or buttons
+- 📄 **Enhanced PDF Export** - Robust PDF generation with multiple LaTeX engine fallbacks (XeLaTeX, PDFLaTeX, wkhtmltopdf)
- **Zoom controls** - Zoom in/out, fit to width, fit to page
+- 📄 **Document Export** - Convert to HTML, DOCX, LaTeX, RTF, ODT, EPUB, PowerPoint (PPTX), and OpenDocument Presentation (ODP)
- **Rotation** - Rotate pages left or right
+- 📊 **Spreadsheet Export** - Export markdown tables to CSV format for compatibility with any spreadsheet application
- **PDF Editor tools**:
+- 📥 **Document Import** - Import DOCX, ODT, RTF, HTML, PDF, and presentation files to markdown
-  - Merge multiple PDFs
+- 📋 **Table Creation Helper** - Built-in table generator for easy markdown table creation
  - Split PDFs by page range
  - Compress PDFs
  - Rotate pages
  - Delete pages
  - Reorder pages
  - Add watermarks
  - Password protection
  - Remove passwords
  - Set permissions
-### Export Options
+### 🖥️ Platform Support
- **PDF** - Export to PDF with customizable page sizes and orientation
+- **Cross-Platform** - Works seamlessly on Windows, macOS, and Linux
 - **DOCX** - Standard and Enhanced (template-based) Word export
 - **ODT** - OpenDocument format
 - **HTML** - Web-ready HTML export
 - **PowerPoint** - PPTX presentation export
 - **EPUB** - E-book format
 - **LaTeX** - Academic document format
 - **RTF** - Rich Text Format
 ### Advanced Features
 - **Custom headers & footers** - Add headers/footers to exports with dynamic fields
 - **Page size configuration** - A3, A4, A5, B4, B5, Letter, Legal, Tabloid, or custom sizes
 - **Batch conversion** - Convert entire folders of markdown files
 - **ASCII Art Generator** - Create text banners and diagrams
 - **Word templates** - Use custom Word templates for enhanced exports
 - **Import documents** - Import from 30+ formats (DOCX, PDF, HTML, etc.)
 ## Installation
 ### Prerequisites
- [Node.js](https://nodejs.org/) (v16 or later)
+- [Pandoc](https://pandoc.org/installing.html) must be installed for export functionality
- [Pandoc](https://pandoc.org/installing.html) (required for export functionality)
+  - **Ubuntu/Debian**: `sudo apt-get install pandoc`
  - **macOS**: `brew install pandoc`
  - **Windows**: Download installer from Pandoc website
-### Install Dependencies
+### PDF Export Requirements
 For optimal PDF export, install a LaTeX engine (recommended):
 - **Ubuntu/Debian**: `sudo apt-get install texlive-xetex texlive-latex-base`
 - **macOS**: `brew install --cask mactex`
 - **Windows**: Install MiKTeX or TeX Live
 - **Alternative**: `sudo apt-get install wkhtmltopdf` (fallback option)
 ### Download
 Download the latest release for your platform from the [Releases](https://github.com/amitwh/pan-converter/releases) page.
 #### Linux
 - **AppImage**: `PanConverter-1.5.0.AppImage` (universal, may require `--no-sandbox` flag)
 - **Debian Package**: `pan-converter_1.5.6_amd64.deb`
 - **Snap Package**: `pan-converter_1.5.6_amd64.snap`
 ### Install from Source
 ```bash
 git clone https://github.com/amitwh/pan-converter.git
 cd pan-converter
 npm install
 ```
 ### Run the Application
 ```bash
 npm start
 ```
-### Build for Distribution
+## Usage
 ```bash
 # Windows
 npm run build:win
-# macOS
+### Basic Workflow
-npm run build:mac
+1. **Write** - Use the editor to write your Markdown content
 2. **Preview** - Toggle the preview pane to see rendered output
 3. **Theme** - Choose your preferred theme from the View menu
 4. **Export** - Export your document to various formats
-# Linux
+### Export Options
-npm run build:linux
+- **Documents**: HTML, PDF, DOCX, LaTeX, RTF, ODT, EPUB
-```
+- **Presentations**: PowerPoint (PPTX), OpenDocument Presentation (ODP)
 - **Spreadsheets**: CSV format for tables (compatible with Excel, LibreOffice, Google Sheets)
 - **Advanced Export Options**: Optional template support, metadata insertion, table of contents, section numbering, and PDF-specific settings
 - **Batch Conversion**: Convert entire folders of markdown files with progress tracking
 ### Import & Conversion
 - **Import Documents**: Convert DOCX, ODT, RTF, HTML, PDF, and presentation files to Markdown
 - **Cross-Format Conversion**: Convert current file between multiple formats
 - **Smart Presentation Handling**: Automatic slide-level formatting for PPTX/ODP exports
 ### Table Creation
 - Click the table button in the toolbar
 - Specify number of rows and columns
 - Automatically generates properly formatted Markdown tables
 ## Keyboard Shortcuts
-| Action | Shortcut |
+### File Operations
-|--------|----------|
+- `Ctrl/Cmd + N` - New file/tab
-| New File | Ctrl+N |
+- `Ctrl/Cmd + T` - New tab
-| Open File | Ctrl+O |
+- `Ctrl/Cmd + W` - Close current tab
-| Open PDF | Ctrl+Shift+O |
+- `Ctrl/Cmd + Tab` - Switch to next tab
-| Save | Ctrl+S |
+- `Ctrl/Cmd + O` - Open file
-| Save As | Ctrl+Shift+S |
+- `Ctrl/Cmd + S` - Save file
-| Export | Ctrl+E |
+- `Ctrl/Cmd + Shift + S` - Save as
-| Print | Ctrl+P |
+- `Ctrl/Cmd + I` - Import document
 | Find | Ctrl+F |
 | Undo | Ctrl+Z |
 | Redo | Ctrl+Shift+Z |
 | New Tab | Ctrl+T |
 | Close Tab | Ctrl+W |
 | Toggle Preview | Ctrl+Shift+P |
 | Zoom In | Ctrl+Shift++ |
 | Zoom Out | Ctrl+Shift+- |
-## Themes
+### Editor Features
 - `Ctrl/Cmd + F` - Find & Replace
 - `Ctrl/Cmd + Z` - Undo
 - `Ctrl/Cmd + Shift + Z` - Redo
 - `Tab` - Indent lines or insert 4 spaces
 - `Shift + Tab` - Outdent selected lines
 - `Enter` - Auto-continue lists with proper indentation
-### Light Themes
+### View & Navigation
- Atom One Light (Default)
+- `Ctrl/Cmd + P` - Toggle preview
- GitHub Light
+- `Ctrl/Cmd + Enter` - Toggle preview (alternative)
- Light
+- `Escape` - Close find dialog
 - Solarized Light
 - Gruvbox Light
 - Ayu Light
 - Sepia
 - Paper
 - Rose Pine Dawn
 - Concrete Light
-### Dark Themes
+## Building
 - Dark
 - One Dark
 - Dracula
 - Nord
 - Monokai
 - Material
 - Gruvbox Dark
 - Tokyo Night
 - Palenight
 - Ayu Dark
 - Ayu Mirage
 - Oceanic Next
 - Cobalt2
 - Concrete Dark
 - Concrete Warm
-## PDF Viewer
+```bash
 # Install dependencies
 npm install
-Open PDF files directly in MarkdownConverter:
+# Generate icons
- **File > Open PDF** or **Ctrl+Shift+O**
+npm run generate-icons
 - Navigate pages with arrow buttons or page input
 - Zoom controls: +/- buttons, Fit Width, Fit Page
 - Rotate pages left or right
 - Close PDF to return to editor
-## Open Source
+# Build for current platform
 npm run build
-MarkdownConverter is 100% open-source. All dependencies are permissively licensed:
+# Build for specific platform
- **Electron** - MIT License
+npm run build:win    # Windows
- **pdf-lib** - MIT License
+npm run build:mac    # macOS  
- **pdfjs-dist** - Apache 2.0 License
+npm run build:linux  # Linux (generates .deb, .AppImage, and .snap)
- **marked** - MIT License
+
- **highlight.js** - BSD 3-Clause License
+# Build for all platforms
- **dompurify** - Apache 2.0/MIT License
+npm run dist:all
- **docx** - MIT License
+```
- **xlsx** - Apache 2.0 License (SheetJS Community Edition)
+
 ## Version History
 - **v1.8.0** - Added enhanced Word export with template support to batch converter
 - **v1.7.9** - Enhanced Word Export with Template Support: Template-based DOCX generation with custom templates, table styling, ASCII art support, and red-colored flowchart arrows
 - **v1.5.6** - (Your release notes here)
 - **v1.5.5** - Refactored PDF export, simplified Pandoc pathing, and removed XLSX dependency.
 - **v1.3.1** - Bug fixes: Fixed file associations for double-clicking .md files, corrected 50/50 layout alignment for editor/preview panes
 - **v1.3.0** - Major update: Tabbed interface for multiple files, enhanced PDF export with LaTeX engines, fixed file associations, removed redundant converter menu, improved UI architecture
 - **v1.2.1** - Comprehensive editor enhancements: Find & Replace, Line Numbers, Undo/Redo, Auto-indentation, PowerPoint export, document conversion menu, table creation helper, spreadsheet export
 - **v1.1.0** - Added Excel/ODS spreadsheet export, updated author information, renamed to PanConverter
 - **v1.0.0** - Initial release with basic markdown editing, themes, and Pandoc export
 ## Known Issues
 - AppImage may require `--no-sandbox` flag on some Linux systems
 - Windows/Mac builds require platform-specific build environments
 - Large files may cause performance issues
 ## Contributing
 Contributions are welcome! Please feel free to submit a Pull Request to the [GitHub repository](https://github.com/amitwh/pan-converter).
 ## License
@@ -158,8 +164,13 @@ MIT License - see LICENSE file for details.
 ## Author
-Amit Haridas (amit.wh@gmail.com)
+**Amit Haridas** - [amit.wh@gmail.com](mailto:amit.wh@gmail.com)
-## Version
+## Acknowledgments
-v4.1.0
+- Built with [Electron](https://www.electronjs.org/)
 - Markdown parsing by [marked](https://marked.js.org/)
 - Export functionality powered by [Pandoc](https://pandoc.org/)
 - Syntax highlighting by [highlight.js](https://highlightjs.org/)
 - Spreadsheet export by [XLSX](https://www.npmjs.com/package/xlsx)
 - HTML sanitization by [DOMPurify](https://www.npmjs.com/package/dompurify)
@@ -1,217 +0,0 @@
 # PanConverter - Updates & Changelog
 ## Version 4.0.0 (2026-03-04)
 ### Major Changes
 - **CodeMirror 6 Editor** — Replaced textarea with CodeMirror 6 featuring syntax highlighting, code folding, bracket matching, multiple cursors, and auto-indent
 - **Sidebar Panel System** — Collapsible sidebar with File Explorer, Git, Snippets, and Templates panels
 - **Command Palette** — Ctrl+Shift+P to search and execute all app actions
 - **Code Execution (REPL)** — Run JavaScript, Python, and Bash code blocks directly from the preview
 ### New Features
 - Print Preview dialog with paper size, orientation, margins, scale, and page range controls
 - Image paste from clipboard and drag-drop support with auto-save to assets folder
 - Document templates library (10 templates: blog post, meeting notes, tech spec, changelog, README, project plan, API docs, tutorial, release notes, comparison)
 - Markdown extensions: footnotes, admonitions (note/warning/tip/danger/info), and [[toc]] table of contents
 - PlantUML diagram rendering alongside Mermaid
 - Welcome tab with onboarding and "What's New" feature showcase
 - System spell checking with context menu suggestions and dictionary support
 - Enhanced status bar with word count, character count, line/column, encoding, and language mode
 - Grouped toolbar with visual section separators
 - Breadcrumb bar showing current file path
 ### New Export/Import Formats
 - Reveal.js slides (.html)
 - Beamer slides (.pdf)
 - Confluence/Jira wiki markup (.txt)
 - MOBI e-books (via Calibre)
 - Developer formats: JSON, YAML, XML, TOML
 ### Security
 - Content Security Policy (CSP) meta tag
 - File size validation (50MB limit)
 - Error message sanitization (stripped file paths)
 - Conversion rate limiting (2-second debounce)
 ### Dependencies Updated
 - marked: 16.x to 17.x (with marked-highlight extension)
 - pdfjs-dist: 3.x to 5.x (new worker model)
 - html2pdf.js: 0.10 to 0.14
 - pdfkit: 0.14 to 0.17
 - dompurify, docx, and others updated to latest
 ### Testing
 - 80 tests across 7 test suites
 - New tests for sidebar manager, command palette, print preview, markdown extensions, and utility functions
 ### Breaking Changes
 - Editor is now CodeMirror 6 (replaces textarea)
 - marked API changed to use marked.use() instead of marked.setOptions()
 - pdfjs-dist upgraded to v5 with new worker model
 ---
 ## Version 2.1.0 (December 14, 2025)
 ### 🎨 UI/UX Improvements
 #### Subtle & Small Preview Popout Button
 - Redesigned popout button with minimalist aesthetic
 - Removed border for cleaner appearance
 - Reduced size: 11px font, 2px×6px padding (previously 14px font, 4px×8px padding)
 - Added opacity transition: 50% when idle, 100% on hover
 - Subtle background effect on hover instead of heavy border styling
 - **File**: `src/styles.css:195-211`
 #### Simplified Table Headers in Preview
 - Removed gradient background from table headers in modern theme
 - Changed from `var(--primary-gradient)` (purple gradient) to simple light gray (#f0f0f0)
 - Updated text color to dark (#333333) for better readability
 - Clean, professional appearance matching standard themes
 - **File**: `src/styles-modern.css:445-449`
 ### 📥 Enhanced Import Capabilities
 #### Comprehensive Format-to-Markdown Conversion
 Dramatically expanded the "Import Document" feature to support 30+ file formats:
 **Supported Formats:**
 - **Documents**: DOCX, ODT, RTF, HTML, HTM, TEX, EPUB, PDF, TXT
 - **Presentations**: PPTX, ODP
 - **Markup Languages**: RST, Textile, MediaWiki, Org-mode, AsciiDoc, TWiki, OPML
 - **E-book Formats**: EPUB, FB2
 - **LaTeX Formats**: TEX, LATEX, LTX
 - **Web Formats**: HTML, HTM, XHTML
 - **Wiki Formats**: MediaWiki, DokuWiki, TikiWiki, TWiki
 - **Data Formats**: CSV, TSV, JSON
 **Format-Specific Optimizations:**
 - PDF text extraction with XeLaTeX engine
 - CSV/TSV automatic table conversion
 - JSON structure handling
 - Improved error messages with format hints
 **Access**: File → Import Document (Ctrl+I)
 **File**: `src/main.js:1933-1994`
 ### 🎨 Exhaustive ASCII Art Generator
 #### 5 New Text Banner Styles
 Complete alphabet (A-Z) and numbers (0-9) support for all styles:
 1. **Standard** - Classic ASCII art with slashes and underscores
 2. **Banner** - Large format using # characters (7-line height)
 3. **Block** - Modern Unicode block characters (█ ╔ ╗ ═ ║)
 4. **Bubble** - Circular bubble letters (Ⓐ Ⓑ Ⓒ)
 5. **Digital** - Digital display style (▄ ▀ ▐ ▌)
 **File**: `src/renderer.js:3397-3537`
 #### 19 Professional ASCII Templates
 Organized into 4 categories with expanded options:
 **Arrows & Flow (4 templates):**
 - Arrow Right - Horizontal flow indicators
 - Arrow Down - Vertical flow indicators
 - Decision - Binary decision diagrams
 - Process Flow - Multi-step process visualization
 **Diagrams & Charts (6 templates):**
 - Flowchart - Advanced flowchart with decision branches and loops
 - Sequence - Sequence diagrams for User-System-Database interactions
 - Network - Server-client network topology
 - Hierarchy - Organizational tree structures
 - Timeline - Milestone visualization with dates
 - Table Simple - Basic table template with borders
 **Boxes & Containers (4 templates):**
 - Header - Section header with decorative borders
 - Note Box - Important notes with rounded corners (┏━━┓)
 - Warning Box - Warning messages with bold borders (╔═══╗)
 - Info Box - Information boxes with subtle styling (╭───╮)
 **Decorative Elements (6 templates):**
 - Divider - Horizontal section separator (═══)
 - Separator Fancy - Elegant rounded divider
 - Brackets - Japanese-style brackets 【 】
 - Banner Stars - Star-bordered banners
 - Checklist - Task lists with ✓ checkmarks
 - Progress Bar - Visual progress indicators
 **Features:**
 - All ASCII art automatically wrapped in code blocks for proper rendering
 - Preserved formatting in markdown preview and all export formats
 - Categorized template selection interface
 - Real-time preview generation
 **Access**: Tools → ASCII Art Generator
 **Files**: `src/renderer.js:3513-3671`, `src/index.html:427-466`
 ### 📝 Technical Improvements
 - Enhanced ASCII art detection in Word template exporter
 - Improved monospace font rendering across all export formats
 - Better code block preservation in PDF and Word exports
 - Optimized template categorization and organization
 ### 🔧 Files Modified
 - `src/styles.css` - Preview popout button styling
 - `src/styles-modern.css` - Table header simplification
 - `src/main.js` - Enhanced import function, version update
 - `src/renderer.js` - ASCII art generator enhancements
 - `src/index.html` - ASCII template UI organization
 - `package.json` - Version bump to 2.1.0
 ---
 ## Version 2.0.0 (Previous Release)
 ### Major Features
 - Export Profiles - Save and reuse export configurations
 - Mermaid.js diagram support
 - Command Palette (Ctrl+Shift+P)
 - GitHub Light/Dark preview themes
 - Table Generator
 - ASCII Art Generator (basic)
 - Resizable Preview Pane
 - Pop-out Preview Window
 - Configurable page sizes (A3-A5, B4-B5, Letter, Legal, Tabloid, Custom)
 - Custom Headers & Footers for exports
 - Enhanced PDF and Word export with templates
 - 22 beautiful themes
 ### Core Capabilities
 - Cross-platform markdown editor with live preview
 - Universal document conversion (30+ formats)
 - PDF Editor (merge, split, compress, rotate, watermark, encrypt)
 - Batch file conversion
 - File association support
 - Advanced export options
 - Multi-tab interface
 ---
 ## Installation & Usage
 ### Prerequisites
 - **Pandoc** - Required for document conversion
 - **Optional**: LibreOffice, ImageMagick, FFmpeg for universal converter
 ### Download
 Get the latest release from: https://github.com/amitwh/pan-converter/releases
 ### Supported Platforms
 - Windows (x64)
 - Linux (AppImage, .deb, .snap)
 - macOS (planned)
 ---
 ## Contributing
 Contributions are welcome! Please see [CLAUDE.md](CLAUDE.md) for development guidelines.
 **Author**: Amit Haridas (amit.wh@gmail.com)
 **License**: MIT
 **Repository**: https://github.com/amitwh/pan-converter
@@ -0,0 +1,8 @@
 <svg width="256" height="256" viewBox="0 0 256 256" xmlns="http://www.w3.org/2000/svg">
  <rect width="256" height="256" rx="32" fill="#4A90E2"/>
  <g transform="translate(40, 40)">
    <path d="M20 40 L20 136 L80 136 L80 100 L56 100 L56 76 L80 76 L80 40 Z" fill="white" opacity="0.9"/>
    <path d="M96 40 L96 136 L156 136 L156 100 L132 100 L132 88 L156 88 L156 52 L132 52 L132 40 Z" fill="white" opacity="0.9"/>
  </g>
  <text x="128" y="200" font-family="Arial, sans-serif" font-size="24" font-weight="bold" text-anchor="middle" fill="white">PAN</text>
 </svg>
@@ -1,866 +0,0 @@
 # MarkdownConverter - STRIDE Threat Model Analysis
 **Version:** 4.1.0
 **Date:** 2026-03-15
 **Methodology:** STRIDE + MITRE ATT&CK Mapping
 **Analyst:** Security Assessment Team
 ---
 ## Executive Summary
 This threat model analyzes the MarkdownConverter Electron application using the STRIDE methodology. The assessment identified **10 critical vulnerabilities** with CVSS scores ranging from 3.5 to 9.6. The most severe threats involve insecure Electron configuration (CVE-MC-001) and arbitrary code execution via REPL (CVE-MC-002), which could allow complete system compromise.
 **Risk Summary:**
 | Severity | Count | Total CVSS Impact |
 |----------|-------|-------------------|
 | Critical (9.0+) | 2 | 18.9 |
 | High (7.0-8.9) | 3 | 23.3 |
 | Medium (5.0-6.9) | 3 | 17.3 |
 | Low (<5.0) | 2 | 7.9 |
 ---
 ## 1. System Architecture Overview
 ### 1.1 Application Components
 ```
 +------------------------------------------------------------------+
 |                    MarkdownConverter v4.0.0                       |
 +------------------------------------------------------------------+
 |                                                                   |
 |  +------------------+     +------------------+                    |
 |  |   Main Process   |<--->|  Renderer Process|                    |
 |  |    (Node.js)     |     |   (Chromium)     |                    |
 |  +------------------+     +------------------+                    |
 |          |                        |                               |
 |          | IPC Channels           |                               |
 |          v                        v                               |
 |  +------------------+     +------------------+                    |
 |  |   preload.js     |     |   renderer.js    |                    |
 |  | (Bridge Layer)   |     | (UI Logic)       |                    |
 |  +------------------+     +------------------+                    |
 |          |                        |                               |
 |          v                        v                               |
 |  +--------------------------------------------------+             |
 |  |              External Tools                       |             |
 |  | Pandoc | FFmpeg | ImageMagick | LibreOffice      |             |
 |  +--------------------------------------------------+             |
 |                                                                   |
 +------------------------------------------------------------------+
                              |
                              v
 +------------------------------------------------------------------+
 |                    External Services                              |
 |  - plantuml.com (diagram rendering)                              |
 |  - cdn.jsdelivr.net (scripts)                                    |
 |  - cdnjs.cloudflare.com (styles)                                 |
 +------------------------------------------------------------------+
 ```
 ### 1.2 Data Flow Diagram (Level 1)
 ```
                              TRUST BOUNDARY
                                    |
    +-----------+                   |                   +-----------+
    |   User    |                   |                   |  System   |
    | (Author)  |------------------>|------------------>|   Files   |
    +-----------+   Markdown        |   File I/O        +-----------+
                    Content         |
                                    |
                    +---------------+---------------+
                    |                               |
                    v                               v
            +---------------+               +---------------+
            |    Editor     |               |   Preview     |
            | (CodeMirror)  |               |  (Rendered)   |
            +---------------+               +---------------+
                    |                               ^
                    |    Sanitization               |
                    |    (DOMPurify)                |
                    v                               |
            +---------------+                       |
            |   Renderer    |-----------------------+
            |   Process     |  HTML/SVG
            +---------------+
                    |
                    | IPC (Whitelisted Channels)
                    v
            +---------------+               +-----------+
            |    Main       |-------------->|  Pandoc   |
            |   Process     |  execFile     |  FFmpeg   |
            |   (Node.js)   |               |  etc.     |
            +---------------+               +-----------+
                    |
                    | HTTPS
                    v
            +---------------+
            |  PlantUML     |
            |  Server       |
            | (External)    |
            +---------------+
 ```
 ### 1.3 Trust Boundaries
 ```
 +============================================================================+
 ||                     TRUST BOUNDARY 1: User <-> Application               ||
 ||  - User input (markdown content) is UNTRUSTED                            ||
 ||  - File paths from dialogs are PARTIALLY TRUSTED                         ||
 +============================================================================+
                                    |
                                    v
 +============================================================================+
 ||                     TRUST BOUNDARY 2: Renderer <-> Main Process          ||
 ||  - IPC communication via preload.js                                       ||
 ||  - CRITICAL: nodeIntegration=true bypasses isolation                      ||
 +============================================================================+
                                    |
                                    v
 +============================================================================+
 ||                     TRUST BOUNDARY 3: Application <-> System             ||
 ||  - External tool execution (Pandoc, FFmpeg, etc.)                         ||
 ||  - File system access                                                     ||
 +============================================================================+
                                    |
                                    v
 +============================================================================+
 ||                     TRUST BOUNDARY 4: Application <-> Internet           ||
 ||  - PlantUML server (https://www.plantuml.com)                            ||
 ||  - CDN resources (jsdelivr, cdnjs)                                        ||
 +============================================================================+
 ```
 ---
 ## 2. STRIDE Analysis
 ### 2.1 Spoofing
 | ID | Threat | Description | CVE | CVSS |
 |----|--------|-------------|-----|------|
 | S-01 | **PlantUML Server Spoofing** | Application sends diagram content to external PlantUML server. MITM or compromised server could return malicious SVG content. | CVE-MC-007 | 5.3 |
 | S-02 | **CDN Compromise** | Scripts loaded from cdn.jsdelivr.net and styles from cdnjs.cloudflare.com could be compromised in supply chain attack. | - | 6.5 |
 **Attack Tree - S-01 PlantUML Data Exfiltration:**
 ```
 GOAL: Exfiltrate sensitive data via PlantUML rendering
 │
 ├── [1] Intercept network traffic (MITM)
 │   ├── [1.1] Exploit weak TLS implementation
 │   └── [1.1] DNS hijacking
 │
 ├── [2] Compromise PlantUML server
 │   ├── [2.1] Server breach
 │   └── [2.2] Supply chain compromise
 │
 └── [3] Inject malicious SVG response
    ├── [3.1] XSS via SVG onload
    └── [3.2] Data exfiltration via image src
 ```
 ### 2.2 Tampering
 | ID | Threat | Description | CVE | CVSS |
 |----|--------|-------------|-----|------|
 | T-01 | **Markdown Content Tampering** | XSS in markdown rendering could modify rendered content or inject malicious scripts. | CVE-MC-003 | 8.0 |
 | T-02 | **File Tampering via Path Traversal** | Missing path validation could allow writing to arbitrary locations. | CVE-MC-004 | 7.8 |
 | T-03 | **REPL Code Injection** | Arbitrary code execution via REPL feature allows system modification. | CVE-MC-002 | 9.3 |
 **Attack Tree - T-03 REPL Code Injection:**
 ```
 GOAL: Achieve arbitrary code execution via REPL
 │
 ├── [1] User opens malicious markdown file
 │   ├── [1.1] Phishing/social engineering
 │   └── [1.2] Malicious file from untrusted source
 │
 ├── [2] Malicious code block rendered in preview
 │   ├── [2.1] JavaScript code block
 │   ├── [2.2] Python code block
 │   └── [2.3] Bash/Shell code block
 │
 ├── [3] User clicks "Run" button
 │
 └── [4] Code executed on main process
    ├── [4.1] File system access
    ├── [4.2] Process execution
    └── [4.3] Network access
        └── [4.3.1] Data exfiltration
        └── [4.3.2] C2 communication
 ```
 ### 2.3 Repudiation
 | ID | Threat | Description | CVE | CVSS |
 |----|--------|-------------|-----|------|
 | R-01 | **Missing Audit Logging** | No logging of security-relevant events (file access, code execution, exports). | - | 4.0 |
 | R-02 | **REPL Execution No Audit Trail** | Code executed via REPL leaves no persistent audit log. | CVE-MC-002 | 5.0 |
 ### 2.4 Information Disclosure
 | ID | Threat | Description | CVE | CVSS |
 |----|--------|-------------|-----|------|
 | I-01 | **Path Disclosure in Error Messages** | Error messages may expose absolute file paths. Partially mitigated by `sanitizeErrorMessage()`. | - | 4.5 |
 | I-02 | **PlantUML Data Leakage** | Diagram content sent to external server could contain sensitive information. | CVE-MC-007 | 5.3 |
 | I-03 | **CSP Allows External Connections** | Weak CSP allows data exfiltration via `connect-src 'self' https://www.plantuml.com`. | CVE-MC-005 | 7.5 |
 **Data Flow - Information Disclosure via PlantUML:**
 ```
 +-------------+     Encoded Diagram      +------------------+
 |  Renderer   | ----------------------> | www.plantuml.com |
 |  Process    |   (~h encoded)          |   (External)     |
 +-------------+                         +------------------+
       |                                        |
       | Sensitive data in diagram:             |
       | - Architecture details                 |
       | - Database schemas                     |
       | - API endpoints                        |
       | - Class names/relationships            |
       v                                        v
 +-------------+                         +-------------+
 |  Attacker   | <--- Network Capture -- |  Network    |
 |  (MITM)     |                         |  Traffic    |
 +-------------+                         +-------------+
 ```
 ### 2.5 Denial of Service
 | ID | Threat | Description | CVE | CVSS |
 |----|--------|-------------|-----|------|
 | D-01 | **REPL Resource Exhaustion** | Code execution has 10s timeout but could consume CPU/memory. | CVE-MC-002 | 4.5 |
 | D-02 | **Large File Processing** | Files up to 50MB allowed, could cause memory exhaustion during conversion. | - | 5.0 |
 | D-03 | **Infinite Loop in Markdown** | Malicious markdown could cause rendering loops. | - | 4.0 |
 ### 2.6 Elevation of Privilege
 | ID | Threat | Description | CVE | CVSS |
 |----|--------|-------------|-----|------|
 | E-01 | **Insecure Electron Configuration** | `nodeIntegration: true` + `contextIsolation: false` allows full Node.js access from renderer. | CVE-MC-001 | 9.6 |
 | E-02 | **XSS to RCE Chain** | XSS vulnerability combined with E-01 enables remote code execution. | CVE-MC-003 + CVE-MC-001 | 9.8 |
 | E-03 | **External Tool Command Injection** | While using `execFile`, improper input validation could still pose risks. | CVE-MC-009 | 4.4 |
 | E-04 | **Inconsistent Window Security** | PDF export windows use insecure settings (nodeIntegration: true). | CVE-MC-006 | 6.5 |
 **Attack Tree - E-01/E-02 XSS to RCE Chain:**
 ```
 GOAL: Remote Code Execution via XSS -> RCE Chain
 │
 ├── [1] Inject malicious script (XSS)
 │   ├── [1.1] Via malicious markdown file
 │   │   ├── HTML injection
 │   │   ├── SVG with script
 │   │   └── DOMPurify bypass
 │   │
 │   └── [1.2] Via PlantUML SVG response
 │       └── Compromised server returns malicious SVG
 │
 ├── [2] Execute in renderer context
 │   └── [2.1] Script runs with nodeIntegration=true
 │       ├── Direct require() access
 │       ├── child_process.exec()
 │       └── fs module access
 │
 └── [3] Achieve RCE
    ├── [3.1] Execute system commands
    ├── [3.2] Read/write arbitrary files
    ├── [3.3] Install persistence mechanisms
    └── [3.4] Lateral movement
 ```
 ---
 ## 3. Attack Scenarios
 ### 3.1 Scenario: Malicious Markdown Document (Critical)
 **Attack Chain:**
 ```
 1. Attacker creates malicious.md containing:
   - Embedded JavaScript in markdown
   - Malicious code blocks (JavaScript/Python/Bash)
 2. Victim opens file in MarkdownConverter
 3. XSS payload executes due to:
   - CVE-MC-003: Potential XSS in markdown rendering
   - CVE-MC-001: nodeIntegration=true allows Node.js access
 4. Payload executes system commands:
   - Exfiltrates sensitive files
   - Installs backdoor
   - Establishes persistence
 5. Impact: Complete system compromise
 ```
 **MITRE ATT&CK Mapping:**
 | Tactic | Technique | ID | Description |
 |--------|-----------|-----|-------------|
 | Initial Access | Phishing | T1566 | Malicious file via email |
 | Execution | User Execution | T1204 | Victim opens malicious file |
 | Execution | Command/Scripting | T1059 | JavaScript/Python execution |
 | Persistence | Registry Run Keys | T1547 | Establish persistence |
 | Collection | Data from Local System | T1005 | File exfiltration |
 | Exfiltration | Exfiltration Over C2 | T1041 | Data sent to attacker |
 ### 3.2 Scenario: REPL Code Execution (Critical)
 **Attack Chain:**
 ```
 1. Social engineering: Attacker convinces user to:
   - Open a "configuration guide" markdown file
   - Run the code examples to "verify setup"
 2. Markdown contains malicious code blocks:
   ```javascript
   const fs = require('fs');
   const https = require('https');
   // Exfiltrate SSH keys
   ```
 3. User clicks "Run" button on code block
 4. Code executes via 'execute-code' IPC handler:
   - CVE-MC-002: Arbitrary code execution via REPL
   - No sandboxing or permission checks
 5. Impact: Credential theft, data exfiltration
 ```
 **MITRE ATT&CK Mapping:**
 | Tactic | Technique | ID | Description |
 |--------|-----------|-----|-------------|
 | Initial Access | Phishing | T1566 | Social engineering |
 | Execution | Command/Scripting | T1059.004 | Bash execution |
 | Execution | Command/Scripting | T1059.007 | JavaScript/Node execution |
 | Credential Access | Credentials from Files | T1083 | SSH key theft |
 | Exfiltration | Exfiltration Over Web Service | T1567 | HTTPS exfiltration |
 ### 3.3 Scenario: PlantUML Data Exfiltration (Medium)
 **Attack Chain:**
 ```
 1. User creates architecture diagram in PlantUML:
   - Contains sensitive system design
   - Database schemas
   - API endpoints
 2. Renderer encodes and sends to www.plantuml.com:
   - CVE-MC-007: Data sent to external server
 3. Attacker (MITM or compromised server):
   - Captures diagram content
   - Extracts sensitive information
 4. Impact: Intellectual property theft, reconnaissance
 ```
 ### 3.4 Scenario: PDF Export Window Exploitation (Medium)
 **Attack Chain:**
 ```
 1. User exports document to PDF
 2. Hidden PDF export window created with:
   - CVE-MC-006: nodeIntegration: true
   - CVE-MC-008: contextIsolation: false
 3. If malicious content in document:
   - Script execution in PDF window
   - Access to Node.js APIs
 4. Impact: Code execution during export process
 ```
 ---
 ## 4. Risk Matrix & Prioritization
 ### 4.1 Vulnerability Risk Matrix
 ```
                              IMPACT
                    Low         Medium         High          Critical
                  (1-3)        (4-6)          (7-8)          (9-10)
              +------------+------------+--------------+-------------+
    High      | CVE-MC-010 | CVE-MC-007 | CVE-MC-005   | CVE-MC-001  |
   (0.7-1.0)  |   3.5      |   5.3      |    7.5       |    9.6      |
              |  DEPENDENCY |  INFOSEC   |    CSP       |   CONFIG    |
              +------------+------------+--------------+-------------+
              |            | CVE-MC-006 | CVE-MC-003   | CVE-MC-002  |
 LIKELIHOOD    |            |   6.5      |    8.0       |    9.3      |
   (0.4-0.6)  |            |  PDF-WIN   |    XSS       |    REPL     |
              +------------+------------+--------------+-------------+
    Medium    |            | CVE-MC-008 | CVE-MC-004   |             |
   (0.2-0.4)  |            |   5.5      |    7.8       |             |
              |            |  INCONSIST |  PATH-TRAV   |             |
              +------------+------------+--------------+-------------+
    Low       |            |            | CVE-MC-009   |             |
   (0-0.2)    |            |            |    4.4       |             |
              |            |            |  CMD-EXEC    |             |
              +------------+------------+--------------+-------------+
 ```
 ### 4.2 Prioritized Remediation List
 | Priority | CVE | Vulnerability | CVSS | Effort | Risk Reduction |
 |----------|-----|---------------|------|--------|----------------|
 | P0 | CVE-MC-001 | Insecure Electron Config | 9.6 | Medium | Critical |
 | P0 | CVE-MC-002 | REPL Code Execution | 9.3 | High | Critical |
 | P1 | CVE-MC-003 | XSS in Markdown | 8.0 | Medium | High |
 | P1 | CVE-MC-004 | Path Traversal | 7.8 | Low | High |
 | P1 | CVE-MC-005 | Weak CSP | 7.5 | Medium | High |
 | P2 | CVE-MC-006 | PDF Window Config | 6.5 | Low | Medium |
 | P2 | CVE-MC-008 | Inconsistent Settings | 5.5 | Low | Medium |
 | P2 | CVE-MC-007 | PlantUML Exfiltration | 5.3 | Medium | Medium |
 | P3 | CVE-MC-009 | External Tool Execution | 4.4 | Low | Low |
 | P3 | CVE-MC-010 | Dependency Versioning | 3.5 | Low | Low |
 ### 4.3 Risk Score Calculation
 ```
 Overall Application Risk Score: 7.8 (HIGH)
 Calculation:
 - Weighted by exploitability and impact
 - P0 issues weighted 3x
 - P1 issues weighted 2x
 - P2 issues weighted 1x
 - P3 issues weighted 0.5x
 Risk = (9.6*3 + 9.3*3 + 8.0*2 + 7.8*2 + 7.5*2 + 6.5 + 5.5 + 5.3 + 4.4*0.5 + 3.5*0.5) / 17
     = (28.8 + 27.9 + 16.0 + 15.6 + 15.0 + 6.5 + 5.5 + 5.3 + 2.2 + 1.75) / 17
     = 124.55 / 17
     = 7.33 (adjusted to 7.8 with environmental factors)
 ```
 ---
 ## 5. Business Impact Analysis
 ### 5.1 Impact Categories
 | Category | Description | Affected CVEs | Impact Level |
 |----------|-------------|---------------|--------------|
 | **Data Confidentiality** | Unauthorized access to sensitive documents | CVE-MC-001,002,003,007 | Critical |
 | **Data Integrity** | Modification of documents or system files | CVE-MC-001,002,004 | Critical |
 | **System Availability** | Application or system unavailability | CVE-MC-002,009 | Medium |
 | **Compliance** | Regulatory violations (GDPR, HIPAA) | CVE-MC-001,002,007 | High |
 | **Reputation** | Trust damage from security incidents | All CVEs | High |
 | **Financial** | Direct costs from breaches | CVE-MC-001,002,003 | Critical |
 ### 5.2 Business Impact by Attack Type
 #### Complete System Compromise (CVE-MC-001 + CVE-MC-002)
 ```
 Financial Impact:
 - Incident response: $50,000 - $200,000
 - Data breach notification: $100,000+
 - Regulatory fines: Up to 4% annual revenue (GDPR)
 - Legal fees: $100,000 - $500,000
 - Business disruption: $10,000/day
 Reputational Impact:
 - Customer trust erosion
 - Market share loss
 - Brand damage
 Estimated Total: $500,000 - $5,000,000+
 ```
 #### Data Exfiltration via PlantUML (CVE-MC-007)
 ```
 Financial Impact:
 - Intellectual property theft
 - Competitive disadvantage
 - Remediation costs: $20,000 - $50,000
 Reputational Impact:
 - Customer concerns about data handling
 - Potential contract violations
 Estimated Total: $50,000 - $500,000
 ```
 #### XSS Attack (CVE-MC-003)
 ```
 Financial Impact:
 - Session hijacking remediation
 - Credential reset costs
 - Monitoring enhancement
 Estimated Total: $10,000 - $100,000
 ```
 ### 5.3 Risk Tolerance Matrix
 | Asset | Criticality | Current Risk | Tolerance | Gap |
 |-------|-------------|--------------|-----------|-----|
 | User Documents | High | Critical | Low | **HIGH** |
 | System Integrity | Critical | Critical | Very Low | **CRITICAL** |
 | User Credentials | Critical | High | Very Low | **HIGH** |
 | Application Availability | Medium | Medium | Medium | Low |
 | Network Communication | Medium | Medium | Low | Medium |
 ---
 ## 6. MITRE ATT&CK Framework Mapping
 ### 6.1 Complete Technique Mapping
 | Tactic | Technique | ID | CVE Reference | Detection | Mitigation |
 |--------|-----------|-----|---------------|-----------|------------|
 | **Initial Access** |
 | | Phishing | T1566 | CVE-MC-003 | Email filtering | User training |
 | | Valid Accounts | T1078 | N/A | Auth logging | MFA |
 | **Execution** |
 | | Command/Scripting Interpreter | T1059 | CVE-MC-002 | Process monitoring | Disable REPL |
 | | JavaScript | T1059.007 | CVE-MC-001,003 | CSP violations | Enable contextIsolation |
 | | Python | T1059.006 | CVE-MC-002 | Process monitoring | Sandboxing |
 | | Bash | T1059.004 | CVE-MC-002 | Process monitoring | Input validation |
 | **Persistence** |
 | | Registry Run Keys | T1547.001 | Post-CVE-MC-001 | Registry monitoring | Principle of least privilege |
 | | Scheduled Task | T1053 | Post-CVE-MC-001 | Task monitoring | Application hardening |
 | **Defense Evasion** |
 | | Obfuscated Files | T1027 | CVE-MC-003 | Content inspection | Strict CSP |
 | **Credential Access** |
 | | Credentials from Files | T1083 | CVE-MC-002 | File access monitoring | Isolate secrets |
 | **Discovery** |
 | | File and Directory Discovery | T1083 | CVE-MC-001,002 | File monitoring | Sandbox |
 | | System Information Discovery | T1082 | CVE-MC-002 | Process monitoring | Disable REPL |
 | **Collection** |
 | | Data from Local System | T1005 | CVE-MC-002 | DLP | Access controls |
 | **Command and Control** |
 | | Application Layer Protocol | T1071 | CVE-MC-007 | Network monitoring | Disable external services |
 | **Exfiltration** |
 | | Exfiltration Over Web Service | T1567 | CVE-MC-007 | Network monitoring | Block external connections |
 | | Exfiltration Over C2 | T1041 | Post-exploitation | EDR | Network segmentation |
 ### 6.2 Attack Flow Diagram
 ```
 +------------------+     +------------------+     +------------------+
 |   INITIAL        |     |   EXECUTION      |     |   PERSISTENCE    |
 |   ACCESS         |     |                  |     |                  |
 |                  |     |                  |     |                  |
 |  T1566 Phishing  |---->| T1059.007 JS     |---->| T1547.001 Reg    |
 |  T1204 User Exec |     | T1059.004 Bash   |     | T1053 Sched Task |
 |                  |     | T1059.006 Python |     |                  |
 +------------------+     +------------------+     +------------------+
                                |
                                v
 +------------------+     +------------------+     +------------------+
 |   COLLECTION     |<----|   DISCOVERY      |     |   C2             |
 |                  |     |                  |     |                  |
 | T1005 Local Data |     | T1083 File Disc  |     | T1071 HTTPS      |
 | T1083 Creds File |     | T1082 Sys Info   |     |                  |
 +------------------+     +------------------+     +------------------+
        |
        v
 +------------------+
 |   EXFILTRATION   |
 |                  |
 | T1567 Web Service|
 | T1041 Over C2    |
 +------------------+
 ```
 ---
 ## 7. Security Requirements & Mitigations
 ### 7.1 Critical Mitigations (P0)
 #### CVE-MC-001: Insecure Electron Configuration
 **Current State:**
 ```javascript
 // main.js:328-331
 webPreferences: {
  nodeIntegration: true,
  contextIsolation: false,
  spellcheck: true
 }
 ```
 **Required Changes:**
 ```javascript
 webPreferences: {
  nodeIntegration: false,      // REQUIRED
  contextIsolation: true,       // REQUIRED
  sandbox: true,                // RECOMMENDED
  spellcheck: true
 }
 ```
 **Migration Path:**
 1. Update preload.js to expose all required APIs
 2. Update renderer.js to use exposed APIs instead of require()
 3. Test all functionality
 4. Deploy in stages
 #### CVE-MC-002: REPL Code Execution
 **Mitigation Options:**
 | Option | Security | Usability | Effort |
 |--------|----------|-----------|--------|
 | Disable REPL entirely | Highest | None | Low |
 | Sandbox with restricted permissions | High | High | High |
 | Add execution confirmation dialog | Medium | High | Low |
 | Require admin password | Medium | Medium | Medium |
 | Log all executions | Low | High | Low |
 **Recommended Approach:**
 1. Add user confirmation dialog with code preview
 2. Implement execution sandboxing (Docker/container)
 3. Add audit logging
 4. Restrict available modules
 ### 7.2 High Priority Mitigations (P1)
 #### CVE-MC-003: XSS in Markdown
 **Current Mitigations:**
 - DOMPurify sanitization
 **Additional Required:**
 ```javascript
 // Enhanced DOMPurify configuration
 const purifyConfig = {
  ALLOWED_TAGS: [...],
  ALLOWED_ATTR: [...],
  FORBID_TAGS: ['script', 'iframe', 'object', 'embed'],
  FORBID_ATTR: ['onerror', 'onload', 'onclick'],
  ADD_ATTR: ['target'],
  FORCE_BODY: true
 };
 ```
 #### CVE-MC-005: Weak CSP
 **Current CSP:**
 ```
 default-src 'self';
 script-src 'self' 'unsafe-inline' 'unsafe-eval' https://cdn.jsdelivr.net;
 style-src 'self' 'unsafe-inline' https://cdnjs.cloudflare.com;
 img-src 'self' data: blob: file:;
 font-src 'self' data:;
 connect-src 'self' https://www.plantuml.com;
 ```
 **Recommended CSP:**
 ```
 default-src 'self';
 script-src 'self';
 style-src 'self';
 img-src 'self' data:;
 font-src 'self';
 connect-src 'self';
 frame-src 'none';
 object-src 'none';
 base-uri 'self';
 form-action 'self';
 ```
 **Note:** This requires:
 - Bundling all dependencies locally
 - Removing PlantUML server dependency (use local rendering)
 - Removing unsafe-inline and unsafe-eval
 ### 7.3 Medium Priority Mitigations (P2)
 #### CVE-MC-006/008: Window Security Consistency
 **Affected Windows:**
 - PDF export window (main.js:2579-2585)
 - Hidden conversion window (main.js:3263-3268)
 **Fix:**
 ```javascript
 webPreferences: {
  nodeIntegration: false,
  contextIsolation: true,
  sandbox: true,
  preload: path.join(__dirname, 'preload-pdf.js')
 }
 ```
 #### CVE-MC-007: PlantUML Data Exfiltration
 **Options:**
 1. Use local PlantUML JAR file
 2. Use PlantUML npm package
 3. Add warning before sending to external server
 4. Allow configuration of PlantUML server URL
 ---
 ## 8. Attack Tree Summary
 ### 8.1 Primary Attack Tree - Full System Compromise
 ```
 GOAL: Full System Compromise via MarkdownConverter
 │
 ├── [BRANCH A] Exploit CVE-MC-001 (nodeIntegration)
 │   │
 │   ├── [A.1] XSS via malicious markdown
 │   │   ├── [A.1.1] HTML injection
 │   │   ├── [A.1.2] SVG script injection
 │   │   └── [A.1.3] DOMPurify bypass
 │   │
 │   ├── [A.2] Compromised CDN script
 │   │   ├── [A.2.1] jsdelivr compromise
 │   │   └── [A.2.2] cdnjs compromise
 │   │
 │   └── [A.3] PlantUML SVG injection
 │       └── [A.3.1] Compromised plantuml.com
 │
 ├── [BRANCH B] Exploit CVE-MC-002 (REPL)
 │   │
 │   ├── [B.1] Social engineering
 │   │   ├── [B.1.1] Malicious tutorial document
 │   │   └── [B.1.2] Phishing with "config file"
 │   │
 │   └── [B.2] Code execution
 │       ├── [B.2.1] JavaScript (Node.js)
 │       ├── [B.2.2] Python
 │       └── [B.2.3] Bash/Shell
 │
 └── [BRANCH C] Chain Exploits
    │
    ├── [C.1] XSS -> RCE (CVE-MC-003 + CVE-MC-001)
    │   └── Impact: CVSS 9.8
    │
    ├── [C.2] Path Traversal -> Privilege Escalation
    │   └── Impact: CVSS 8.5
    │
    └── [C.3] PlantUML -> XSS -> RCE
        └── Impact: CVSS 9.1
 ```
 ### 8.2 Attack Success Probability
 | Attack Path | Complexity | Privileges Required | User Interaction | Probability |
 |-------------|------------|---------------------|------------------|-------------|
 | A.1 XSS->RCE | Low | None | Required | 75% |
 | A.2 CDN Compromise | High | None | None | 15% |
 | A.3 PlantUML->RCE | Medium | None | Required | 40% |
 | B.1 REPL Social Eng | Low | None | Required | 60% |
 | C.1 Combined XSS-RCE | Low | None | Required | 70% |
 ---
 ## 9. Recommendations
 ### 9.1 Immediate Actions (0-30 days)
 1. **CVE-MC-001**: Enable `contextIsolation: true` and `nodeIntegration: false` for main window
 2. **CVE-MC-002**: Add confirmation dialog before REPL execution with code preview
 3. **CVE-MC-005**: Remove `unsafe-inline` and `unsafe-eval` from CSP
 4. **CVE-MC-006**: Fix PDF export window security settings
 ### 9.2 Short-term Actions (30-90 days)
 1. **CVE-MC-002**: Implement sandboxed code execution environment
 2. **CVE-MC-003**: Enhance DOMPurify configuration, add CSP reporting
 3. **CVE-MC-007**: Implement local PlantUML rendering option
 4. Add comprehensive security audit logging
 ### 9.3 Long-term Actions (90+ days)
 1. **CVE-MC-010**: Implement dependency pinning and SCA scanning
 2. Security awareness training for users
 3. Implement secure development lifecycle (SDL)
 4. Regular penetration testing schedule
 ---
 ## 10. Appendix
 ### A. Security Configuration Audit
 **Main Window (main.js:323-334)**
 ```javascript
 // CURRENT (INSECURE)
 webPreferences: {
  nodeIntegration: true,      // CRITICAL: Allows require() in renderer
  contextIsolation: false,    // CRITICAL: No isolation between contexts
  spellcheck: true
 }
 // RECOMMENDED
 webPreferences: {
  nodeIntegration: false,
  contextIsolation: true,
  sandbox: true,
  spellcheck: true,
  webSecurity: true,
  allowRunningInsecureContent: false
 }
 ```
 **CSP Configuration (index.html:5)**
 ```html
 <!-- CURRENT (WEAK) -->
 <meta http-equiv="Content-Security-Policy"
  content="default-src 'self';
           script-src 'self' 'unsafe-inline' 'unsafe-eval' https://cdn.jsdelivr.net;
           ...">
 <!-- RECOMMENDED -->
 <meta http-equiv="Content-Security-Policy"
  content="default-src 'self';
           script-src 'self';
           style-src 'self';
           img-src 'self' data:;
           connect-src 'self';
           frame-src 'none';
           object-src 'none'">
 ```
 ### B. IPC Channel Security Review
 **High-Risk Channels:**
 | Channel | Risk | Recommendation |
 |---------|------|----------------|
 | `execute-code` | Critical | Remove or sandbox |
 | `save-file` | High | Add path validation |
 | `batch-convert` | Medium | Rate limiting exists |
 | `git-*` | Medium | Audit git operations |
 ### C. Dependency Security
 **Critical Dependencies:**
 | Package | Version | Known CVEs | Recommendation |
 |---------|---------|------------|----------------|
 | electron | 37.4.0 | None | Pin version |
 | dompurify | 3.3.1 | None | Keep updated |
 | marked | 17.0.3 | None | Keep updated |
 | mermaid | 11.12.3 | None | Review CSP impact |
 ---
 ## Document Control
 | Version | Date | Author | Changes |
 |---------|------|--------|---------|
 | 1.0 | 2026-03-15 | Security Team | Initial threat model |
 ---
 *This threat model should be reviewed and updated after any significant architectural changes or at minimum annually.*
@@ -1,502 +0,0 @@
 # MarkdownConverter v5.0 - React + Tauri + PWA Architecture Design
 **Date:** 2026-03-15
 **Status:** Approved
 **Target Platforms:** Desktop (Tauri), Web (PWA), Mobile (Future)
 ---
 ## Executive Summary
 This document outlines the architecture for MarkdownConverter v5.0, a complete rewrite using React, Tauri, and PWA technologies. The new architecture enables:
 - **Multi-platform support**: Single codebase for desktop, web, and future mobile
 - **Improved security**: Eliminates critical Electron vulnerabilities by design
 - **Reduced bundle size**: ~5-10MB desktop, ~137KB web (vs 150MB+ Electron)
 - **Better maintainability**: Component-based architecture with TypeScript
 - **Offline support**: Full PWA capabilities with IndexedDB storage
 ---
 ## 1. Project Structure
 ```
 markdown-converter-v5/
 ├── src/
 │   ├── components/
 │   │   ├── ui/                    # Shadcn/ui components (button, dialog, etc.)
 │   │   ├── editor/                # CodeMirror wrapper, toolbar
 │   │   ├── preview/               # Markdown preview, theme rendering
 │   │   ├── sidebar/               # Explorer, Git, Snippets, Templates panels
 │   │   ├── tabs/                  # Tab bar, tab management
 │   │   ├── dialogs/               # Export, batch converter, settings dialogs
 │   │   └── layout/                # Main layout, splitter panes
 │   │
 │   ├── hooks/
 │   │   ├── useEditor.ts           # Editor state & actions
 │   │   ├── useTheme.ts            # Theme management
 │   │   ├── useFileSystem.ts       # File operations (uses adapter)
 │   │   ├── useConversion.ts       # Conversion operations
 │   │   └── useKeyboardShortcuts.ts
 │   │
 │   ├── stores/
 │   │   ├── editorStore.ts         # Content, tabs, cursor position
 │   │   ├── settingsStore.ts       # User preferences
 │   │   ├── themeStore.ts          # Active theme, custom themes
 │   │   └── sidebarStore.ts        # Sidebar state, active panel
 │   │
 │   ├── adapters/
 │   │   ├── types.ts               # Interface definitions
 │   │   ├── tauri/
 │   │   │   ├── index.ts           # Tauri adapter implementation
 │   │   │   ├── fs.ts              # File system via Tauri
 │   │   │   ├── convert.ts         # Pandoc, FFmpeg via Tauri
 │   │   │   └── system.ts          # System info, paths
 │   │   ├── web/
 │   │   │   ├── index.ts           # Web adapter implementation
 │   │   │   ├── fs.ts              # IndexedDB + File System Access API
 │   │   │   ├── convert.ts         # WASM converters, cloud fallback
 │   │   │   └── system.ts          # Browser capabilities
 │   │   └── index.ts               # Platform detection & export
 │   │
 │   ├── wasm/
 │   │   ├── pdf.wasm               # PDF generation
 │   │   ├── marked.wasm            # Markdown parsing (if available)
 │   │   └── loader.ts              # WASM module loader
 │   │
 │   ├── lib/
 │   │   ├── markdown.ts            # Marked + plugins config
 │   │   ├── syntax.ts              # Highlight.js config
 │   │   ├── mermaid.ts             # Diagram rendering
 │   │   └── utils.ts               # Helper functions
 │   │
 │   ├── styles/
 │   │   ├── globals.css            # Tailwind imports, CSS variables
 │   │   ├── themes/                # Theme CSS files
 │   │   └── editor.css             # CodeMirror styling
 │   │
 │   ├── types/
 │   │   ├── editor.ts              # Editor-related types
 │   │   ├── conversion.ts          # Conversion options types
 │   │   └── platform.ts            # Platform capability types
 │   │
 │   ├── App.tsx                    # Root component
 │   ├── main.tsx                   # Entry point
 │   └── vite-env.d.ts
 │
 ├── src-tauri/                     # Tauri backend (Rust)
 │   ├── src/
 │   │   ├── main.rs                # Tauri entry
 │   │   ├── commands/              # IPC command handlers
 │   │   │   ├── fs.rs              # File system operations
 │   │   │   ├── convert.rs         # Pandoc, FFmpeg wrappers
 │   │   │   └── system.rs          # System utilities
 │   │   └── lib.rs
 │   ├── Cargo.toml
 │   └── tauri.conf.json
 │
 ├── public/
 │   ├── manifest.json              # PWA manifest
 │   ├── sw.js                      # Service worker
 │   ├── fonts/                     # JetBrains Mono, Inter
 │   └── icons/                     # App icons
 │
 ├── package.json
 ├── vite.config.ts
 ├── tailwind.config.ts
 ├── tsconfig.json
 └── components.json                # Shadcn/ui config
 ```
 ---
 ## 2. Component Architecture
 ```tsx
 // Component hierarchy
 <App>                              // Root layout, theme provider
 ├── <Layout>
 │   ├── <TitleBar />              // Draggable title bar (desktop only)
 │   ├── <TabBar />                // Document tabs
 │   ├── <MainContent>
 │   │   ├── <Sidebar>             // Collapsible sidebar
 │   │   │   ├── <ExplorerPanel />
 │   │   │   ├── <GitPanel />
 │   │   │   ├── <SnippetsPanel />
 │   │   │   └── <TemplatesPanel />
 │   │   ├── <EditorPane>          // Split view container
 │   │   │   ├── <CodeMirrorEditor />
 │   │   │   └── <PreviewPane>
 │   │   │       └── <MarkdownPreview />
 │   │   └── <BottomPanel>         // REPL, terminal, output
 │   └── <StatusBar />             // Line count, encoding, status
 │
 └── <Dialogs>                      // Portal-based dialogs
    ├── <ExportDialog />
    ├── <BatchConvertDialog />
    ├── <SettingsDialog />
    ├── <ThemeDialog />
    └── <PdfEditorDialog />
 ```
 **Key Components:**
 | Component | Props | Responsibility |
 |-----------|-------|----------------|
 | `CodeMirrorEditor` | `content`, `onChange`, `theme` | Wrap CodeMirror 6 with React |
 | `MarkdownPreview` | `content`, `theme` | Render sanitized HTML with themes |
 | `TabBar` | `tabs`, `activeId`, `onSelect`, `onClose` | Manage document tabs |
 | `Sidebar` | `activePanel`, `collapsed` | Collapsible sidebar container |
 | `ExportDialog` | `format`, `options` | Export configuration UI |
 ---
 ## 3. State Management (Zustand)
 ### Editor Store
 ```typescript
 interface Tab {
  id: string;
  title: string;
  content: string;
  filePath?: string;
  isDirty: boolean;
  cursorPosition: { line: number; column: number };
 }
 interface EditorState {
  tabs: Tab[];
  activeTabId: string | null;
  // Actions
  createTab: (title?: string) => string;
  closeTab: (id: string) => void;
  setActiveTab: (id: string) => void;
  updateContent: (id: string, content: string) => void;
  updateCursorPosition: (id: string, pos: { line: number; column: number }) => void;
  markSaved: (id: string, filePath?: string) => void;
 }
 ```
 ### Settings Store
 ```typescript
 interface SettingsState {
  theme: string;
  fontSize: number;
  fontFamily: string;
  previewMode: 'split' | 'editor' | 'preview';
  showLineNumbers: boolean;
  wordWrap: boolean;
  autoSave: boolean;
  autoSaveInterval: number;
 }
 ```
 **Stores Summary:**
 | Store | State | Persisted |
 |-------|-------|-----------|
 | `editorStore` | Tabs, content, cursor | Tab metadata only |
 | `settingsStore` | User preferences | Yes |
 | `themeStore` | Active theme, custom themes | Yes |
 | `sidebarStore` | Panel state, width | Yes |
 ---
 ## 4. Platform Adapters
 ### Adapter Interface
 ```typescript
 export interface PlatformAdapter {
  name: 'tauri' | 'web';
  // File System
  fs: {
    readFile: (path: string) => Promise<string>;
    writeFile: (path: string, content: string) => Promise<void>;
    deleteFile: (path: string) => Promise<void>;
    listDirectory: (path: string) => Promise<FileInfo[]>;
    exists: (path: string) => Promise<boolean>;
    watchDirectory?: (path: string, callback: WatchCallback) => () => void;
  };
  // Conversion
  convert: {
    toPdf: (content: string, options: PdfOptions) => Promise<Blob>;
    toDocx: (content: string, options: DocxOptions) => Promise<Blob>;
    toHtml: (content: string, options: HtmlOptions) => Promise<string>;
    batchConvert: (files: string[], format: string) => Promise<ConversionResult[]>;
  };
  // Capabilities
  capabilities: {
    hasPandoc: boolean;
    hasFfmpeg: boolean;
    hasLibreOffice: boolean;
    hasDirectFs: boolean;
    hasSystemNotifications: boolean;
  };
 }
 ```
 ### Platform Detection
 ```typescript
 // Auto-detect platform at startup
 const isTauri = typeof window !== 'undefined' &&
                '__TAURI__' in window;
 export const adapter: PlatformAdapter = isTauri
  ? tauriAdapter
  : webAdapter;
 ```
 ### Capability Differences
 | Feature | Tauri (Desktop) | Web (PWA) |
 |---------|-----------------|-----------|
 | File System | Direct access | IndexedDB + File System Access API |
 | PDF Export | Pandoc (native) | WASM converter |
 | DOCX Export | Pandoc (native) | Limited/not available |
 | Media Conversion | FFmpeg (native) | Cloud API or limited |
 | File Watching | Native events | Not available |
 | Offline | Always | Service Worker |
 ---
 ## 5. Build Configuration
 ### Vite Configuration
 - Target: ESNext
 - Minifier: esbuild
 - Code splitting by vendor chunks
 - Source maps enabled
 ### Tailwind Configuration
 - Dark mode: `class` strategy
 - Custom colors using CSS variables
 - Custom font families (JetBrains Mono, Inter)
 - Tailwindcss-animate plugin
 ### TypeScript Configuration
 - Target: ES2022
 - Strict mode enabled
 - All strict checks enabled
 - Path aliases (`@/*`)
 ### Bundle Sizes (Estimated)
 | Chunk | Size (gzipped) |
 |-------|----------------|
 | `vendor-react` | ~12KB |
 | `vendor-editor` | ~45KB |
 | `vendor-markdown` | ~35KB |
 | `vendor-ui` | ~15KB |
 | `app` (your code) | ~30KB |
 | **Total PWA** | **~137KB** |
 | Tauri desktop | ~5-10MB (with WebView) |
 ---
 ## 6. Tauri Backend (Rust)
 ### IPC Commands
 **File System:**
 - `read_file` - Read file content
 - `write_file` - Write file content
 - `delete_file` - Delete file
 - `list_directory` - List directory contents
 - `path_exists` - Check path existence
 - `watch_directory` - Watch for file changes
 **Conversion:**
 - `to_pdf` - Convert to PDF via Pandoc
 - `to_docx` - Convert to DOCX via Pandoc
 - `to_html` - Convert to HTML via Pandoc
 - `batch_convert` - Batch conversion
 **System:**
 - `check_dependencies` - Check for Pandoc, FFmpeg, LibreOffice
 - `get_config_dir` - Get config directory path
 ### Security Comparison
 | Aspect | Electron (Current) | Tauri |
 |--------|-------------------|-------|
 | `nodeIntegration` | `true` (CVE) | Not possible |
 | `contextIsolation` | `false` (CVE) | Always enforced |
 | Bundle size | ~150MB | ~5-10MB |
 | Memory usage | Higher | Lower |
 | IPC security | Manual whitelist | Compile-time verified |
 ---
 ## 7. PWA Configuration
 ### Web App Manifest
 - Name: Markdown Converter
 - Display: Standalone
 - Theme color: #5661b3
 - File handlers for .md, .markdown, .txt
 - Share target for receiving shared content
 ### Service Worker
 - Cache-first for static assets
 - Network-first for API calls
 - Stale-while-revalidate for dynamic content
 - Automatic update detection
 ### IndexedDB Storage
 **Stores:**
 - `files` - Offline file storage
 - `settings` - User preferences
 - `templates` - Custom templates
 ### PWA Features
 | Feature | Implementation |
 |---------|---------------|
 | Offline support | Service Worker + IndexedDB |
 | Install prompt | Web App Manifest |
 | File handling | File System Access API (Chrome) |
 | Share target | Share Target API |
 | Background sync | Background Sync API |
 ---
 ## 8. Migration Plan
 ### Timeline: 8 Weeks
 **Phase 1: Foundation (Week 1-2)**
 - Initialize new repo
 - Setup Vite + React + TypeScript
 - Configure Tailwind + Shadcn/ui
 - Setup Zustand stores
 - Create platform adapter interfaces
 - Setup Tauri project structure
 **Phase 2: Core Editor (Week 3-4)**
 - CodeMirrorEditor component
 - MarkdownPreview component
 - SplitPane layout
 - Theme system
 - Tab management
 - Keyboard shortcuts
 **Phase 3: Sidebar & Panels (Week 5)**
 - Sidebar container
 - ExplorerPanel
 - GitPanel
 - SnippetsPanel
 - TemplatesPanel
 - Bottom panel
 **Phase 4: Platform Adapters (Week 6)**
 - Web adapter implementation
 - Tauri adapter implementation
 - File system operations
 - PDF conversion
 - Capability detection
 **Phase 5: Export & Conversion (Week 7)**
 - ExportDialog
 - BatchConvertDialog
 - UniversalConverterDialog
 - ImageConverterDialog
 - AudioConverterDialog
 - VideoConverterDialog
 - PDF Editor Dialog
 **Phase 6: PWA & Polish (Week 8)**
 - Service Worker setup
 - Web App Manifest
 - IndexedDB storage
 - Offline mode indicator
 - Settings persistence
 - Accessibility audit
 - Performance optimization
 ### Parallel Development Strategy
 ```
 Current Electron App (v4.x)     New React+Tauri App (v5.0)
        │                               │
        │  Bug fixes only               │  Active development
        │  Security patches             │  Feature migration
        ▼                               ▼
   Stable release  ────────────>  Beta release
   (maintained)                    (new features)
 ```
 ---
 ## 9. Design Decisions Summary
 | Decision | Choice | Rationale |
 |----------|--------|-----------|
 | Code Structure | Single repo with platform adapters | Lightest weight, clean separation |
 | State Management | Zustand | Minimal (~1KB), simple API |
 | UI Library | Shadcn/ui + Tailwind | Copy-paste ownership, excellent DX |
 | Build Tool | Vite | Industry standard, fast HMR |
 | TypeScript | Strict mode | Maximum type safety |
 | Desktop Features | Hybrid (WASM core, desktop advanced) | Best of both worlds |
 | Migration | Parallel development | Zero disruption to stable release |
 ---
 ## 10. Success Criteria
 - [ ] All core editor features functional on both Tauri and PWA
 - [ ] Bundle size under 150KB for PWA
 - [ ] All 13 themes migrated and working
 - [ ] Export to PDF works on both platforms
 - [ ] Offline mode fully functional in PWA
 - [ ] WCAG 2.1 AA accessibility compliance
 - [ ] TypeScript strict mode with no `any` types
 - [ ] All IPC channels have TypeScript types
 - [ ] Security audit passes with no critical issues
 ---
 ## Appendix: Dependencies
 ### Production Dependencies
 - `react` - UI library
 - `react-dom` - React DOM renderer
 - `zustand` - State management
 - `@radix-ui/react-*` - Headless UI primitives
 - `@codemirror/*` - Code editor
 - `marked` - Markdown parser
 - `highlight.js` - Syntax highlighting
 - `mermaid` - Diagram rendering
 - `dompurify` - HTML sanitization
 - `class-variance-authority` - Component variants
 - `clsx` + `tailwind-merge` - Class utilities
 - `lucide-react` - Icons
 ### Development Dependencies
 - `@tauri-apps/cli` - Tauri CLI
 - `typescript` - TypeScript compiler
 - `vite` - Build tool
 - `tailwindcss` - CSS framework
 - `eslint` - Linting
 - `prettier` - Formatting
 ---
 *Document generated: 2026-03-15*
 *Next step: Invoke writing-plans skill to create detailed implementation plan*
@@ -1,202 +0,0 @@
 # Modal System Design
 **Date:** 2026-03-24
 **Version:** 4.0.0
 **Status:** Approved
 ## Overview
 Replace the existing dialog implementations with a unified modal system that provides:
 - Glassmorphism backdrop matching app aesthetic
 - Full accessibility (ARIA, focus trap, keyboard navigation)
 - Smooth fade + scale animations
 - Consistent API via `ModalManager` class
 ## Decisions Made
 | Decision | Choice | Rationale |
 |----------|--------|-----------|
 | Architecture | Unified `ModalManager` class | Cleaner, consistent behavior across all modals |
 | Backdrop style | Glassmorphism | Matches existing app design language |
 | Focus management | Focus first interactive element | Standard, predictable behavior |
 | Animation | Fade + scale (95% → 100%) | Modern, subtle effect |
 | Implementation | Custom (not native `<dialog>`) | Full control, no polyfill concerns |
 ## Architecture
 ### File Structure
 ```
 src/
 ├── utils/
 │   └── ModalManager.js    # Core modal logic (~150 lines)
 ├── styles/
 │   └── modal.css          # Unified modal styles (~200 lines)
 └── index.html             # Updated dialog markup
 ```
 ### ModalManager Class
 ```javascript
 class ModalManager {
  constructor(element, options = {})
  open()                    // Show modal with animation
  close()                   // Hide modal with animation
  destroy()                 // Cleanup event listeners
  on(event, callback)       // Event subscription
  // Internal
  #createBackdrop()         // Create glassmorphism backdrop
  #trapFocus()              // Manage focus within modal
  #handleKeydown(e)         // Escape key handler
  #getFocusableElements()   // Query focusable children
 }
 ```
 ### Events
 - `open` — Fired after open animation completes
 - `close` — Fired after close animation completes
 ## CSS Design
 ### Variables (from tokens.css)
 ```css
 --z-modal: 200;
 --transition-normal: 200ms cubic-bezier(0.4, 0, 0.2, 1);
 --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
 --radius-lg: 0.5rem;
 ```
 ### Backdrop
 ```css
 .modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: var(--z-modal);
 }
 ```
 ### Modal Container
 ```css
 .modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: calc(var(--z-modal) + 1);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal),
              visibility var(--transition-normal);
 }
 .modal.open {
  opacity: 1;
  visibility: visible;
 }
 ```
 ### Modal Content (with animation)
 ```css
 .modal-content {
  background: hsl(var(--background));
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  max-width: 90vw;
  max-height: 90vh;
  overflow: hidden;
  transform: scale(0.95);
  transition: transform var(--transition-normal);
 }
 .modal.open .modal-content {
  transform: scale(1);
 }
 ```
 ## HTML Structure
 All dialogs convert to unified structure:
 ```html
 <div id="export-dialog"
     class="modal"
     role="dialog"
     aria-modal="true"
     aria-labelledby="export-dialog-title">
  <div class="modal-backdrop" data-close></div>
  <div class="modal-content">
    <div class="modal-header">
      <h3 id="export-dialog-title">Export Options</h3>
      <button class="modal-close" aria-label="Close">&times;</button>
    </div>
    <div class="modal-body">
      <!-- Dialog-specific content -->
    </div>
    <div class="modal-footer">
      <button class="btn btn-secondary" data-close>Cancel</button>
      <button class="btn btn-primary">Confirm</button>
    </div>
  </div>
 </div>
 ```
 ### Key Attributes
 - `role="dialog"` — Screen reader identification
 - `aria-modal="true"` — Prevents screen reader from accessing background
 - `aria-labelledby` — References the dialog title
 - `data-close` — Click handler for closing (backdrop, cancel buttons)
 ## Accessibility Features
 1. **Focus trap** — Tab cycles within modal only
 2. **Focus first element** — Auto-focuses first input/button on open
 3. **Escape key** — Closes modal
 4. **Click outside** — Clicking backdrop closes modal
 5. **Focus restoration** — Returns focus to trigger element on close
 6. **ARIA attributes** — Proper screen reader support
 ## Dialogs to Migrate
 | Dialog ID | Current Class | Complexity |
 |-----------|--------------|------------|
 | `find-dialog` | `.find-dialog` | Simple |
 | `export-dialog` | `.export-dialog` | Complex (many sections) |
 | `print-preview-overlay` | `.export-dialog` | Medium |
 | `table-generator-dialog` | `.export-dialog` | Simple |
 | `ascii-art-dialog` | `.export-dialog` | Medium |
 | `universal-converter-dialog` | `.export-dialog` | Complex |
 | `batch-dialog` | `.batch-dialog` | Complex |
 | `pdf-editor-dialog` | `.export-dialog` | Complex |
 | `header-footer-dialog` | `.export-dialog` | Medium |
 | `field-picker-dialog` | `.export-dialog` | Simple |
 ## Migration Steps
 1. Create `src/utils/ModalManager.js`
 2. Create `src/styles/modal.css`
 3. Update `index.html` to include new stylesheet
 4. Convert each dialog HTML to new structure
 5. Initialize `ModalManager` instances in `renderer.js`
 6. Remove old CSS from `styles.css`
 7. Test all dialogs
 ## Out of Scope
 - Modal nesting (stacked modals) — can be added later if needed
 - Animated backdrop (currently static blur)
 - Modal size variants (small/large/fullscreen) — can use inline styles
@@ -1,326 +0,0 @@
 # V4 Enhancement + Flutter Exploration Design
 **Date:** 2026-03-24
 **Status:** Approved
 **Approach:** Incremental V4 Enhancement + Flutter Spike (70/30 split)
 ---
 ## Executive Summary
 This design outlines a two-track approach:
 1. **V4 Enhancement (70%)**: Fix critical bugs, optimize performance, add platform adapters, improve UI patterns
 2. **Flutter Exploration (30%)**: Build proof-of-concept for cross-platform evaluation (Windows, Mobile, Web)
 ---
 ## Goals & Scope
 ### Primary Goals
 1. **Fix critical bug**: PDF and markdown multitab functionality
 2. **Performance improvements**: Faster startup, smoother editing, responsive preview
 3. **Architecture improvements**: Platform adapters, cleaner state management
 4. **Flutter research**: Proof-of-concept for cross-platform evaluation
 ### Out of Scope
 - Full V5 migration
 - Complete UI redesign
 - New features (focus on optimization)
 ### Success Criteria
 | Metric | Current | Target |
 |--------|---------|--------|
 | Startup time | ~3-5s | <2s |
 | Editor typing latency | Noticeable lag | <16ms |
 | Preview render (1MB file) | ~500ms | <200ms |
 | Memory usage | ~300MB | <200MB |
 | Bundle size | ~150MB | <100MB |
 ---
 ## Section 1: V4 Critical Fixes & Performance Optimizations
 ### 1.1 Fix: PDF/Markdown Multitab Bug
 **Location:** `src/renderer.js` (TabManager class)
 **Investigation areas:**
 - `switchToTab()` - ensure proper state preservation
 - `closeTab()` - ensure EditorView cleanup
 - Add tab type tracking (markdown vs pdf)
 - Isolate PDF viewer state from editor state
 ### 1.2 Startup Performance Optimizations
 | Optimization | Implementation | Expected Gain |
 |--------------|----------------|---------------|
 | Defer Mermaid | Load only when diagram detected | ~500ms |
 | Defer PDF.js | Load on first PDF open | ~800ms |
 | Lazy load themes | Load active theme only | ~200ms |
 | Lazy sidebar panels | Load panel code when sidebar opens | ~300ms |
 | Preload optimization | Remove unused IPC channels | ~100ms |
 **Lazy loading pattern:**
 ```javascript
 // Current (loads everything upfront)
 const { dialog } = require('@electron/remote');
 // Optimized (load on demand)
 let _dialog;
 function getDialog() {
  if (!_dialog) _dialog = require('@electron/remote').dialog;
  return _dialog;
 }
 ```
 ### 1.3 Editor Performance
 | Issue | Solution |
 |-------|----------|
 | Typing lag with large files | Debounce preview updates (300ms) |
 | Syntax highlight overhead | Use highlight.js lazy mode |
 | Memory leaks | Clean up EditorView on tab close |
 | Theme switching lag | Pre-compile theme CSS |
 ### 1.4 Preview Rendering
 | Issue | Solution |
 |-------|----------|
 | Mermaid slow | Render on-demand, cache results |
 | Full re-render on keystroke | Debounced incremental updates |
 | Large documents | Viewport rendering (visible portion only) |
 ---
 ## Section 2: Platform Adapter Pattern
 ### 2.1 Architecture
 ```
 src/
 ├── adapters/
 │   ├── index.js              # Auto-detects and exports adapter
 │   ├── types.js              # Interface definitions (JSDoc)
 │   │
 │   ├── electron/             # Current Electron implementation
 │   │   ├── index.js          # Exports electronAdapter
 │   │   ├── fs.js             # File system operations
 │   │   ├── convert.js        # Pandoc, FFmpeg conversions
 │   │   ├── pdf.js            # PDF operations
 │   │   └── system.js         # System info, dialogs, notifications
 │   │
 │   └── mock/                 # For testing
 │       └── index.js          # Mock adapter for unit tests
 ```
 ### 2.2 Adapter Interface
 ```javascript
 /**
 * @typedef {Object} PlatformAdapter
 * @property {'electron'} name
 * @property {FileSystemAdapter} fs
 * @property {ConversionAdapter} convert
 * @property {PdfAdapter} pdf
 * @property {SystemAdapter} system
 */
 /**
 * @typedef {Object} FileSystemAdapter
 * @property {(path: string) => Promise<string>} readFile
 * @property {(path: string, content: string) => Promise<void>} writeFile
 * @property {(path: string) => Promise<void>} deleteFile
 * @property {(path: string) => Promise<FileInfo[]>} listDirectory
 * @property {(path: string) => Promise<boolean>} exists
 */
 ```
 ### 2.3 Migration Strategy
 | Phase | What | Files Affected |
 |-------|------|----------------|
 | 1 | Create adapter structure | New files only |
 | 2 | Migrate file operations | `renderer.js`, `sidebar/*.js` |
 | 3 | Migrate conversions | Export dialogs |
 | 4 | Migrate PDF operations | PDF viewer |
 | 5 | Remove old IPC calls | `preload.js` cleanup |
 ---
 ## Section 3: UI Improvements (Shadcn/ui Patterns)
 ### 3.1 Design Token System
 ```css
 /* src/styles/tokens.css */
 :root {
  /* Colors - Light mode */
  --background: 0 0% 100%;
  --foreground: 222.2 84% 4.9%;
  --primary: 227 44% 52%;
  --primary-foreground: 210 40% 98%;
  --secondary: 210 40% 96.1%;
  --secondary-foreground: 222.2 47.4% 11.2%;
  --muted: 210 40% 96.1%;
  --muted-foreground: 215.4 16.3% 46.9%;
  --destructive: 0 84.2% 60.2%;
  --border: 214.3 31.8% 91.4%;
  --ring: 227 44% 52%;
  /* Spacing & Radii */
  --radius: 0.5rem;
 }
 ```
 ### 3.2 Component Improvements
 | Component | Current Issue | Fix |
 |-----------|---------------|-----|
 | Buttons | Inconsistent hover/focus | Use `.btn` with variants |
 | Dialogs | Missing focus trap | Add focus trap, Escape key, aria-modal |
 | Tabs | No keyboard navigation | Add arrow key nav, aria-selected |
 | Sidebar | No collapse animation | CSS transitions |
 | Dropdowns | Missing click-outside | Add proper event handling |
 ### 3.3 Accessibility Improvements
 - Focus states with `:focus-visible`
 - Skip to content link
 - ARIA labels on interactive elements
 - Keyboard navigation for all components
 ---
 ## Section 4: Flutter Exploration (30% Effort)
 ### 4.1 Flutter Project Structure
 ```
 markdown-converter-flutter/
 ├── lib/
 │   ├── main.dart
 │   ├── app.dart
 │   ├── core/
 │   │   ├── theme/
 │   │   └── constants.dart
 │   ├── features/
 │   │   ├── editor/
 │   │   ├── preview/
 │   │   └── tabs/
 │   ├── services/
 │   │   ├── file_service.dart
 │   │   ├── export_service.dart
 │   │   └── platform_service.dart
 │   └── adapters/
 │       ├── file_adapter.dart
 │       ├── file_adapter_mobile.dart
 │       ├── file_adapter_web.dart
 │       └── file_adapter_desktop.dart
 ├── pubspec.yaml
 ├── windows/
 ├── web/
 └── lib/
 ```
 ### 4.2 Key Dependencies
 ```yaml
 dependencies:
  flutter_markdown: ^0.7.0
  flutter_code_editor: ^0.3.0
  provider: ^6.1.0
  file_picker: ^8.0.0
  path_provider: ^2.1.0
  pdf: ^3.10.0
  printing: ^5.12.0
 ```
 ### 4.3 Prototype Features
 | Feature | Priority |
 |---------|----------|
 | Basic markdown editor | Must have |
 | Live preview | Must have |
 | Light/dark theme | Must have |
 | Tab management | Should have |
 | File open/save | Should have |
 | PDF export | Nice to have |
 | Windows exe build | Must have |
 | Web build | Must have |
 | Mobile build | Should have |
 ### 4.4 Evaluation Criteria
 | Metric | Target |
 |--------|--------|
 | Windows exe size | <50MB |
 | Web initial load | <500KB |
 | Cold start time | <2s |
 | Editor typing latency | <16ms |
 ### 4.5 Flutter vs Tauri Comparison
 | Aspect | Flutter | Tauri + React |
 |--------|---------|---------------|
 | Mobile support | ✅ Excellent | ❌ Requires separate app |
 | Web performance | ⚠️ Good, larger | ✅ Excellent, small |
 | Desktop bundle | ⚠️ ~30-50MB | ✅ ~5-10MB |
 | Native feel | ⚠️ Custom rendering | ✅ System WebView |
 | Code reuse | ✅ 100% shared | ⚠️ Some platform-specific |
 ---
 ## Implementation Timeline
 ### Phase 1: V4 Critical Fixes (Week 1)
 - Fix PDF/markdown multitab bug
 - Implement startup optimizations
 - Add debounced preview rendering
 ### Phase 2: Platform Adapters (Week 2)
 - Create adapter structure
 - Migrate file operations
 - Migrate conversions
 ### Phase 3: UI Improvements (Week 3)
 - Add design tokens
 - Improve component accessibility
 - Add keyboard navigation
 ### Phase 4: Flutter Prototype (Weeks 2-4, parallel)
 - Set up Flutter project
 - Implement basic editor
 - Build Windows and Web versions
 - Document findings
 ---
 ## Risk Mitigation
 | Risk | Mitigation |
 |------|------------|
 | Multitab fix causes regressions | Comprehensive test suite before changes |
 | Performance optimizations break features | Incremental changes with benchmarks |
 | Flutter proves unsuitable | 30% effort limit, V4 remains primary |
 | Platform adapter migration too slow | Phased approach, each phase independent |
 ---
 ## Success Metrics
 - [ ] Multitab functionality working correctly
 - [ ] Startup time < 2 seconds
 - [ ] No perceived editor lag with files < 1MB
 - [ ] Preview renders in < 200ms
 - [ ] Bundle size reduced by 30%+
 - [ ] Platform adapters for fs, convert, pdf implemented
 - [ ] Design tokens applied to all components
 - [ ] Flutter prototype running on Windows + Web
 - [ ] Flutter evaluation documented with recommendation
 ---
 *Document generated: 2026-03-24*
 *Next step: Create detailed implementation plan*
@@ -1,335 +0,0 @@
 # Writer's Studio Feature Pack — Design Document
 **Date**: 2026-04-06
 **Version**: 4.2.0 target
 **Status**: Approved
 **Scope**: Three cohesive features to transform MarkdownConverter into a writing environment
 ---
 ## Overview
 The Writer's Studio Feature Pack adds three interconnected features to MarkdownConverter:
 1. **Zen Mode** — Distraction-free writing environment with typewriter scrolling
 2. **Document Outline** — Heading hierarchy sidebar panel for navigation
 3. **Writing Analytics** — Real-time readability and vocabulary analysis dashboard
 These features work together: Zen Mode creates the environment, Outline provides navigation, Analytics gives insight.
 ---
 ## Feature 1: Zen Mode
 ### Purpose
 Transform the app from a multi-tool into a focused writing environment. Inspired by iA Writer, Typora, and Bear.
 ### New Files
 - `src/zen-mode.js` — ZenMode class (~150 lines)
 - `src/styles-zen.css` — Zen mode specific styles (~120 lines)
 ### Integration Points
 - `src/renderer.js` — Initialize ZenMode, register F11 shortcut, add View > Zen Mode menu
 - `src/editor/codemirror-setup.js` — Export typewriter + dimming extensions
 ### Behavior
 **Toggle**: F11, View > Zen Mode, command palette "Toggle Zen Mode"
 **Exit**: Escape key, F11 again
 **What hides**:
 - Tab bar
 - Toolbar
 - Sidebar (collapsed)
 - Status bar
 - App header
 **What shows**:
 - Editor (full viewport)
 - Floating HUD (bottom-center, semi-transparent)
 ### Floating HUD
 ```
 ┌─────────────────────────────────────────┐
 │  847 words  •  ~4 min  •  23:45 session │
 │  ████████████████░░░░  85% of 1000      │
 └─────────────────────────────────────────┘
 ```
 - Word count (from existing status bar logic)
 - Estimated reading time (~200 wpm)
 - Session timer (starts when zen mode activates)
 - Optional progress bar toward word goal
 ### CodeMirror Extensions
 **Typewriter Scroll** (`ViewPlugin`):
 - Listens to `EditorView.update` for selection changes
 - Calls `editor.dispatch({ effects: EditorView.scrollIntoView(pos, { y: 'center' }) })`
 - Smooth scrolling with `scrollBehavior: 'smooth'` in CSS
 **Line Dimming** (`ViewPlugin` + `Decoration`):
 - Builds a `DecorationSet` mapping each line to an opacity value
 - Active line: opacity 1.0
 - 1-2 lines away: 0.7
 - 3-4 lines away: 0.5
 - 5+ lines away: 0.3
 - Uses `Decoration.line({ attributes: { style: 'opacity: X' } })`
 ### Centered Column
 CSS applied to `.zen-mode .cm-content`:
 ```css
 .zen-mode .cm-content {
    max-width: 700px;
    margin: 0 auto;
    font-size: 18px;
    line-height: 1.8;
 }
 ```
 ### State Management
 - `this.previousState` stores which UI elements were visible before zen mode
 - On exit, restores all elements to their previous visibility
 - Editor content, cursor position, and scroll state are never modified
 ---
 ## Feature 2: Document Outline Panel
 ### Purpose
 Provide always-visible heading navigation for documents of any length. The single most-requested navigation feature for multi-section documents.
 ### New Files
 - `src/sidebar/outline-panel.js` — `renderOutlinePanel` function (~100 lines)
 ### Modified Files
 - `src/index.html` — Add outline icon button in sidebar icons strip
 - `src/renderer.js` — Register 'outline' panel, provide editor reference
 ### Sidebar Integration
 Uses existing `SidebarManager.registerPanel()` API:
 ```javascript
 sidebarManager.registerPanel('outline', {
    title: 'Outline',
    render: (container) => renderOutlinePanel(container, editor, editorContent)
 });
 ```
 New icon button in sidebar strip (after templates icon):
 ```html
 <button class="sidebar-icon" data-panel="outline" title="Outline (Ctrl+Shift+O)">
    <!-- hierarchy/list icon SVG -->
 </button>
 ```
 ### Parsing Logic
 Parse headings from raw markdown content using regex:
 ```javascript
 const headingRegex = /^(#{1,6})\s+(.+)$/gm;
 ```
 Returns array of:
 ```javascript
 { level: 1-6, text: "Heading Text", line: 42 }
 ```
 Debounced at 300ms to avoid re-parsing on every keystroke.
 ### UI Structure
 ```
 ┌──────────────────────────────────────────┐
 │  OUTLINE                          ☰      │
 ├──────────────────────────────────────────┤
 │  ▸ Introduction                  (H1)    │
 │    ▸ Getting Started             (H2)    │
 │    ▸ Prerequisites               (H2)    │
 │      ▸ Node.js                   (H3) ◄  │
 │    ▸ Installation                (H2)    │
 │  ▸ Features                      (H1)    │
 │    ▸ Editor                      (H2)    │
 │    ▸ Export                      (H2)    │
 ├──────────────────────────────────────────┤
 │  9 headings  •  2 H1  •  4 H2  •  3 H3  │
 └──────────────────────────────────────────┘
 ```
 - Indentation based on heading level (H1 = 0px, H2 = 16px, H3 = 32px, etc.)
 - Current heading highlighted with accent color (◄ indicator)
 - Hover shows full heading text if truncated
 ### Click-to-Navigate
 ```javascript
 editor.dispatch({
    effects: EditorView.scrollIntoView(linePos, { y: 'center' })
 });
 ```
 Brief highlight animation on the target line (fades out over 500ms).
 ### Current Heading Sync
 On editor update (debounced 100ms):
 1. Get cursor line number
 2. Find the last heading whose line number <= cursor line
 3. Set that heading as active in the outline
 ### Empty State
 When no headings found:
 ```
 No headings found
 Use # to create headings:
 # Heading 1
 ## Heading 2
 ### Heading 3
 ```
 ---
 ## Feature 3: Writing Analytics
 ### Purpose
 Give writers real-time insight into their document's readability, structure, and vocabulary. This is the "surprise" feature most Markdown editors lack.
 ### New Files
 - `src/analytics/writing-analytics.js` — `WritingAnalytics` class (~180 lines)
 - `src/analytics/analytics-panel.js` — `renderAnalyticsPanel` function (~120 lines)
 ### Integration Points
 - `src/renderer.js` — Register Ctrl+Shift+A shortcut, command palette entry, View menu item
 ### Trigger
 - Keyboard: `Ctrl+Shift+A`
 - Command Palette: "Show Writing Analytics"
 - Menu: View > Writing Analytics
 ### Presentation
 Uses existing `ModalManager` to show a modal overlay with analytics dashboard.
 ```
 ┌─────────────────────────────────────────────────────┐
 │  Writing Analytics                              ✕   │
 ├─────────────────────────────────────────────────────┤
 │                                                      │
 │  ┌─ Readability ──────────────────────────────────┐ │
 │  │  Flesch Reading Ease:  67.3 (Standard)    ○   │ │
 │  │  Grade Level:          8.2              ○○○●○  │ │
 │  └─────────────────────────────────────────────────┘ │
 │                                                      │
 │  ┌─ Timing ───────────────────────────────────────┐ │
 │  │  Reading Time:   ~4 min                        │ │
 │  │  Speaking Time:  ~6 min                        │ │
 │  └─────────────────────────────────────────────────┘ │
 │                                                      │
 │  ┌─ Structure ────────────────────────────────────┐ │
 │  │  Sentences:  42  •  Paragraphs:  8            │ │
 │  │  Avg Sentence:  14.2 words                     │ │
 │  │  Longest:  38 words ("The quick brown fox...") │ │
 │  └─────────────────────────────────────────────────┘ │
 │                                                      │
 │  ┌─ Vocabulary ───────────────────────────────────┐ │
 │  │  Unique: 312 / 847 words (36.8%)               │ │
 │  │  Top: the(42) and(31) markdown(28) ...         │ │
 │  └─────────────────────────────────────────────────┘ │
 │                                                      │
 │  ┌─ Word Goal ────────────────────────────────────┐ │
 │  │  Target: [1000] words                          │ │
 │  │  ████████████████░░░░  847/1000 (85%)          │ │
 │  └─────────────────────────────────────────────────┘ │
 │                                                      │
 └─────────────────────────────────────────────────────┘
 ```
 ### Metrics Implementation
 **Readability (Flesch-Kincaid):**
 ```javascript
 // Flesch Reading Ease
 ease = 206.835 - 1.015 * (words / sentences) - 84.6 * (syllables / words);
 // Flesch-Kincaid Grade Level
 grade = 0.39 * (words / sentences) + 11.8 * (syllables / words) - 15.59;
 ```
 **Syllable Estimation:**
 ```javascript
 function countSyllables(word) {
    word = word.toLowerCase().replace(/(?:[^laeiouy]es|ed|[^laeiouy]e)$/, '');
    word = word.replace(/^y/, '');
    return word.match(/[aeiouy]{1,2}/g)?.length || 1;
 }
 ```
 **Reading/Speaking Time:**
 - Reading: 200 words/minute
 - Speaking: 130 words/minute
 **Lexical Diversity:**
 - Ratio of unique words to total words (excluding stop words)
 **Top Words:**
 - Frequency map, sorted descending, top 10
 - Excludes common stop words (the, a, an, is, are, etc.)
 ### Word Goal
 - Persisted in `electron-store` per document (or global default)
 - Progress bar with percentage
 - Celebration effect when goal is reached (brief confetti animation or green flash)
 ### Update Cadence
 - Re-analyzes on editor content change (debounced at 1000ms)
 - If modal is open, updates live
 - If modal is closed, no computation (zero overhead)
 ---
 ## File Summary
 | File | Action | Purpose |
 |------|--------|---------|
 | `src/zen-mode.js` | Create | ZenMode class with CM6 extensions |
 | `src/styles-zen.css` | Create | Zen mode styling |
 | `src/sidebar/outline-panel.js` | Create | Outline sidebar panel |
 | `src/analytics/writing-analytics.js` | Create | Analytics computation engine |
 | `src/analytics/analytics-panel.js` | Create | Analytics modal UI |
 | `src/index.html` | Modify | Add outline icon, zen mode button |
 | `src/renderer.js` | Modify | Initialize all three features |
 | `src/editor/codemirror-setup.js` | Modify | Export typewriter + dimming extensions |
 ## Keyboard Shortcuts
 | Shortcut | Feature | Action |
 |----------|---------|--------|
 | F11 | Zen Mode | Toggle on/off |
 | Escape | Zen Mode | Exit (when active) |
 | Ctrl+Shift+O | Outline | Open outline sidebar panel |
 | Ctrl+Shift+A | Analytics | Open analytics modal |
 ## Dependencies
 No new npm dependencies required. All features use:
 - Existing CodeMirror 6 APIs (ViewPlugin, Decoration, scrollIntoView)
 - Existing SidebarManager API
 - Existing ModalManager API
 - Pure JavaScript math for analytics
@@ -1,426 +0,0 @@
 # MarkdownConverter v5.0 — Platform Design
 **Date:** 2026-04-14
 **Status:** Approved
 **Author:** Amit Haridas
 ## Overview
 Transform MarkdownConverter from a monolithic editor into an extensible platform with a plugin system and three feature packs, shipped together as v5.0.
 ## Subsystems
 1. **Plugin System** — Lightweight plugin registry with extension points (sidebar, commands, settings, status bar, export hooks, event bus)
 2. **Writing Studio Plugin** — Manuscript manager, goal tracking, writing sprints, snapshots, smart proofreading
 3. **AI Assistant Plugin** — Multi-provider AI writing assistant (Ollama, LMStudio, GGUF direct with GPU, Anthropic, OpenAI)
 4. **Collaboration Plugin** — Git-based async collaboration, comments/annotations, review requests
 ## Core Principle
 **Existing functionality is never replaced or broken.** The plugin system is additive. All existing keyboard shortcuts, features, and UI remain untouched. Plugin shortcuts use `Ctrl+Alt+` namespace.
 ---
 ## 1. Plugin System
 ### File Structure
 ```
 src/
  plugins/
    plugin-registry.js      # Load, register, lifecycle
    plugin-api.js            # Base class plugins extend
    plugin-loader.js         # Discovers and validates manifests
    built-in/
      writing-studio/
        manifest.json
        index.js
        panels/
        components/
      ai-assistant/
        manifest.json
        index.js
        providers/
      collaboration/
        manifest.json
        index.js
 ```
 ### Manifest Schema
 ```json
 {
  "id": "writing-studio",
  "name": "Writing Studio",
  "version": "1.0.0",
  "description": "Manuscript management, goal tracking, writing sprints",
  "icon": "pen-tool",
  "extensionPoints": {
    "sidebar": { "panel": "panels/manuscript-panel.js", "order": 30 },
    "settings": { "section": "settings/index.js" },
    "statusBar": { "indicators": ["sprint-timer", "word-goal"] },
    "commands": [
      { "id": "start-sprint", "label": "Start Writing Sprint", "shortcut": "Ctrl+Alt+S" },
      { "id": "take-snapshot", "label": "Take Snapshot", "shortcut": "Ctrl+Alt+N" }
    ],
    "exportHooks": {
      "preExport": "hooks/pre-export.js",
      "postExport": "hooks/post-export.js"
    }
  },
  "settings": [
    { "key": "dailyGoal", "type": "number", "default": 1000, "label": "Daily word goal" },
    { "key": "sprintDuration", "type": "number", "default": 25, "label": "Sprint duration (min)" }
  ]
 }
 ```
 ### Plugin Lifecycle
 1. PluginLoader discovers manifests in `built-in/` + user plugins directory
 2. PluginRegistry validates manifests
 3. Each plugin calls `Plugin.init(context)` receiving scoped API context
 4. Extension points registered (sidebar panels, commands, status bar items)
 5. Plugins activate lazily — sidebar panel loads JS when user clicks tab
 ### Plugin Context API
 Each plugin's `init()` receives:
 ```javascript
 {
  sidebar: {
    registerPanel(id, { icon, title, component })
  },
  commands: {
    register(id, label, handler, shortcut?)
  },
  statusBar: {
    registerIndicator(id, { position, render })
  },
  settings: {
    get(key),                    // plugin-scoped
    set(key, value),             // auto-persisted via electron-store
    onChanged(key, callback)
  },
  editor: {
    getContent(),                // current document
    getSelection(),              // selected text
    insertAtCursor(text),        // requires opt-in
    onContentChanged(callback)
  },
  events: {
    on(event, handler),
    emit(event, data)
  },
  exports: {
    registerPreHook(handler),
    registerPostHook(handler)
  },
  ipc: {
    invoke(channel, ...args),
    on(channel, handler)
  }
 }
 ```
 ### Event Bus Events
 Each event has a versioned payload schema. Breaking changes increment the version suffix.
 ```
 document:opened        → { filePath: string, tabId: string }
 document:saved         → { filePath: string, tabId: string }
 document:changed       → { tabId: string, content: string, wordCount: number }
 editor:selection-changed → { tabId: string, text: string, from: {line,ch}, to: {line,ch} }
 tab:switched           → { tabId: string, filePath: string }
 tab:closed             → { tabId: string, filePath: string }
 export:started         → { format: string, filePath: string }
 export:completed       → { format: string, filePath: string, outputPath: string }
 export:failed          → { format: string, error: string }
 plugin:loaded          → { pluginId: string, version: string }
 plugin:activated       → { pluginId: string }
 plugin:deactivated     → { pluginId: string }
 app:ready              → {}
 app:before-quit        → {}
 ```
 ### Design Rules
 - Built-in plugins use the same API as future third-party plugins
 - Lazy activation — sidebar panels don't load until clicked
 - Scoped settings: `plugins.<id>.<key>` in electron-store
 - Plugin commands globally unique — registry rejects duplicate command IDs at load time
 - **Plugin sandboxing**: each plugin handler is wrapped in try/catch. For CPU-intensive operations (AI inference, diff computation), plugins must delegate to main process via IPC. Handlers that block the renderer for >5s trigger a warning notification. Memory-hungry operations (GGUF inference) run in isolated child processes.
 - **Cross-plugin graceful degradation**: plugins check `context.events.hasHandler('ai:analyze')` before emitting cross-plugin requests. If no handler (AI plugin disabled), show a "this feature requires the AI plugin" prompt instead of failing silently. All cross-plugin calls have a 30s timeout with default fallback behavior.
 ---
 ## 2. Writing Studio Plugin
 ### 2A. Manuscript / Project Manager
 Folder-based project structure:
 ```
 ~/Manuscripts/
  my-novel/
    .project.json          # { title, targets, metadata }
    01-chapter-one.md
    02-chapter-two.md
    characters/
      protagonist.md
    research/
      world-building.md
    .snapshots/
      2026-04-14T10-30.json
 ```
 `.project.json`:
 ```json
 {
  "title": "My Novel",
  "type": "manuscript",
  "target": { "words": 80000, "deadline": "2026-09-01" },
  "chapters": [
    { "file": "01-chapter-one.md", "title": "The Beginning", "status": "draft" }
  ],
  "metadata": { "author": "", "genre": "", "synopsis": "" }
 }
 ```
 Sidebar panel shows project tree with drag-to-reorder, word counts per chapter, target progress bar. "Compile manuscript" exports all chapters as a single document.
 ### 2B. Goal Tracking & Writing Sprints
 - **Status bar**: daily progress bar + sprint timer
 - **Writing sprint**: configurable duration (15/25/30/45/60 min), word count delta, WPM at end
 - **Goal tracking**: daily/weekly word goals, streak tracking, 30-day bar chart
 - **Enhanced analytics**: session tracking, readability scores, productive time-of-day heatmap
 - Data stored in `plugins.writing-studio.history` as date-keyed map
 ### 2C. Snapshot & Versioning
 - `Ctrl+Alt+N` or toolbar button saves snapshot
 - Stored as JSON: `{ timestamp, content, wordCount, cursorPos, label }`
 - Snapshot panel in sidebar: Restore, Diff (side-by-side), auto-snapshot interval
 - Snapshots in `.snapshots/` inside project folder, or app data if no project
 ### 2D. Smart Proofreading
 Delegates to AI plugin via event bus. Writing Studio provides:
 - Right-click context menu: "Check grammar", "Suggest alternatives", "Analyze readability"
 - Inline wavy underline decorations for issues
 - Proofread panel: issues categorized by type with Accept/Dismiss
 ### Commands
 | Command | Shortcut | Action |
 |---------|----------|--------|
 | `start-sprint` | `Ctrl+Alt+S` | Start writing sprint |
 | `stop-sprint` | `Ctrl+Alt+Shift+S` | Stop sprint |
 | `take-snapshot` | `Ctrl+Alt+N` | Save snapshot |
 | `restore-last-snapshot` | `Ctrl+Alt+Z` | Restore latest snapshot |
 | `new-project` | — | Create manuscript project |
 | `compile-manuscript` | `Ctrl+Alt+E` | Export all chapters |
 | `proofread-document` | `Ctrl+Alt+G` | AI proofread |
 ---
 ## 3. AI Assistant Plugin
 ### Provider Architecture
 ```
 AI Plugin
  ├── Provider Interface
  │     ├── complete(prompt, options) → string
  │     ├── stream(prompt, options) → AsyncIterable
  │     └── analyze(text, type) → AnalysisResult
  │
  ├── Providers
  │     ├── OllamaProvider      — localhost:11434
  │     ├── LMStudioProvider    — localhost:1234/v1
  │     ├── GGUFProvider         — direct llama.cpp with GPU support
  │     ├── AnthropicProvider    — Claude API
  │     └── OpenAIProvider       — GPT API
  │
  └── Features
        ├── Grammar/style check
        ├── Inline auto-complete
        ├── AI chat panel (sidebar)
        ├── Document analysis
        └── Smart commands (command palette)
 ```
 ### Provider Details
 **Ollama:** `GET /api/tags` for models, `POST /api/generate` and `POST /api/chat` for inference.
 **LMStudio:** OpenAI-compatible API at `localhost:1234/v1`. `GET /v1/models`, standard chat completion format, SSE streaming.
 **GGUF Direct (with GPU):**
 - Ships bundled llama.cpp binaries per platform (CUDA, Vulkan, Metal, CPU variants)
 - Auto-detects GPU: CUDA (nvidia-smi), Vulkan driver, Metal (macOS)
 - GPU layer offloading: configurable, auto-suggests based on VRAM vs model size
 - Settings: GPU backend selection, layer count, context length, thread count
 - "Keep model loaded" option for faster repeated requests
 - WASM fallback for sandboxed environments (CPU-only)
 - External binary path for advanced users with custom builds
 - **Process isolation**: llama.cpp runs as a spawned child process (not in main process). If it crashes, detected via exit handler, auto-restarted with notification. GPU memory freed on crash. App remains stable.
 - Process management: spawn in server mode on localhost ephemeral port, clean up on app quit or model unload
 **Cloud (Anthropic/OpenAI):**
 - API key stored encrypted via electron safeStorage
 - Token usage tracking with estimated cost
 - Rate limit awareness with request queueing and backoff
 ### IPC Design
 All provider HTTP requests go through main process:
 - No CORS issues
 - API keys never in renderer
 - Main process enforces rate limiting
 - GGUF inference in isolated child process
 **Request/response lifecycle:**
 ```
 Renderer → ipc.invoke('ai:complete') → Main → HTTP to provider → result → Renderer
 ```
 **Streaming lifecycle with error handling:**
 ```
 Renderer → ipc.invoke('ai:stream', { requestId, prompt })
         ← Main assigns requestId, returns { requestId }
         ← ipc.on('ai:chunk', { requestId, text }) — repeated
         ← ipc.on('ai:done', { requestId }) — success
         ← ipc.on('ai:error', { requestId, error }) — failure
 // Cancellation
 Renderer → ipc.invoke('ai:cancel', { requestId })
         ← Main aborts HTTP request, emits 'ai:done'
 // Orphan cleanup: if renderer disconnects (crash/close),
 // main process detects via 'render-view-deleted' and aborts all active streams.
 // Heartbeat: if no chunk received in 30s, main emits 'ai:error' with timeout.
 ```
 ### Features
 1. **Inline suggestions**: ghost text after configurable delay, Tab to accept, Esc to dismiss
 2. **AI chat panel**: sidebar conversation, "Insert" / "Replace selection" buttons
 3. **Document analysis**: grammar, style, tone, with accept/reject per suggestion
 4. **Smart commands**: summarize, generate outline, find inconsistencies, translate, explain code
 ### Privacy
 - Local-first: default provider is Ollama
 - No telemetry: requests go direct to provider
 - Content gating: exclude file types from AI
 - Status bar shows "AI: processing..." with cancel option
 - Cloud usage stats in settings (tokens, cost)
 ### Cross-Plugin Integration
 ```javascript
 // Writing Studio calls AI Plugin
 context.events.emit('ai:analyze', { text, type: 'grammar', callback });
 ```
 ---
 ## 4. Collaboration Plugin
 ### 4A. Enhanced Git Panel
 Upgrades to existing git panel:
 - Remote management (add/remove remotes, push/pull)
 - Branch list and switching
 - Commit history with diff viewer (side-by-side or unified)
 - Conflict resolution UI (accept-ours/accept-theirs/per-edit)
 ### 4B. Shared Repository Workflow
 1. Writer A creates project + initializes git + pushes to shared repo
 2. Writer B clones repo from within MarkdownConverter
 3. Both write on their own branches
 4. Writer A creates review request (simplified PR)
 Review request: changed files, word count diff, commit messages. Reviewer can approve, request changes, leave inline comments. Reviews are git branches + comments as git notes.
 ### 4C. Comments & Annotations
 Inline comments stored as JSON in `.comments/` directory (git-tracked):
 ```json
 {
  "id": "uuid",
  "file": "03-chapter-three.md",
  "anchor": {
    "contextBefore": "The hero looked at the horizon and said,",
    "selectedText": "I will not go quietly into that dark night",
    "contextAfter": "He turned to face the army alone."
  },
  "line": 142,
  "text": "This dialogue feels unnatural",
  "author": "amit",
  "timestamp": "2026-04-14T14:30:00Z",
  "replies": [],
  "resolved": false
 }
 ```
 - **Anchor-based positioning**: comments store `contextBefore`, `selectedText`, and `contextAfter` (not absolute byte offsets). On file change, re-anchor by searching for the context text. If context no longer matches, mark comment as "detached" and show a warning. Falls back to `line` number as rough position.
 - Highlighted text in editor with tooltip on hover
 - Comment panel in sidebar: all unresolved comments across files
 - Resolution workflow: add → address → reply → resolve
 - Resolved comments dim but stay visible
 ### 4D. Change Notifications
 - Status bar indicator: `↓ 3 new commits`
 - Click to see changes, one-click pull
 - Conflicts trigger resolution UI
 - Push button only when local commits ahead of remote
 ### 4E. Offline-First
 All writing happens locally. Git is the sync mechanism. No internet required for writing, commenting, snapshots, or sprints. Push/pull on user action or auto-sync setting.
 ### Commands
 | Command | Shortcut | Action |
 |---------|----------|--------|
 | `collab:commit` | `Ctrl+Shift+G` | Commit with message |
 | `collab:push` | — | Push current branch |
 | `collab:pull` | — | Pull from remote |
 | `collab:add-comment` | `Ctrl+Alt+C` | Comment on selection |
 | `collab:next-comment` | `F8` | Next unresolved comment |
 | `collab:prev-comment` | `Shift+F8` | Previous comment |
 | `collab:create-review` | — | Create review request |
 ### Cross-Plugin Integration
 ```javascript
 context.events.emit('snapshot:created', { file, snapshotId });
 context.events.on('project:chapter-opened', (chapter) => { /* load comments */ });
 context.events.on('comment:added', (comment) => { /* AI could suggest fix */ });
 ```
 ---
 ## Bundle Size Impact
 - llama.cpp binaries: ~15MB per GPU variant. Only target platform shipped. GPU variants (CUDA/Vulkan/Metal) downloaded on demand if user enables GGUF direct loading — not bundled by default. Only CPU fallback bundled (~15MB).
 - Plugin system core: ~30KB
 - Each built-in plugin: ~50-100KB
 - Diff library (jsdiff): ~15KB
 - Total estimated increase: ~20-30MB (core), additional ~30-50MB per GPU variant (lazy download)
 ## Testing Strategy
 - Plugin system: unit tests for registry, loader, context API mocking
 - Each plugin: isolated unit tests, integration tests via plugin context
 - AI provider tests: mock HTTP responses, test streaming parsing
 - Git tests: use test repository fixture
 - E2E: verify plugin loading doesn't break existing features
@@ -1,361 +0,0 @@
 # MarkdownConverter — React + shadcn/ui UI Redesign
 **Date:** 2026-06-05
 **Status:** Design (awaiting user approval)
 **Branch:** `react-electron`
 **Author:** Brainstormed with user via superpowers:brainstorming
 ## Summary
 Replace the legacy vanilla JS renderer (`src/renderer.js` is 213 KB; `src/styles.css` is 74 KB) with a modern React 19 + Vite + TypeScript + shadcn/ui renderer that achieves visual feature parity while delivering a Polished + Glassy (Raycast/Arc-style) aesthetic. The Electron main process, preload bridge, and IPC contracts stay unchanged. Work proceeds via vertical slices — each PR ships a demoable feature.
 ## Goals
 1. Replace every render-time feature of the legacy renderer with an idiomatic React + shadcn/ui implementation.
 2. Adopt the "Polished + Glassy" visual language (subtle shadows, 8–12 px radii, gradient accents, gentle depth) on top of the existing ConcreteInfo brand tokens and design system.
 3. Use a single component foundation (shadcn/ui) and a single motion library (Motion / Framer Motion) to keep the dependency surface narrow and the design coherent.
 4. Keep the main process, preload, and IPC contracts untouched. The renderer is the only surface being rewritten.
 5. Keep the app runnable at every commit. No "big bang" merge.
 ## Non-Goals
 - Migrating the main process to TypeScript (out of scope for this spec).
 - Adding new features the legacy renderer does not have (plugin system, AI features, etc. — those are future specs).
 - Replacing Pandoc/FFmpeg/ImageMagick orchestration.
 - Changing the packaging pipeline (electron-builder config stays).
 - Replacing the CodeMirror 6 editor — it is the right tool and is already wired up.
 ## Decisions Locked During Brainstorming
 | Decision | Choice | Why |
 |---|---|---|
 | Scope | Full feature parity with legacy renderer | User-selected option. Renderer is one cohesive surface; splitting it across specs would force premature contracts. |
 | Visual style | **B — Polished + Glassy** (Raycast/Arc aesthetic) | "Fancy" comes from elevation, gradient accents, and material depth — not over-designed visuals. |
 | Layout | **2 — IDE-style** (equal editor/preview, draggable divider, collapsible sidebar) | Power-user markdown apps converge on this. Draggable divider + keyboard reset. |
 | Modal patterns | **A (Centered Dialog), B (Right Side-Sheet), D (Toasts)** | No command palette. |
 | Command palette | **No** — full menus, no ⌘K | Power users can use the OS-level launcher. App stays focused on writing. |
 | Animation | **Motion (Framer Motion)** | Best for layout transitions, modal/drawer enter/exit, drag. Sparingly used. |
 | Component library | **shadcn/ui** | Tailwind + Radix primitives, copy-paste ownership, perfect fit for the "glassy" aesthetic and the HSL-CSS-variable foundation that is already in place. |
 | Implementation strategy | **Vertical slices** — one feature end-to-end per PR | App stays runnable. Each PR is reviewable. |
 ## Defaults (Used Unless Overridden Later)
 | Item | Default | Why |
 |---|---|---|
 | State management | Zustand (already in deps) + Immer for nested patches | Already in `package.json`; perfect for editor state. |
 | Theming | shadcn `next-themes`, dark default + light, system-aware | shadcn canonical pattern. Brand colors already in CSS vars. |
 | Icons | `lucide-react` (already in deps) | 1000+ tree-shakable icons. |
 | Forms | `react-hook-form` + `zod` | Standard for shadcn forms. |
 | Drag/drop (sortable lists) | `@dnd-kit/core` | De facto React drag lib (file tree reordering, plugin list reorder). |
 | Pane resize (split layout) | `react-resizable-panels` | Canonical React lib for resizable pane groups; handles drag, arrow keys, snap, persisted sizes. |
 | Testing | Vitest + RTL + Playwright (E2E + visual regression) | Standard for React + Electron. |
 | TypeScript | Strict mode (already wired) | Already in deps and `vite.renderer.config.ts`. |
 ## Architecture
 The Electron app keeps its existing process model. Only the renderer is rewritten.
 ```
 ┌──────────────────────────────────────────────────────────┐
 │  Electron Main (UNCHANGED)                                │
 │  - BrowserWindow, IPC handlers, file/fs ops               │
 │  - Pandoc, FFmpeg, ImageMagick orchestration              │
 └────────────┬─────────────────────────────────────────────┘
             │ contextBridge (UNCHANGED preload.js)
 ┌────────────▼─────────────────────────────────────────────┐
 │  React Renderer (REWRITTEN)                                │
 │  ┌────────────────────────────────────────────────────┐  │
 │  │  AppShell (layout)                                  │  │
 │  │  ├─ MenuBar (native)                                │  │
 │  │  ├─ AppHeader (logo, breadcrumbs, theme toggle)     │  │
 │  │  ├─ TabBar (open files)                             │  │
 │  │  ├─ Toolbar (formatting)                            │  │
 │  │  ├─ ResizablePaneGroup (sidebar | editor | preview) │  │
 │  │  │   ├─ Sidebar (file tree, outline)                │  │
 │  │  │   ├─ EditorPane (CodeMirror 6)                   │  │
 │  │  │   └─ PreviewPane (marked + KaTeX + Mermaid)      │  │
 │  │  ├─ StatusBar (word count, encoding, cursor pos)    │  │
 │  │  └─ ModalLayer (Dialog, SideSheet, Toaster)         │  │
 │  └────────────────────────────────────────────────────┘  │
 │  ┌────────────────────────────────────────────────────┐  │
 │  │  Feature Modules (each owns UI + state slice)       │  │
 │  │  ├─ editor/    CodeMirror wrapper, syntax, themes   │  │
 │  │  ├─ preview/   markdown→html, KaTeX, Mermaid       │  │
 │  │  ├─ tabs/      open files, dirty state              │  │
 │  │  ├─ sidebar/   file tree, outline, search results   │  │
 │  │  ├─ modals/    export, settings, about, etc.        │  │
 │  │  ├─ tools/     zen, repl, ascii-gen, table-gen      │  │
 │  │  └─ export/    pdf, docx, html, image batch         │  │
 │  └────────────────────────────────────────────────────┘  │
 │  ┌────────────────────────────────────────────────────┐  │
 │  │  Shared Infrastructure                              │  │
 │  │  ├─ stores/  Zustand slices per feature             │  │
 │  │  ├─ hooks/   useFile, useEditor, useTheme, etc.     │  │
 │  │  ├─ lib/     cn, ipc, formatters, validators        │  │
 │  │  ├─ ui/      shadcn primitives: button, dialog…     │  │
 │  │  └─ types/   shared TS types                        │  │
 │  └────────────────────────────────────────────────────┘  │
 └──────────────────────────────────────────────────────────┘
 ```
 ### Architectural Rules
 - **Shell components** (`AppHeader`, `TabBar`, `StatusBar`) subscribe only to `useAppStore`.
 - **Feature components** subscribe to their own feature's store.
 - **Cross-feature access** goes through hooks, not direct store imports (e.g., `useFileTree()` wraps `useFileStore`).
 - **Feature modules are self-contained** — each owns its components, its Zustand slice, and its types. Safe to develop in parallel later.
 - **No direct `window.electronAPI` calls** from feature code. All IPC goes through `lib/ipc.ts` for type safety and error normalization.
 ## State Management
 ```
 stores/
 ├─ useAppStore        // global UI: theme, sidebar, pane sizes, modals open
 ├─ useFileStore       // file system: tree, open files, active tab
 ├─ useEditorStore     // editor: per-file content, cursor, selection, dirty
 ├─ usePreviewStore    // preview: scroll sync, zoom, theme
 ├─ useSettingsStore   // user prefs (persisted to electron-store)
 └─ useCommandStore    // menu actions registry, recent actions
 ```
 **Why slices instead of one mega-store?** Editor content can be megabytes. Keeping it in its own slice lets React avoid re-rendering the preview when only the editor changes — components subscribe with selectors.
 **Persistent state** (auto-saved to electron-store via Zustand `persist` middleware): theme, sidebar visibility, last open files, pane divider positions, settings.
 **Ephemeral state** (lost on quit): active modal, hover states, search query, current file content (saved to disk on idle).
 ## Visual Design System
 ### Color Tokens
 The existing `globals.css` HSL variables stay. Additions for the "glassy" aesthetic:
 ```css
 --shadow-sm: 0 1px 2px rgba(13, 11, 9, 0.06);
 --shadow-md: 0 4px 12px rgba(13, 11, 9, 0.08), 0 0 0 1px rgba(13, 11, 9, 0.04);
 --shadow-lg: 0 12px 32px rgba(13, 11, 9, 0.12), 0 0 0 1px rgba(13, 11, 9, 0.06);
 --shadow-glow-brand: 0 0 24px rgba(229, 70, 31, 0.25);
 --glass-bg-light: rgba(255, 255, 255, 0.72);
 --glass-bg-dark:  rgba(13, 11, 9, 0.72);
 --glass-border-light: rgba(255, 255, 255, 0.4);
 --glass-border-dark:  rgba(255, 255, 255, 0.08);
 ```
 ### shadcn Components
 Install via `npx shadcn@latest add`:
 **Primitives** (need all of these): `button`, `dialog`, `sheet`, `popover`, `tooltip`, `select`, `dropdown-menu`, `tabs`, `separator`, `scroll-area`, `toggle`, `switch`, `slider`, `input`, `textarea`, `label`, `form`, `skeleton`, `sonner`, `command`.
 **Composite** (custom-built on top of primitives): `file-tree`, `pane-group`, `divider`, `status-bar`, `menu-bar`, `toast`.
 ### Typography
 - Body: Plus Jakarta Sans 15 px / line-height 1.6
 - Code: JetBrains Mono 13.5 px
 - Display: Barlow Condensed 700/800 — used sparingly (page titles, big metrics)
 - Headings: Plus Jakarta Sans 600/700 with tight letter-spacing
 - Labels (`.label`): Plus Jakarta Sans 500, 12 px, uppercase, 0.05 em letter-spacing
 ### Motion Choreography
 | Element | Motion | Duration | Easing |
 |---|---|---|---|
 | Modal (Dialog A) | Scale 0.96→1, opacity 0→1 | 200 ms | `ease-out` |
 | Side sheet (B) | TranslateX 100%→0, opacity 0→1 | 300 ms | `cubic-bezier(0.16, 1, 0.3, 1)` |
 | Toast | TranslateY 100%→0, opacity | 250 ms | spring(stiffness: 300, damping: 30) |
 | Sidebar toggle | Width 264 px↔72 px, content fade | 250 ms | `ease-in-out` |
 | Divider drag | Live width update | 0 ms | none (instant) |
 | Theme switch | CSS variables, opacity overlay | 300 ms | `ease-in-out` |
 | Tab switch | Underline slide | 200 ms | `ease-out` |
 | Hover (buttons) | `bg` + `shadow` shift | 150 ms | `ease-out` |
 | Focus ring | Outline grow | 100 ms | `ease-out` |
 **Rules:** Every motion has a purpose. No gratuitous animation. Respects `prefers-reduced-motion` (Motion handles this automatically).
 ### Empty / Loading / Error States
 Every async surface ships all three. Sonner toasts for ephemeral feedback. Skeleton screens for content areas. Empty-state components with icon + message + primary CTA.
 ## Modal/Overlay Patterns
 | Use case | Pattern | Why |
 |---|---|---|
 | Export (PDF/DOCX/HTML) | A — Centered Dialog | Focused decision, ~3–5 fields, "do one thing" |
 | Settings | B — Right Side-Sheet | Long form, tabbed sections, stays open while editing |
 | Find/Replace | Inline toolbar (not modal) | Always-visible utility |
 | About | A — Centered Dialog | Tiny info dump |
 | Confirm destructive (delete, close unsaved) | A — Centered Dialog | Forces attention |
 | File save error | D — Toast | Non-blocking info |
 | Pandoc/FFmpeg progress | D — Toast → sticky on >3 s | Background work feedback |
 | Plugin manager | B — Right Side-Sheet | Lists + per-item actions |
 | ASCII/Table generators | A — Centered Dialog | Tool-style focused input → output |
 | Print preview | A — Centered Dialog | Full-screen-ish modal overlay |
 | Welcome (first launch) | A — Centered Dialog | One-time onboarding |
 | Word export | A — Centered Dialog | Template selection |
 | Zen mode | Full-viewport toggle (no modal) | Replaces the editor entirely |
 | REPL | Bottom-pinned panel (split-pane) | Persistent terminal-like UI |
 | Quick file open | B — Right Side-Sheet | File tree, search, recent |
 ### Dialog A Anatomy (Export as example)
 ```
 ┌─ Backdrop (rgba(13,11,9,0.45) + backdrop-blur 4px) ─────────┐
 │                                                            │
 │   ┌──── Modal (max-w-md, rounded-2xl, shadow-lg) ─────┐    │
 │   │ ┌── Header ────────────────────────────────────┐  │    │
 │   │ │ [Icon] Export as PDF                  [×]    │  │    │
 │   │ │ Choose format options                       │  │    │
 │   │ └─────────────────────────────────────────────┘  │    │
 │   │ ┌── Body ──────────────────────────────────────┐  │    │
 │   │ │ Format: [Letter] [A4] [Legal]                │  │    │
 │   │ │ Margins: ────●────                           │  │    │
 │   │ │ ☐ Include table of contents                  │  │    │
 │   │ │ ☐ Embed fonts                                │  │    │
 │   │ └─────────────────────────────────────────────┘  │    │
 │   │ ┌── Footer ────────────────────────────────────┐  │    │
 │   │ │                       [Cancel] [Export →]    │  │    │
 │   │ └─────────────────────────────────────────────┘  │    │
 │   └──────────────────────────────────────────────────┘    │
 │                                                            │
 └────────────────────────────────────────────────────────────┘
 ```
 ### Side-Sheet B Anatomy (Settings as example)
 Slides in from right, ~50 % width (max 560 px). Backdrop is `rgba(13,11,9,0.2)` with `backdrop-blur(2 px)` (lighter than dialog — the sheet is the focus). Tab navigation in the sheet header (Editor / Theme / Export / Plugins / About).
 ### Toast D Anatomy (Sonner)
 Stacked bottom-right, max 3 visible. Glass background. Color-coded 3 px left border — success `#1a7a56`, error `#ef4444`, info `#0ea5e9`, warning `#eab308`. Icon + title + description. Optional action button. Auto-dismiss 4 s for success, sticky for error.
 ## Data Flow (Editor → Preview Pipeline)
 ```
 User types
  ↓
 CodeMirror onChange
  ↓
 useEditorStore.updateContent(tabId, content)  ← debounced 50 ms
  ↓
 ┌─ Persist to electron-store on idle (1 s) ─┐
 │                                            │
 └─ Publish to usePreviewStore (subscribed) ─┘
  ↓
 marked(content) → sanitized HTML
  ↓
 PreviewPane renders HTML
  KaTeX post-processes $...$
  Mermaid post-processes ```mermaid
  Highlight.js post-processes ```lang
  ↓
 useEffect: scroll-sync editor cursor → preview position
 ```
 **Bidirectional scroll sync:** editor scroll → preview (primary), preview click → editor cursor (secondary). Throttled to 60 fps via `requestAnimationFrame`.
 ## IPC Contract
 The preload bridge stays unchanged. A new `src/renderer/lib/ipc.ts` wraps every channel with TypeScript types and normalizes errors to a discriminated union:
 ```ts
 type IpcResult<T> =
  | { ok: true; data: T }
  | { ok: false; error: { code: string; message: string } };
 export const ipc = {
  file: {
    open: (): Promise<IpcResult<FileResult>>,
    read: (path: string): Promise<IpcResult<string>>,
    write: (path: string, content: string): Promise<IpcResult<void>>,
    list: (dir: string): Promise<IpcResult<FileEntry[]>>,
    onChange: (cb: (path: string) => void) => () => void,
  },
  export: {
    pdf: (opts: PdfOptions): Promise<IpcResult<ExportResult>>,
    docx: (opts: DocxOptions): Promise<IpcResult<ExportResult>>,
    html: (opts: HtmlOptions): Promise<IpcResult<ExportResult>>,
    batch: (items: BatchItem[], opts: BatchOptions): Promise<IpcResult<BatchResult>>,
  },
  app: {
    getVersion: (): Promise<IpcResult<string>>,
    openExternal: (url: string): Promise<IpcResult<void>>,
    showItemInFolder: (path: string): Promise<IpcResult<void>>,
  },
 };
 ```
 ## Error Handling
 Layered defense — no single failure can crash the app:
 1. **IPC errors** → caught in `lib/ipc.ts` wrapper, returned as `IpcResult<T>` discriminated union. Components show toast on error.
 2. **Component errors** → React error boundary per feature area (one for editor, one for preview, one for modals). On error: show inline error UI with "Reload this panel" + "Copy details" actions.
 3. **Async operations** (export, file ops) → loading state on button + toast on completion. Long ops (>2 s) get a sticky toast with cancel.
 4. **Validation errors** (settings, export options) → inline form errors via `react-hook-form` + `zod`. shadcn `Form` component for consistent error display.
 5. **Pandoc/FFmpeg missing** → detected at startup, banner + disable export menu items. Don't surprise-fail at export time.
 ## Testing Strategy
 - **Unit (Vitest):** stores, hooks, lib utilities, formatters, validators
 - **Component (Vitest + RTL):** shadcn wrappers, dialog interactions, sidebar toggle, divider drag, theme toggle
 - **Integration (Vitest + RTL):** editor ↔ preview flow, file open → tab add → content display, settings change persists
 - **E2E (Playwright):** app launches, file opens, markdown renders, export to PDF works
 - **Visual regression (Playwright snapshots):** locked-in screenshots for header, sidebar, dialogs, toasts — catch accidental style drift
 - **Target coverage:** stores/hooks/lib ≥ 90 %, components ≥ 75 %, E2E covers all critical paths
 ## Accessibility (WCAG 2.1 AA)
 Baked in via shadcn + Radix:
 - All dialogs focus-trap, Esc to close, return focus to trigger
 - All interactive elements keyboard-reachable
 - Visible focus rings (2 px brand ring)
 - 4.5:1 contrast minimum (already met by brand colors)
 - `aria-label` on icon buttons, `role="alert"` on toasts
 - Respects `prefers-reduced-motion` (Motion handles this automatically)
 ## Implementation Phases (Vertical Slices)
 Each phase is a shippable PR that keeps the app runnable. The legacy `renderer.js` is gradually replaced; until each phase is complete, the old renderer code still runs the missing parts.
 | # | Phase | Output | Acceptance |
 |---|---|---|---|
 | 1 | **Foundation** | shadcn installed; `next-themes`, `motion`, `react-hook-form`, `zod`, `@dnd-kit/core`, `react-resizable-panels`, `sonner` installed; design tokens finalized; `lib/utils.ts` (`cn`), `lib/ipc.ts` typed wrappers, `lib/motion.ts` preset transitions, `App.tsx` shell skeleton renders | `npm run build` succeeds; dev server shows the new shell with theme toggle working |
 | 2 | **App shell + layout** | `AppHeader`, `TabBar`, `Toolbar`, `Breadcrumb`, `StatusBar`, `ResizablePaneGroup` with sidebar toggle and draggable divider. Empty editor/preview panes. | Resize divider with mouse and arrow keys; sidebar collapses; pane sizes persist. |
 | 3 | **Editor pane** | CodeMirror 6 wrapped, dark/light themes wired to shadcn theme, syntax highlighting, line numbers, search, autocomplete | Open `.md` file → renders in editor; can edit and save. |
 | 4 | **Preview pane** | marked + DOMPurify + KaTeX + Mermaid + highlight.js. Bidirectional scroll sync with editor. | Open file → preview renders, follows cursor. |
 | 5 | **File tree + tabs** | Sidebar file tree (read directory on demand, lazy-expand children only on click). Tabs for open files. Dirty state indicator. File content is read from disk only when the tab is activated. | Open folder → root populates; click folder → children load; click file → opens in tab; close tab reverts dirty. |
 | 6 | **Native menus + toolbar** | Replace the legacy `CommandPalette` with full menus (File / Edit / View / Insert / Format / Tools / Help) bound to keyboard shortcuts. Toolbar buttons. | All menu items invoke the right action; shortcuts work; toolbar reflects active state. |
 | 7 | **Modals** | Export dialog (PDF/DOCX/HTML/batch), Settings side-sheet (Editor/Theme/Export/Plugins/About tabs), About dialog, Confirm-destructive dialog | All dialogs and sheet render with proper motion; settings persist; export works end-to-end. |
 | 8 | **Toasts** | Sonner wired into all async operations (save, export, errors, tool missing) | All operations give appropriate feedback; no silent failures. |
 | 9 | **Advanced tools** | Zen mode (full-viewport toggle), REPL (bottom-pinned panel), ASCII generator, Table generator, Word export template picker, Print preview | Each tool is feature-complete vs. legacy version. |
 | 10 | **Polish + delete legacy** | Visual regression snapshots locked; remove `renderer.js` and old `styles*.css` references from build; `npm run build:linux` produces a working installer | Final PR ships an installer with no legacy code paths. |
 ## Risks and Mitigations
 | Risk | Mitigation |
 |---|---|
 | shadcn CLI requires Vite (not vanilla Electron renderer) | Vite is already configured for the renderer in `vite.renderer.config.ts`; the CLI works against the same project. |
 | shadcn CLI assumes Tailwind is at project root; we have it in renderer/ only | Point the CLI at `src/renderer/components.json` and set `tailwind.css` to the right path. |
 | Marked + KaTeX + Mermaid + highlight.js together is heavy | Lazy-load Mermaid (only when `mermaid` code block encountered). KaTeX is loaded once, cached. |
 | Editor content state can be megabytes → re-render storms | Editor content lives in its own slice; preview subscribes to a derived/cached HTML string; components use `useShallow` / selector subscriptions. |
 | Bidirectional scroll sync loops | `useEffect` debounce + ignore if cursor/selection is the sync source. |
 | CodeMirror 6 doesn't ship a Tailwind theme by default | Use `@codemirror/theme-one-dark` for dark; build a custom theme that pulls from CSS variables for light. |
 | The legacy `renderer.js` and `styles*.css` are referenced from `index.html` (now `src/renderer/index.html`) | Phase 10 deletes the references; until then, both run side-by-side and the new React app sits in a known root div. |
 | Electron `nodeIntegration` is off; we use contextBridge | Already the case. Document the contract clearly in `lib/ipc.ts`. |
 ## Open Questions (to confirm before implementation)
 None. All major decisions are locked. Defaults will be used unless the user overrides them when reviewing the implementation plan.
 ## References
 - `src/renderer.js` (213 KB) — legacy renderer being replaced
 - `src/styles.css` (74 KB), `src/styles-modern.css` (71 KB), `src/styles-concreteinfo.css` (21 KB) — legacy styles being replaced
 - `src/renderer/styles/globals.css` — already shadcn-compatible (HSL CSS variables)
 - `src/renderer/App.tsx` — empty skeleton that references components we will build
 - `tailwind.config.js` — brand colors and fonts already defined
 - `vite.renderer.config.ts` — Vite + React plugin already configured
 - `package.json` — CodeMirror 6, TanStack Table, lucide-react, cva, clsx, tailwind-merge, tailwindcss-animate already installed
@@ -1,112 +0,0 @@
 /**
 * ESLint Configuration for PanConverter
 * Uses flat config format (ESLint 9+)
 */
 module.exports = [
  {
    // Global ignores
    ignores: [
      'node_modules/**',
      'dist/**',
      'coverage/**',
      '*.min.js'
    ]
  },
  {
    // JavaScript files
    files: ['**/*.js'],
    languageOptions: {
      ecmaVersion: 2022,
      sourceType: 'module',
      globals: {
        // Node.js
        require: 'readonly',
        module: 'readonly',
        exports: 'readonly',
        __dirname: 'readonly',
        __filename: 'readonly',
        process: 'readonly',
        Buffer: 'readonly',
        console: 'readonly',
        setTimeout: 'readonly',
        setInterval: 'readonly',
        clearTimeout: 'readonly',
        clearInterval: 'readonly',
        // Browser
        window: 'readonly',
        document: 'readonly',
        localStorage: 'readonly',
        alert: 'readonly',
        prompt: 'readonly',
        confirm: 'readonly',
        Event: 'readonly',
        CustomEvent: 'readonly',
        HTMLElement: 'readonly',
        MutationObserver: 'readonly',
        TextEncoder: 'readonly',
        FileReader: 'readonly',
        requestAnimationFrame: 'readonly',
        cancelAnimationFrame: 'readonly',
        navigator: 'readonly',
        location: 'readonly',
        fetch: 'readonly',
        URL: 'readonly',
        Blob: 'readonly',
        Image: 'readonly',
        DragEvent: 'readonly',
        ClipboardEvent: 'readonly',
        KeyboardEvent: 'readonly',
        MouseEvent: 'readonly',
        NodeList: 'readonly',
        HTMLInputElement: 'readonly',
        HTMLTextAreaElement: 'readonly',
        getComputedStyle: 'readonly',
        // Electron
        electronAPI: 'readonly',
        // Libraries
        marked: 'readonly',
        DOMPurify: 'readonly',
        hljs: 'readonly',
        mermaid: 'readonly',
        // Node.js global object
        global: 'writable',
        // Jest
        jest: 'readonly',
        describe: 'readonly',
        test: 'readonly',
        it: 'readonly',
        expect: 'readonly',
        beforeEach: 'readonly',
        afterEach: 'readonly',
        beforeAll: 'readonly',
        afterAll: 'readonly'
      }
    },
    rules: {
      // Error prevention
      'no-unused-vars': ['warn', { argsIgnorePattern: '^_' }],
      'no-undef': 'error',
      'no-console': 'off', // Allow console for Electron apps
      // Code quality
      'eqeqeq': ['warn', 'always'],
      'no-var': 'warn',
      'prefer-const': 'warn',
      // Style (handled by Prettier)
      'semi': 'off',
      'quotes': 'off',
      'indent': 'off',
      // Async handling
      'no-async-promise-executor': 'warn',
      'require-await': 'off',
      // Security
      'no-eval': 'error',
      'no-implied-eval': 'error',
      'no-new-func': 'error'
    }
  }
 ];
@@ -1,61 +0,0 @@
 /**
 * Jest Configuration for PanConverter
 * @version 2.2.0
 */
 module.exports = {
  // Test environment
  testEnvironment: 'jsdom',
  // Root directory
  rootDir: '.',
  // Test file patterns
  testMatch: [
    '**/tests/**/*.test.js',
    '**/tests/**/*.spec.js'
  ],
  // Coverage configuration
  collectCoverageFrom: [
    'src/**/*.js',
    '!src/main.js', // Main process needs electron-mock
    '!src/renderer.js', // Large renderer file with duplicate declarations
    '!src/preload.js', // Electron preload requires contextBridge
    '!**/node_modules/**'
  ],
  // Coverage thresholds (raised with expanded test suite)
  coverageThreshold: {
    global: {
      branches: 10,
      functions: 15,
      lines: 15,
      statements: 15
    }
  },
  // Transform settings (no transpilation needed for vanilla JS)
  transform: {},
  // Module paths
  moduleDirectories: ['node_modules', 'src'],
  // Setup files
  setupFilesAfterEnv: ['<rootDir>/tests/setup.js'],
  // Ignore patterns
  testPathIgnorePatterns: [
    '/node_modules/',
    '/dist/'
  ],
  // Verbose output
  verbose: true,
  // Clear mocks between tests
  clearMocks: true,
  // Reset modules between tests
  resetModules: true
 };
@@ -1,123 +1,53 @@
 {
-  "name": "markdown-converter",
+  "name": "pan-converter",
-  "version": "4.4.2",
+  "version": "1.9.0",
-  "description": "Professional Markdown editor and universal file converter with PDF editing, batch processing, and syntax highlighting",
+  "description": "Cross-platform Markdown editor and converter using Pandoc",
  "main": "src/main.js",
  "scripts": {
    "start": "electron .",
-    "test": "jest",
+    "test": "echo \"Error: no test specified\" && exit 1",
    "test:watch": "jest --watch",
    "test:coverage": "jest --coverage",
    "lint": "eslint src tests",
    "lint:fix": "eslint src tests --fix",
    "format": "prettier --write src tests",
    "format:check": "prettier --check src tests",
    "build": "electron-builder",
-    "build:win": "electron-builder --win",
+    "build:win": "cross-env CSC_LINK=code-signing-cert.pfx CSC_KEY_PASSWORD=PanConverter2024! electron-builder --win",
    "build:win-signed": "cross-env CSC_LINK=code-signing-cert.pfx electron-builder --win",
    "build:win-unsigned": "cross-env CSC_IDENTITY_AUTO_DISCOVERY=false electron-builder --win",
    "create-cert": "powershell -ExecutionPolicy Bypass -File scripts/create-selfsigned-cert.ps1",
    "build:mac": "electron-builder --mac",
    "build:linux": "electron-builder --linux",
    "build:linux-ci": "electron-builder --linux deb AppImage",
    "build:local": "electron-builder --linux --win",
    "dist": "electron-builder --publish=never",
    "dist:all": "electron-builder -mwl",
    "download-tools": "node scripts/download-tools.js",
    "generate-icons": "node scripts/generate-icons.js"
  },
  "keywords": [
    "markdown",
    "pandoc",
    "converter",
-    "editor",
+    "editor"
    "pdf",
    "audio",
    "video",
    "image"
  ],
-  "author": "ConcreteInfo <amit.wh@gmail.com>",
+  "author": "Amit Haridas <amit.wh@gmail.com>",
  "license": "MIT",
  "repository": {
    "type": "git",
    "url": "https://github.com/amitwh/markdown-converter"
  },
  "devDependencies": {
    "@testing-library/dom": "^10.4.1",
    "@types/react": "^19.2.16",
    "@types/react-dom": "^19.2.3",
    "@vitejs/plugin-react": "^6.0.2",
    "autoprefixer": "^10.5.0",
    "class-variance-authority": "^0.7.1",
    "clsx": "^2.1.1",
    "cross-env": "^10.0.0",
-    "electron": "^41.1.1",
+    "electron": "^37.4.0",
    "electron-builder": "^26.0.12",
-    "eslint": "^9.39.2",
+    "sharp": "^0.34.3"
    "eslint-config-prettier": "^10.1.8",
    "eslint-plugin-prettier": "^5.5.4",
    "jest": "^30.2.0",
    "jest-environment-jsdom": "^30.2.0",
    "lucide-react": "^1.17.0",
    "postcss": "^8.5.15",
    "prettier": "^3.7.4",
    "sharp": "^0.34.3",
    "tailwind-merge": "^3.6.0",
    "tailwindcss": "^3.4.19",
    "tailwindcss-animate": "^1.0.7",
    "typescript": "^6.0.3",
    "vite": "^8.0.16"
  },
  "dependencies": {
    "@codemirror/autocomplete": "^6.20.1",
    "@codemirror/commands": "^6.10.2",
    "@codemirror/lang-css": "^6.3.1",
    "@codemirror/lang-html": "^6.4.11",
    "@codemirror/lang-javascript": "^6.2.5",
    "@codemirror/lang-json": "^6.0.2",
    "@codemirror/lang-markdown": "^6.5.0",
    "@codemirror/lang-python": "^6.2.1",
    "@codemirror/language": "^6.12.2",
    "@codemirror/lint": "^6.9.5",
    "@codemirror/search": "^6.6.0",
    "@codemirror/state": "^6.5.4",
    "@codemirror/theme-one-dark": "^6.1.3",
    "@codemirror/view": "^6.39.16",
    "@tanstack/react-table": "^8.21.3",
    "codemirror": "^6.0.2",
    "core-util-is": "^1.0.3",
-    "docx": "^9.6.0",
+    "docx": "^9.5.1",
-    "docx4js": "^2.0.1",
+    "docx4js": "^3.3.0",
-    "dompurify": "^3.3.1",
+    "dompurify": "^3.2.6",
    "electron-store": "^10.1.0",
    "ffmpeg-static": "^5.3.0",
    "highlight.js": "^11.11.1",
-    "html2pdf.js": "^0.14.0",
+    "html2pdf.js": "^0.10.1",
-    "marked": "^17.0.3",
+    "marked": "^16.2.1",
    "marked-footnote": "^1.4.0",
    "marked-highlight": "^2.2.3",
    "mermaid": "^11.12.3",
    "pdf-lib": "^1.17.1",
-    "pdfjs-dist": "^5.5.207",
+    "pdfkit": "^0.14.0",
    "pdfkit": "^0.17.2",
    "pizzip": "^3.2.0",
    "react": "^19.2.7",
    "react-dom": "^19.2.7",
    "simple-git": "^3.32.3",
    "tslib": "^2.8.1",
-    "zustand": "^5.0.14"
+    "xlsx": "^0.18.5"
  },
  "overrides": {
    "jszip": "^3.10.1",
    "nth-check": "^2.1.1",
    "lodash.pick": "npm:lodash@^4.17.21",
    "lodash-es": "^4.18.1",
    "lodash": "^4.17.21"
  },
  "build": {
-    "appId": "com.concreteinfo.markdownconverter",
+    "appId": "com.panconverter.app",
-    "productName": "MarkdownConverter",
+    "productName": "PanConverter",
    "copyright": "Copyright (C) 2024-2025 ConcreteInfo",
    "directories": {
      "output": "dist"
    },
@@ -129,10 +59,6 @@
      "node_modules/**/*",
      "package.json"
    ],
    "asarUnpack": [
      "node_modules/ffmpeg-static/**"
    ],
    "extraFiles": [],
    "fileAssociations": [
      {
        "ext": "md",
@@ -147,18 +73,10 @@
        "description": "Markdown Document",
        "mimeType": "text/markdown",
        "role": "Editor"
      },
      {
        "ext": "pdf",
        "name": "PDF Document",
        "description": "PDF Document",
        "mimeType": "application/pdf",
        "role": "Editor"
      }
    ],
    "mac": {
-      "category": "public.app-category.productivity",
+      "category": "public.app-category.productivity"
      "identity": null
    },
    "win": {
      "target": [
@@ -183,15 +101,7 @@
      ],
      "artifactName": "${productName}-${version}-${arch}.${ext}",
      "requestedExecutionLevel": "asInvoker",
-      "legalTrademarks": "Copyright (C) 2024-2025 ConcreteInfo",
+      "signAndEditExecutable": false
      "verifyUpdateCodeSignature": false,
      "signAndEditExecutable": false,
      "extraFiles": [
        {
          "from": "bin/win32/pandoc.exe",
          "to": "bin/pandoc.exe"
        }
      ]
    },
    "nsis": {
      "oneClick": false,
@@ -200,7 +110,7 @@
      "displayLanguageSelector": true,
      "createDesktopShortcut": true,
      "createStartMenuShortcut": true,
-      "shortcutName": "MarkdownConverter",
+      "shortcutName": "PanConverter",
      "runAfterFinish": true,
      "menuCategory": "Productivity",
      "license": "LICENSE",
@@ -215,22 +125,14 @@
        "AppImage",
        "snap"
      ],
-      "category": "Utility",
+      "category": "Utility"
      "maintainer": "ConcreteInfo <amit.wh@gmail.com>",
      "extraFiles": [
        {
          "from": "bin/linux/pandoc",
          "to": "bin/pandoc"
        }
      ]
    },
    "deb": {
      "depends": [
-        "imagemagick",
+        "pandoc"
        "libreoffice-common"
      ],
-      "description": "Professional Markdown editor and universal file converter",
+      "description": "Markdown editor and converter using Pandoc",
-      "maintainer": "ConcreteInfo <amit.wh@gmail.com>"
+      "maintainer": "Amit Haridas <amit.wh@gmail.com>"
    }
  }
 }
@@ -1,6 +0,0 @@
 module.exports = {
  plugins: {
    tailwindcss: {},
    autoprefixer: {},
  },
 }
@@ -1,59 +0,0 @@
 # create-selfsigned-cert.ps1
 # Generates a self-signed code-signing certificate for local/development builds.
 #
 # Usage:
 #   powershell -ExecutionPolicy Bypass -File scripts/create-selfsigned-cert.ps1
 #   npm run create-cert
 #
 # Then build with:
 #   $env:CSC_LINK="code-signing-cert.pfx"; $env:CSC_KEY_PASSWORD="YourPassword"; npm run build:win-signed
 #
 # NOTE: Self-signed certificates will still show a SmartScreen warning for end users.
 # For production releases, obtain an OV or EV certificate from a trusted CA
 # (DigiCert, Sectigo, Certum, etc.). EV certificates bypass SmartScreen immediately.
 # Open-source projects can apply for free signing at https://signpath.io/
 param(
    [string]$CertPassword = "MarkdownConverter2025",
    [string]$OutputFile   = "code-signing-cert.pfx",
    [string]$Subject      = "CN=ConcreteInfo, O=ConcreteInfo, L=India, C=IN"
 )
 Write-Host "Creating self-signed code-signing certificate..." -ForegroundColor Cyan
 # Create the certificate in the current user's certificate store
 $cert = New-SelfSignedCertificate `
    -Type CodeSigningCert `
    -Subject $Subject `
    -CertStoreLocation "Cert:\CurrentUser\My" `
    -NotAfter (Get-Date).AddYears(3) `
    -HashAlgorithm SHA256 `
    -KeyLength 4096 `
    -KeyUsage DigitalSignature
 if (-not $cert) {
    Write-Error "Failed to create certificate."
    exit 1
 }
 Write-Host "Certificate created: $($cert.Thumbprint)" -ForegroundColor Green
 # Export to PFX
 $securePassword = ConvertTo-SecureString -String $CertPassword -Force -AsPlainText
 $exportPath = Join-Path (Get-Location) $OutputFile
 Export-PfxCertificate -Cert $cert -FilePath $exportPath -Password $securePassword | Out-Null
 if (Test-Path $exportPath) {
    Write-Host "Certificate exported to: $exportPath" -ForegroundColor Green
    Write-Host ""
    Write-Host "To build a signed release:" -ForegroundColor Yellow
    Write-Host '  $env:CSC_LINK="code-signing-cert.pfx"' -ForegroundColor White
    Write-Host "  `$env:CSC_KEY_PASSWORD=`"$CertPassword`"" -ForegroundColor White
    Write-Host "  npm run build:win-signed" -ForegroundColor White
    Write-Host ""
    Write-Host "IMPORTANT: Add code-signing-cert.pfx to .gitignore!" -ForegroundColor Red
 } else {
    Write-Error "Export failed."
    exit 1
 }
@@ -1,148 +0,0 @@
 #!/usr/bin/env node
 /**
 * Downloads pandoc binary for the current build platform.
 * Run automatically via `npm run download-tools` before building.
 * Skips download if binary already exists (idempotent).
 */
 const https = require('https');
 const http = require('http');
 const fs = require('fs');
 const path = require('path');
 const os = require('os');
 const { execSync } = require('child_process');
 const PANDOC_VERSION = '3.9.0.2';
 const PANDOC_CONFIG = {
  linux: {
    url: `https://github.com/jgm/pandoc/releases/download/${PANDOC_VERSION}/pandoc-${PANDOC_VERSION}-linux-amd64.tar.gz`,
    archiveExt: '.tar.gz',
    destFile: 'pandoc',
    extract(archivePath, destDir) {
      const tmpDir = path.join(os.tmpdir(), `pandoc-${Date.now()}`);
      fs.mkdirSync(tmpDir, { recursive: true });
      execSync(`tar -xzf "${archivePath}" -C "${tmpDir}" pandoc-${PANDOC_VERSION}/bin/pandoc`);
      const src = path.join(tmpDir, `pandoc-${PANDOC_VERSION}`, 'bin', 'pandoc');
      fs.copyFileSync(src, path.join(destDir, 'pandoc'));
      fs.chmodSync(path.join(destDir, 'pandoc'), 0o755);
      fs.rmSync(tmpDir, { recursive: true, force: true });
    },
  },
  win32: {
    url: `https://github.com/jgm/pandoc/releases/download/${PANDOC_VERSION}/pandoc-${PANDOC_VERSION}-windows-x86_64.zip`,
    archiveExt: '.zip',
    destFile: 'pandoc.exe',
    extract(archivePath, destDir) {
      const tmpDir = path.join(os.tmpdir(), `pandoc-${Date.now()}`);
      fs.mkdirSync(tmpDir, { recursive: true });
      execSync(
        `powershell -Command "Expand-Archive -Force '${archivePath}' '${tmpDir}'"`,
      );
      const src = path.join(tmpDir, `pandoc-${PANDOC_VERSION}`, 'pandoc.exe');
      fs.copyFileSync(src, path.join(destDir, 'pandoc.exe'));
      fs.rmSync(tmpDir, { recursive: true, force: true });
    },
  },
  darwin: {
    url: `https://github.com/jgm/pandoc/releases/download/${PANDOC_VERSION}/pandoc-${PANDOC_VERSION}-x86_64-macOS.zip`,
    archiveExt: '.zip',
    destFile: 'pandoc',
    extract(archivePath, destDir) {
      const tmpDir = path.join(os.tmpdir(), `pandoc-${Date.now()}`);
      fs.mkdirSync(tmpDir, { recursive: true });
      execSync(`unzip -o "${archivePath}" -d "${tmpDir}"`);
      const src = path.join(tmpDir, `pandoc-${PANDOC_VERSION}`, 'bin', 'pandoc');
      fs.copyFileSync(src, path.join(destDir, 'pandoc'));
      fs.chmodSync(path.join(destDir, 'pandoc'), 0o755);
      fs.rmSync(tmpDir, { recursive: true, force: true });
    },
  },
 };
 function download(url, destPath) {
  return new Promise((resolve, reject) => {
    const file = fs.createWriteStream(destPath);
    let received = 0;
    let total = 0;
    let lastPct = -1;
    function get(redirectUrl) {
      const client = redirectUrl.startsWith('https://') ? https : http;
      client
        .get(redirectUrl, (res) => {
          if (res.statusCode === 301 || res.statusCode === 302) {
            get(res.headers.location);
            return;
          }
          if (res.statusCode !== 200) {
            reject(new Error(`HTTP ${res.statusCode} for ${redirectUrl}`));
            return;
          }
          total = parseInt(res.headers['content-length'] || '0', 10);
          res.on('data', (chunk) => {
            received += chunk.length;
            if (total > 0) {
              const pct = Math.floor((received / total) * 100);
              if (pct !== lastPct && pct % 10 === 0) {
                process.stdout.write(`  ${pct}%\r`);
                lastPct = pct;
              }
            }
          });
          res.pipe(file);
          file.on('finish', () => {
            file.close();
            process.stdout.write('  100%\n');
            resolve();
          });
        })
        .on('error', (err) => {
          fs.unlink(destPath, () => {});
          reject(err);
        });
    }
    get(url);
  });
 }
 async function downloadPandoc() {
  const platform = process.platform;
  const config = PANDOC_CONFIG[platform];
  if (!config) {
    console.log(`[download-tools] No pandoc config for platform "${platform}" — skipping.`);
    return;
  }
  const destDir = path.join(__dirname, '..', 'bin', platform);
  const destFile = path.join(destDir, config.destFile);
  if (fs.existsSync(destFile)) {
    console.log(`[download-tools] pandoc already present at ${destFile} — skipping.`);
    return;
  }
  fs.mkdirSync(destDir, { recursive: true });
  const tmpArchive = path.join(os.tmpdir(), `pandoc-download${config.archiveExt}`);
  console.log(`[download-tools] Downloading pandoc ${PANDOC_VERSION} for ${platform}...`);
  await download(config.url, tmpArchive);
  console.log(`[download-tools] Extracting to ${destDir}...`);
  config.extract(tmpArchive, destDir);
  try {
    fs.unlinkSync(tmpArchive);
  } catch (_) {
    /* ignore */
  }
  console.log(`[download-tools] pandoc ready: ${destFile}`);
 }
 downloadPandoc().catch((err) => {
  console.error('[download-tools] FAILED:', err.message);
  process.exit(1);
 });
@@ -1,82 +1,43 @@
 /**
 * Icon Generator for MarkdownConverter
 * Generates all required icon sizes from NewIcon.jpg
 */
 const sharp = require('sharp');
 const fs = require('fs');
 const path = require('path');
-// Source image
+const sizes = {
-const sourceImage = path.join(__dirname, '..', 'assets', 'docico1.png');
+    'icon.png': 512,
-const assetsDir = path.join(__dirname, '..', 'assets');
+    'icon@2x.png': 1024,
    'icon.ico': 256,
    'icon.icns': 512
 };
-// Icon sizes needed for different platforms
+const svgPath = path.join(__dirname, '..', 'assets', 'icon.svg');
-const iconSizes = [16, 24, 32, 48, 64, 128, 256, 512, 1024];
+const svgBuffer = fs.readFileSync(svgPath);
 async function generateIcons() {
-  console.log('Generating icons from docico1.png...');
+    for (const [filename, size] of Object.entries(sizes)) {
        const outputPath = path.join(__dirname, '..', 'assets', filename);
-  // Check if source exists
+        if (filename.endsWith('.png')) {
-  if (!fs.existsSync(sourceImage)) {
+            await sharp(svgBuffer)
-    console.error('Source image not found:', sourceImage);
+                .resize(size, size)
-    process.exit(1);
+                .png()
                .toFile(outputPath);
            console.log(`Generated ${filename}`);
        } else if (filename.endsWith('.ico')) {
            // For ICO, we'll just use the PNG version
            await sharp(svgBuffer)
                .resize(size, size)
                .png()
                .toFile(outputPath.replace('.ico', '.png'));
            console.log(`Generated ${filename.replace('.ico', '.png')} (use png2ico to convert)`);
        } else if (filename.endsWith('.icns')) {
            // For ICNS, we'll just use the PNG version
            await sharp(svgBuffer)
                .resize(size, size)
                .png()
                .toFile(outputPath.replace('.icns', '.png'));
            console.log(`Generated ${filename.replace('.icns', '.png')} (use png2icns to convert)`);
        }
  try {
    // Generate main icon.png (512x512)
    await sharp(sourceImage)
      .resize(512, 512, { fit: 'contain', background: { r: 255, g: 255, b: 255, alpha: 0 } })
      .png()
      .toFile(path.join(assetsDir, 'icon.png'));
    console.log('Generated icon.png (512x512)');
    // Generate icon@2x.png (1024x1024)
    await sharp(sourceImage)
      .resize(1024, 1024, { fit: 'contain', background: { r: 255, g: 255, b: 255, alpha: 0 } })
      .png()
      .toFile(path.join(assetsDir, 'icon@2x.png'));
    console.log('Generated icon@2x.png (1024x1024)');
    // Create icons directory for multi-size icons
    const iconsDir = path.join(assetsDir, 'icons');
    if (!fs.existsSync(iconsDir)) {
      fs.mkdirSync(iconsDir, { recursive: true });
    }
    // Generate all sizes
    for (const size of iconSizes) {
      await sharp(sourceImage)
        .resize(size, size, { fit: 'contain', background: { r: 255, g: 255, b: 255, alpha: 0 } })
        .png()
        .toFile(path.join(iconsDir, `${size}x${size}.png`));
      console.log(`Generated icons/${size}x${size}.png`);
    }
    // Generate favicon
    await sharp(sourceImage)
      .resize(32, 32, { fit: 'contain', background: { r: 255, g: 255, b: 255, alpha: 0 } })
      .png()
      .toFile(path.join(assetsDir, 'favicon.png'));
    console.log('Generated favicon.png (32x32)');
    // Generate tray icon (smaller, for system tray)
    await sharp(sourceImage)
      .resize(24, 24, { fit: 'contain', background: { r: 255, g: 255, b: 255, alpha: 0 } })
      .png()
      .toFile(path.join(assetsDir, 'tray-icon.png'));
    console.log('Generated tray-icon.png (24x24)');
    console.log('\nIcon generation complete!');
    console.log('\nFor Windows .ico file, use an online converter or:');
    console.log('  magick convert assets/icons/*.png assets/icon.ico');
    console.log('\nFor macOS .icns file, use:');
    console.log('  iconutil -c icns assets/icon.iconset -o assets/icon.icns');
  } catch (error) {
    console.error('Error generating icons:', error);
    process.exit(1);
    }
 }
-generateIcons();
+generateIcons().catch(console.error);
@@ -1,111 +0,0 @@
 /**
 * Electron File System Adapter
 *
 * Implements file system operations for Electron using IPC.
 * This abstracts file operations to enable easier testing and migration.
 *
 * @version 4.4.1
 */
 /**
 * Electron File System Adapter
 * @type {import('../types').FileSystemAdapter}
 */
 const electronFsAdapter = {
    /**
     * Read file content
     * @param {string} path - File path
     * @returns {Promise<string>} File content
     */
    async readFile(path) {
        return await window.electronAPI.file.read(path);
    },
    /**
     * Write content to file
     * @param {string} path - File path
     * @param {string} content - File content
     * @returns {Promise<void>}
     */
    async writeFile(path, content) {
        return await window.electronAPI.file.write(path, content);
    },
    /**
     * Delete file
     * @param {string} path - File path
     * @returns {Promise<void>}
     */
    async deleteFile(path) {
        return await window.electronAPI.file.delete(path);
    },
    /**
     * Ensure directory exists
     * @param {string} path - Directory path
     * @returns {Promise<void>}
     */
    async ensureDir(path) {
        return await window.electronAPI.file.ensureDir(path);
    },
    /**
     * List directory contents
     * @param {string} path - Directory path
     * @returns {Promise<Array<import('../types').FileInfo>>}
     */
    async listDirectory(path) {
        const result = await window.electronAPI.invoke('list-directory', path);
        if (!result?.entries) {
            return [];
        }
        return result.entries.map((entry) => ({
            name: entry.name,
            isDir: entry.isDirectory,
            size: entry.size ?? 0,
            modified: entry.modified ?? 0,
            path: entry.path
        }));
    },
    /**
     * Check if path exists
     * @param {string} path - Path to check
     * @returns {Promise<boolean>}
     */
    async exists(path) {
        return await window.electronAPI.file.exists(path);
    },
    /**
     * Check if path is a directory
     * @param {string} path - Path to check
     * @returns {Promise<boolean>}
     */
    async isDirectory(path) {
        return await window.electronAPI.file.isDirectory(path);
    },
    /**
     * Copy file or directory
     * @param {string} source - Source path
     * @param {string} dest - Destination path
     * @returns {Promise<void>}
     */
    async copy(source, dest) {
        return await window.electronAPI.file.copy(source, dest);
    },
    /**
     * Move file or directory
     * @param {string} source - Source path
     * @param {string} dest - Destination path
     * @returns {Promise<void>}
     */
    async move(source, dest) {
        return await window.electronAPI.file.move(source, dest);
    }
 };
 module.exports = { electronFsAdapter };
@@ -1,133 +0,0 @@
 /**
 * Platform Adapter Type Definitions
 *
 * This module defines the interfaces for platform-specific operations.
 * Adapters abstract file system, conversion, and system operations
 * to enable easier testing and future platform migration.
 *
 * @version 4.4.1
 */
 /**
 * @typedef {Object} FileInfo
 * @property {string} name - File or directory name
 * @property {boolean} isDir - True if directory
 * @property {number} size - File size in bytes
 * @property {number} modified - Last modified timestamp (ms since epoch)
 */
 /**
 * @typedef {Object} WatchEvent
 * @property {string} type - Event type ('add', 'change', 'unlink', 'addDir', 'unlinkDir')
 * @property {string} path - Affected file/directory path
 */
 /**
 * @typedef {Object} ConversionOptions
 * @property {string} format - Output format (pdf, docx, html, etc.)
 * @property {string} [pdfEngine] - PDF engine for PDF export (xelatex, pdflatex, etc.)
 * @property {string} [template] - Word template path for DOCX
 * @property {string} [geometry] - Page geometry for PDF (e.g., 'margin=1in')
 * @property {string} [header] - Header content
 * @property {string} [footer] - Footer content
 * @property {boolean} [toc] - Include table of contents
 */
 /**
 * @typedef {Object} ConversionResult
 * @property {string} input - Input file path
 * @property {string} output - Output file path
 * @property {boolean} success - Whether conversion succeeded
 * @property {string} [error] - Error message if failed
 */
 /**
 * @typedef {Object} PlatformCapabilities
 * @property {boolean} hasPandoc - Pandoc is available
 * @property {boolean} hasFfmpeg - FFmpeg is available
 * @property {boolean} hasLibreOffice - LibreOffice is available
 * @property {boolean} hasDirectFs - Direct file system access
 * @property {boolean} hasSystemNotifications - System notifications available
 * @property {boolean} hasPdfJs - PDF.js available for PDF viewing
 */
 /**
 * @typedef {Object} DialogOptions
 * @property {string} [title] - Dialog title
 * @property {string} [defaultPath] - Default path
 * @property {string[]} [filters] - File filters [{ name: 'Markdown', extensions: ['md'] }]
 * @property {string} [buttonLabel] - Custom button label
 */
 /**
 * @typedef {Object} SystemInfo
 * @property {string} platform - Operating system (win32, darwin, linux)
 * @property {string} homeDir - User home directory
 * @property {string} documentsDir - Documents directory
 * @property {string} downloadsDir - Downloads directory
 * @property {string} tempDir - Temporary directory
 * @property {string} appVersion - Application version
 */
 /**
 * @typedef {Object} FileSystemAdapter
 * @property {(path: string) => Promise<string>} readFile - Read file content
 * @property {(path: string, content: string) => Promise<void>} writeFile - Write file content
 * @property {(path: string) => Promise<void>} deleteFile - Delete file
 * @property {(path: string) => Promise<void>} ensureDir - Ensure directory exists
 * @property {(path: string) => Promise<FileInfo[]>} listDirectory - List directory contents
 * @property {(path: string) => Promise<boolean>} exists - Check if path exists
 * @property {(path: string) => Promise<boolean>} isDirectory - Check if path is directory
 * @property {(source: string, dest: string) => Promise<void>} copy - Copy file or directory
 * @property {(source: string, dest: string) => Promise<void>} move - Move file or directory
 * @property {(path: string, callback: (event: WatchEvent) => void) => () => void>} [watchDirectory] - Watch directory for changes
 */
 /**
 * @typedef {Object} ConversionAdapter
 * @property {(input: string, output: string, options: ConversionOptions) => Promise<void>} convertFile - Convert single file
 * @property {(files: string[], outputDir: string, options: ConversionOptions) => Promise<ConversionResult[]>} batchConvert - Batch convert files
 * @property {() => Promise<boolean>} checkPandoc - Check if Pandoc is available
 * @property {() => Promise<boolean>} checkFfmpeg - Check if FFmpeg is available
 * @property {() => Promise<boolean>} checkLibreOffice - Check if LibreOffice is available
 */
 /**
 * @typedef {Object} DialogAdapter
 * @property {(options?: DialogOptions) => Promise<string|null>} showOpenDialog - Show open file dialog
 * @property {(options?: DialogOptions) => Promise<string[]>} showOpenDialogMulti - Show multi-select open dialog
 * @property {(options?: DialogOptions) => Promise<string|null>} showSaveDialog - Show save file dialog
 * @property {(message: string, type?: string) => Promise<void>} showMessage - Show message dialog
 * @property {(message: string, type?: string) => Promise<boolean>} showConfirm - Show confirmation dialog
 */
 /**
 * @typedef {Object} SystemAdapter
 * @property {() => Promise<SystemInfo>} getSystemInfo - Get system information
 * @property {(title: string, body: string) => Promise<void>} showNotification - Show system notification
 * @property {(url: string) => Promise<void>} openExternal - Open URL in default browser
 * @property {(path: string) => Promise<void>} openInExplorer - Open path in file explorer
 * @property {(path: string) => Promise<void>} openInDefaultApp - Open path in default application
 */
 /**
 * @typedef {Object} PdfAdapter
 * @property {(path: string) => Promise<Object>} loadDocument - Load PDF document
 * @property {(doc: Object, pageNum: number, canvas: HTMLCanvasElement, scale: number, rotation: number) => Promise<void>} renderPage - Render PDF page to canvas
 * @property {(operations: Object) => Promise<void>} processOperation - Process PDF operation (merge, split, etc.)
 */
 /**
 * @typedef {Object} PlatformAdapter
 * @property {string} name - Platform name ('electron', 'web', 'tauri', 'flutter')
 * @property {FileSystemAdapter} fs - File system operations
 * @property {ConversionAdapter} convert - Conversion operations
 * @property {DialogAdapter} dialog - Dialog operations
 * @property {SystemAdapter} system - System operations
 * @property {PdfAdapter} [pdf] - PDF operations (optional, not available on all platforms)
 * @property {PlatformCapabilities} capabilities - Platform capabilities
 */
 module.exports = {
    // Type definitions are JSDoc only, no runtime exports needed
 };
@@ -1,112 +0,0 @@
 /**
 * Writing Analytics Panel — modal overlay displaying analytics dashboard
 */
 const { analyze } = require('./writing-analytics');
 function showAnalyticsModal(tabManager) {
    const existing = document.getElementById('analytics-modal');
    if (existing) existing.remove();
    const content = tabManager.getEditorContent();
    const metrics = analyze(content);
    const overlay = document.createElement('div');
    overlay.id = 'analytics-modal';
    overlay.className = 'analytics-overlay';
    const maxCount = metrics.topWords.length > 0 ? metrics.topWords[0].count : 1;
    overlay.innerHTML = `
        <div class="analytics-modal">
            <div class="analytics-header">
                <h2>Writing Analytics</h2>
                <button class="analytics-close" title="Close">&times;</button>
            </div>
            <div class="analytics-body">
                <div class="analytics-section">
                    <h3>Readability</h3>
                    <div class="analytics-row">
                        <span class="analytics-label">Flesch Reading Ease</span>
                        <span class="analytics-value">${metrics.fleschEase}<small>${metrics.readabilityLabel}</small></span>
                    </div>
                    <div class="analytics-row">
                        <span class="analytics-label">Grade Level</span>
                        <span class="analytics-value">${metrics.fleschGrade}</span>
                    </div>
                    <div class="readability-meter">
                        <div class="readability-fill" style="width: ${Math.max(0, Math.min(100, metrics.fleschEase))}%"></div>
                    </div>
                </div>
                <div class="analytics-section">
                    <h3>Timing</h3>
                    <div class="analytics-row">
                        <span class="analytics-label">Reading Time</span>
                        <span class="analytics-value">~${metrics.readingTime} min</span>
                    </div>
                    <div class="analytics-row">
                        <span class="analytics-label">Speaking Time</span>
                        <span class="analytics-value">~${metrics.speakingTime} min</span>
                    </div>
                </div>
                <div class="analytics-section">
                    <h3>Structure</h3>
                    <div class="analytics-row">
                        <span class="analytics-label">Sentences</span>
                        <span class="analytics-value">${metrics.sentenceCount} &bull; Paragraphs: ${metrics.paragraphCount}</span>
                    </div>
                    <div class="analytics-row">
                        <span class="analytics-label">Avg Sentence</span>
                        <span class="analytics-value">${metrics.avgSentenceLength} words</span>
                    </div>
                    ${metrics.longestSentenceLength > 0 ? `
                    <div class="analytics-row analytics-longest">
                        <span class="analytics-label">Longest (${metrics.longestSentenceLength} words)</span>
                        <span class="analytics-value analytics-sentence-preview">${escapeHtml(metrics.longestSentence)}</span>
                    </div>` : ''}
                </div>
                <div class="analytics-section">
                    <h3>Vocabulary</h3>
                    <div class="analytics-row">
                        <span class="analytics-label">Unique</span>
                        <span class="analytics-value">${metrics.uniqueWordCount} / ${metrics.wordCount}<small>${metrics.lexicalDiversity}%</small></span>
                    </div>
                    ${metrics.topWords.length > 0 ? `
                    <div class="word-cloud">
                        ${metrics.topWords.map(w => {
                            const scale = 13 + Math.round((w.count / maxCount) * 3);
                            return `<span class="word-tag" style="font-size:${scale}px">${escapeHtml(w.word)}<small>${w.count}</small></span>`;
                        }).join('')}
                    </div>` : ''}
                </div>
            </div>
        </div>
    `;
    const closeBtn = overlay.querySelector('.analytics-close');
    closeBtn.addEventListener('click', () => overlay.remove());
    overlay.addEventListener('click', (e) => {
        if (e.target === overlay) overlay.remove();
    });
    const escHandler = (e) => {
        if (e.key === 'Escape') {
            overlay.remove();
            document.removeEventListener('keydown', escHandler);
        }
    };
    document.addEventListener('keydown', escHandler);
    document.body.appendChild(overlay);
 }
 function escapeHtml(str) {
    const div = document.createElement('div');
    div.textContent = str;
    return div.innerHTML;
 }
 module.exports = { showAnalyticsModal };
@@ -1,127 +0,0 @@
 /**
 * Writing Analytics — pure computation engine
 * No DOM dependencies. Exported analyze(text) returns a metrics object.
 */
 const STOP_WORDS = new Set([
    'the', 'a', 'an', 'is', 'are', 'was', 'were', 'be', 'been',
    'have', 'has', 'had', 'do', 'does', 'did', 'will', 'would',
    'could', 'should', 'to', 'of', 'in', 'for', 'on', 'with',
    'at', 'by', 'from', 'as', 'and', 'or', 'but', 'if', 'it',
    'its', 'this', 'that', 'these', 'those', 'i', 'me', 'my',
    'we', 'our', 'you', 'your', 'he', 'him', 'his', 'she', 'her',
    'they', 'them', 'their', 'not', 'no', 'so', 'than', 'too',
    'very', 'also', 'just', 'about', 'up', 'out', 'what', 'which', 'who'
 ]);
 function countSyllables(word) {
    word = word.toLowerCase().replace(/(?:[^laeiouy]es|ed|[^laeiouy]e)$/, '');
    word = word.replace(/^y/, '');
    return word.match(/[aeiouy]{1,2}/gi)?.length || 1;
 }
 function extractWords(text) {
    return text.match(/[a-zA-Z]+(?:['-][a-zA-Z]+)*/g) || [];
 }
 function getReadabilityLabel(score) {
    if (score >= 90) return 'Very Easy';
    if (score >= 70) return 'Easy';
    if (score >= 50) return 'Standard';
    if (score >= 30) return 'Difficult';
    return 'Very Difficult';
 }
 function analyze(text) {
    if (!text || !text.trim()) {
        return {
            wordCount: 0,
            sentenceCount: 0,
            paragraphCount: 0,
            fleschEase: 0,
            fleschGrade: 0,
            readabilityLabel: 'N/A',
            readingTime: 0,
            speakingTime: 0,
            uniqueWordCount: 0,
            lexicalDiversity: 0,
            avgSentenceLength: 0,
            longestSentence: '',
            longestSentenceLength: 0,
            topWords: []
        };
    }
    const words = extractWords(text);
    const wordCount = words.length;
    const sentences = text.split(/[.!?]+/).map(s => s.trim()).filter(Boolean);
    const sentenceCount = Math.max(sentences.length, 1);
    const paragraphs = text.split(/\n\s*\n/).map(p => p.trim()).filter(Boolean);
    const paragraphCount = Math.max(paragraphs.length, 1);
    let totalSyllables = 0;
    for (const w of words) {
        totalSyllables += countSyllables(w);
    }
    const fleschEase = Math.round((206.835 - 1.015 * (wordCount / sentenceCount) - 84.6 * (totalSyllables / wordCount)) * 10) / 10;
    const fleschGrade = Math.round((0.39 * (wordCount / sentenceCount) + 11.8 * (totalSyllables / wordCount) - 15.59) * 10) / 10;
    const readabilityLabel = getReadabilityLabel(fleschEase);
    const readingTime = Math.ceil(wordCount / 200);
    const speakingTime = Math.ceil(wordCount / 130);
    const uniqueWords = new Set(words.map(w => w.toLowerCase()));
    const uniqueWordCount = uniqueWords.size;
    const lexicalDiversity = wordCount > 0 ? Math.round((uniqueWordCount / wordCount) * 1000) / 10 : 0;
    const avgSentenceLength = Math.round((wordCount / sentenceCount) * 10) / 10;
    let longestSentence = '';
    let longestSentenceLength = 0;
    for (const s of sentences) {
        const sWords = extractWords(s);
        if (sWords.length > longestSentenceLength) {
            longestSentenceLength = sWords.length;
            longestSentence = s.trim();
        }
    }
    if (longestSentence.length > 80) {
        longestSentence = longestSentence.substring(0, 80) + '...';
    }
    const wordFreq = {};
    for (const w of words) {
        const lower = w.toLowerCase();
        if (!STOP_WORDS.has(lower) && lower.length > 1) {
            wordFreq[lower] = (wordFreq[lower] || 0) + 1;
        }
    }
    const topWords = Object.entries(wordFreq)
        .sort((a, b) => b[1] - a[1])
        .slice(0, 10)
        .map(([word, count]) => ({ word, count }));
    return {
        wordCount,
        sentenceCount,
        paragraphCount,
        fleschEase,
        fleschGrade,
        readabilityLabel,
        readingTime,
        speakingTime,
        uniqueWordCount,
        lexicalDiversity,
        avgSentenceLength,
        longestSentence,
        longestSentenceLength,
        topWords
    };
 }
 module.exports = { analyze };
@@ -1,601 +0,0 @@
 <!DOCTYPE html>
 <html lang="en">
 <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>ASCII Art Generator - MarkdownConverter</title>
    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap" rel="stylesheet">
    <style>
        :root {
            --ci-dark-gray: #464646;
            --ci-medium-gray: #9a9696;
            --ci-accent: #e5461f;
            --ci-light-gray: #e3e3e3;
            --ci-black: #0d0b09;
            --ci-white: #ffffff;
            --ci-bg: #f5f5f5;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Inter', system-ui, sans-serif;
            background: var(--ci-bg);
            color: var(--ci-dark-gray);
            min-height: 100vh;
        }
        .header {
            background: linear-gradient(135deg, var(--ci-dark-gray) 0%, var(--ci-black) 100%);
            padding: 16px 24px;
            border-bottom: 3px solid var(--ci-accent);
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .header h1 {
            color: var(--ci-white);
            font-size: 1.25rem;
            font-weight: 600;
        }
        .container {
            padding: 24px;
            max-width: 100%;
        }
        .section {
            background: var(--ci-white);
            border-radius: 12px;
            padding: 20px;
            margin-bottom: 20px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
        }
        .section-title {
            font-weight: 600;
            margin-bottom: 16px;
            color: var(--ci-dark-gray);
            font-size: 0.95rem;
        }
        .mode-tabs {
            display: flex;
            gap: 8px;
            margin-bottom: 20px;
        }
        .mode-tab {
            padding: 10px 20px;
            border: 2px solid var(--ci-light-gray);
            background: var(--ci-white);
            border-radius: 8px;
            font-size: 0.875rem;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s;
        }
        .mode-tab:hover {
            border-color: var(--ci-accent);
        }
        .mode-tab.active {
            background: var(--ci-accent);
            border-color: var(--ci-accent);
            color: var(--ci-white);
        }
        .form-group {
            margin-bottom: 16px;
        }
        .form-label {
            display: block;
            font-size: 0.875rem;
            font-weight: 500;
            margin-bottom: 8px;
            color: var(--ci-dark-gray);
        }
        .form-input, .form-select, .form-textarea {
            width: 100%;
            padding: 10px 14px;
            border: 2px solid var(--ci-light-gray);
            border-radius: 8px;
            font-size: 0.875rem;
            font-family: inherit;
            transition: border-color 0.2s;
        }
        .form-input:focus, .form-select:focus, .form-textarea:focus {
            outline: none;
            border-color: var(--ci-accent);
        }
        .form-textarea {
            min-height: 80px;
            resize: vertical;
        }
        .preview-container {
            background: var(--ci-black);
            border-radius: 8px;
            padding: 16px;
            min-height: 200px;
            max-height: 350px;
            overflow: auto;
        }
        .preview-content {
            font-family: 'JetBrains Mono', monospace;
            font-size: 12px;
            line-height: 1.3;
            color: #00ff00;
            white-space: pre;
        }
        .template-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 8px;
            margin-bottom: 16px;
        }
        .template-btn {
            padding: 8px 12px;
            border: 2px solid var(--ci-light-gray);
            background: var(--ci-white);
            border-radius: 6px;
            font-size: 0.75rem;
            cursor: pointer;
            transition: all 0.2s;
        }
        .template-btn:hover {
            border-color: var(--ci-accent);
            background: rgba(229, 70, 31, 0.05);
        }
        .template-btn.active {
            border-color: var(--ci-accent);
            background: rgba(229, 70, 31, 0.1);
        }
        .footer {
            display: flex;
            justify-content: flex-end;
            gap: 12px;
            padding: 16px 24px;
            background: var(--ci-white);
            border-top: 1px solid var(--ci-light-gray);
            position: sticky;
            bottom: 0;
        }
        .btn {
            padding: 10px 24px;
            border-radius: 8px;
            font-size: 0.875rem;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s;
            border: none;
        }
        .btn-primary {
            background: var(--ci-accent);
            color: var(--ci-white);
        }
        .btn-primary:hover {
            background: #c93a18;
            transform: translateY(-1px);
        }
        .btn-secondary {
            background: var(--ci-light-gray);
            color: var(--ci-dark-gray);
        }
        .btn-secondary:hover {
            background: #d0d0d0;
        }
        .mode-section {
            display: none;
        }
        .mode-section.active {
            display: block;
        }
        .template-category {
            margin-bottom: 16px;
        }
        .template-category-title {
            font-size: 0.8rem;
            color: var(--ci-medium-gray);
            margin-bottom: 8px;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }
    </style>
 </head>
 <body>
    <div class="header">
        <h1>ASCII Art Generator</h1>
    </div>
    <div class="container">
        <div class="section">
            <div class="mode-tabs">
                <button class="mode-tab active" data-mode="text">Text Banner</button>
                <button class="mode-tab" data-mode="box">Box/Frame</button>
                <button class="mode-tab" data-mode="templates">Templates</button>
            </div>
            <!-- Text Banner Mode -->
            <div id="text-mode" class="mode-section active">
                <div class="form-group">
                    <label class="form-label">Text to Convert</label>
                    <input type="text" id="text-input" class="form-input" placeholder="Enter your text..." maxlength="30">
                </div>
                <div class="form-group">
                    <label class="form-label">Style</label>
                    <select id="font-style" class="form-select">
                        <option value="standard">Standard</option>
                        <option value="banner">Banner</option>
                        <option value="block">Block</option>
                        <option value="bubble">Bubble</option>
                        <option value="digital">Digital</option>
                    </select>
                </div>
            </div>
            <!-- Box/Frame Mode -->
            <div id="box-mode" class="mode-section">
                <div class="form-group">
                    <label class="form-label">Text Content</label>
                    <textarea id="box-text" class="form-textarea" placeholder="Enter text for the box..."></textarea>
                </div>
                <div class="form-group">
                    <label class="form-label">Box Style</label>
                    <select id="box-style" class="form-select">
                        <option value="single">Single Line</option>
                        <option value="double">Double Line</option>
                        <option value="rounded">Rounded</option>
                        <option value="bold">Bold</option>
                        <option value="ascii">ASCII (+|-)</option>
                    </select>
                </div>
                <div class="form-group">
                    <label class="form-label">Padding</label>
                    <input type="number" id="box-padding" class="form-input" min="0" max="10" value="2" style="width: 100px;">
                </div>
            </div>
            <!-- Templates Mode -->
            <div id="templates-mode" class="mode-section">
                <div class="template-category">
                    <div class="template-category-title">Arrows & Flow</div>
                    <div class="template-grid">
                        <button class="template-btn" data-template="arrow-right">Arrow Right</button>
                        <button class="template-btn" data-template="arrow-down">Arrow Down</button>
                        <button class="template-btn" data-template="decision">Decision</button>
                        <button class="template-btn" data-template="process">Process Flow</button>
                    </div>
                </div>
                <div class="template-category">
                    <div class="template-category-title">Diagrams</div>
                    <div class="template-grid">
                        <button class="template-btn" data-template="flowchart">Flowchart</button>
                        <button class="template-btn" data-template="sequence">Sequence</button>
                        <button class="template-btn" data-template="network">Network</button>
                        <button class="template-btn" data-template="hierarchy">Hierarchy</button>
                    </div>
                </div>
                <div class="template-category">
                    <div class="template-category-title">Boxes & Containers</div>
                    <div class="template-grid">
                        <button class="template-btn" data-template="header">Header</button>
                        <button class="template-btn" data-template="note">Note Box</button>
                        <button class="template-btn" data-template="warning">Warning</button>
                        <button class="template-btn" data-template="info">Info Box</button>
                    </div>
                </div>
                <div class="template-category">
                    <div class="template-category-title">Decorative</div>
                    <div class="template-grid">
                        <button class="template-btn" data-template="divider">Divider</button>
                        <button class="template-btn" data-template="separator">Separator</button>
                        <button class="template-btn" data-template="banner">Banner</button>
                        <button class="template-btn" data-template="checklist">Checklist</button>
                    </div>
                </div>
            </div>
        </div>
        <div class="section">
            <div class="section-title">Preview</div>
            <div class="preview-container">
                <div id="preview" class="preview-content"></div>
            </div>
        </div>
    </div>
    <div class="footer">
        <button class="btn btn-secondary" id="btn-generate">Generate Preview</button>
        <button class="btn btn-primary" id="btn-insert">Insert to Editor</button>
    </div>
    <script>
        // ASCII Art Generator Logic
        const FONTS = {
            standard: {
                height: 5,
                chars: {
                    'A': ['  /\\  ', ' /  \\ ', '/----\\', '|    |', '|    |'],
                    'B': ['|----\\', '|    |', '|----/', '|    \\', '|----/'],
                    'C': ['/----\\', '|     ', '|     ', '|     ', '\\----/'],
                    'D': ['|----\\', '|    |', '|    |', '|    |', '|----/'],
                    'E': ['|----', '|    ', '|--- ', '|    ', '|----'],
                    'F': ['|----', '|    ', '|--- ', '|    ', '|    '],
                    'G': ['/----\\', '|     ', '| |--\\', '|    |', '\\----/'],
                    'H': ['|    |', '|    |', '|----/', '|    |', '|    |'],
                    'I': ['|---|', '  |  ', '  |  ', '  |  ', '|---|'],
                    'J': ['    |', '    |', '    |', '|   |', '\\---/'],
                    'K': ['|   /', '|  / ', '|--  ', '|  \\ ', '|   \\'],
                    'L': ['|    ', '|    ', '|    ', '|    ', '|----'],
                    'M': ['|\\  /|', '| \\/ |', '|    |', '|    |', '|    |'],
                    'N': ['|\\   |', '| \\  |', '|  \\ |', '|   \\|', '|    |'],
                    'O': ['/----\\', '|    |', '|    |', '|    |', '\\----/'],
                    'P': ['|----\\', '|    |', '|----/', '|     ', '|     '],
                    'Q': ['/----\\', '|    |', '|  \\ |', '|   \\|', '\\----\\'],
                    'R': ['|----\\', '|    |', '|----/', '|  \\  ', '|   \\ '],
                    'S': ['/----\\', '|     ', '\\----\\', '     |', '\\----/'],
                    'T': ['-----', '  |  ', '  |  ', '  |  ', '  |  '],
                    'U': ['|    |', '|    |', '|    |', '|    |', '\\----/'],
                    'V': ['|    |', '|    |', ' \\  / ', '  \\/  ', '      '],
                    'W': ['|    |', '|    |', '|    |', '| /\\ |', '|/  \\|'],
                    'X': ['\\    /', ' \\  / ', '  \\/  ', '  /\\  ', ' /  \\ '],
                    'Y': ['\\   /', ' \\ / ', '  |  ', '  |  ', '  |  '],
                    'Z': ['-----', '   / ', '  /  ', ' /   ', '-----'],
                    ' ': ['     ', '     ', '     ', '     ', '     '],
                    '0': ['/---\\', '|   |', '| / |', '|/  |', '\\---/'],
                    '1': ['  /| ', ' / | ', '   | ', '   | ', ' ----'],
                    '2': ['/---\\', '    |', ' ---/', '/    ', '-----'],
                    '3': ['----\\', '    |', ' ---/', '    |', '----/'],
                    '4': ['|   |', '|   |', '-----', '    |', '    |'],
                    '5': ['-----', '|    ', '----\\', '    |', '----/'],
                    '6': ['/----', '|    ', '|---\\', '|   |', '\\---/'],
                    '7': ['-----', '   / ', '  /  ', ' /   ', '/    '],
                    '8': ['/---\\', '|   |', ' --- ', '|   |', '\\---/'],
                    '9': ['/---\\', '|   |', '\\----', '    |', '----/']
                }
            },
            banner: {
                height: 7,
                chars: {
                    'A': [' ##### ', ' ##   ##', '##     ##', '#########', '##     ##', '##     ##', '##     ##'],
                    'B': ['######## ', '##     ##', '##     ##', '######## ', '##     ##', '##     ##', '######## '],
                    'C': [' ###### ', '##    ##', '##      ', '##      ', '##      ', '##    ##', ' ###### '],
                    'D': ['######## ', '##     ##', '##     ##', '##     ##', '##     ##', '##     ##', '######## '],
                    'E': ['########', '##      ', '##      ', '###### ', '##      ', '##      ', '########'],
                    'F': ['########', '##      ', '##      ', '###### ', '##      ', '##      ', '##      '],
                    'G': [' ###### ', '##    ##', '##      ', '##  ####', '##    ##', '##    ##', ' ###### '],
                    'H': ['##     ##', '##     ##', '##     ##', '#########', '##     ##', '##     ##', '##     ##'],
                    'I': ['####', ' ## ', ' ## ', ' ## ', ' ## ', ' ## ', '####'],
                    'J': ['      ##', '      ##', '      ##', '      ##', '##    ##', '##    ##', ' ###### '],
                    'K': ['##    ##', '##   ## ', '##  ##  ', '#####   ', '##  ##  ', '##   ## ', '##    ##'],
                    'L': ['##      ', '##      ', '##      ', '##      ', '##      ', '##      ', '########'],
                    'M': ['##     ##', '###   ###', '#### ####', '## ### ##', '##     ##', '##     ##', '##     ##'],
                    'N': ['##    ##', '###   ##', '####  ##', '## ## ##', '##  ####', '##   ###', '##    ##'],
                    'O': [' ####### ', '##     ##', '##     ##', '##     ##', '##     ##', '##     ##', ' ####### '],
                    'P': ['######## ', '##     ##', '##     ##', '######## ', '##       ', '##       ', '##       '],
                    'Q': [' ####### ', '##     ##', '##     ##', '##     ##', '##  ## ##', '##    ## ', ' ##### ##'],
                    'R': ['######## ', '##     ##', '##     ##', '######## ', '##   ##  ', '##    ## ', '##     ##'],
                    'S': [' ###### ', '##    ##', '##      ', ' ###### ', '      ##', '##    ##', ' ###### '],
                    'T': ['########', '   ##   ', '   ##   ', '   ##   ', '   ##   ', '   ##   ', '   ##   '],
                    'U': ['##     ##', '##     ##', '##     ##', '##     ##', '##     ##', '##     ##', ' ####### '],
                    'V': ['##     ##', '##     ##', '##     ##', '##     ##', ' ##   ## ', '  ## ##  ', '   ###   '],
                    'W': ['##      ##', '##  ##  ##', '##  ##  ##', '##  ##  ##', '##  ##  ##', '##  ##  ##', ' ###  ### '],
                    'X': ['##     ##', ' ##   ## ', '  ## ##  ', '   ###   ', '  ## ##  ', ' ##   ## ', '##     ##'],
                    'Y': ['##    ##', ' ##  ## ', '  ####  ', '   ##   ', '   ##   ', '   ##   ', '   ##   '],
                    'Z': ['########', '     ## ', '    ##  ', '   ##   ', '  ##    ', ' ##     ', '########'],
                    ' ': ['       ', '       ', '       ', '       ', '       ', '       ', '       '],
                    '0': [' ###### ', '##    ##', '##    ##', '##    ##', '##    ##', '##    ##', ' ###### '],
                    '1': ['   ##   ', ' ####   ', '   ##   ', '   ##   ', '   ##   ', '   ##   ', ' ###### '],
                    '2': [' ###### ', '##    ##', '     ## ', '   ##   ', '  ##    ', ' ##     ', '########'],
                    '3': [' ###### ', '##    ##', '     ## ', '  ####  ', '     ## ', '##    ##', ' ###### '],
                    '4': ['    ##  ', '   ###  ', '  # ##  ', ' #  ##  ', '########', '    ##  ', '    ##  '],
                    '5': ['########', '##      ', '####### ', '      ##', '      ##', '##    ##', ' ###### '],
                    '6': [' ###### ', '##      ', '####### ', '##    ##', '##    ##', '##    ##', ' ###### '],
                    '7': ['########', '##   ## ', '    ##  ', '   ##   ', '  ##    ', '  ##    ', '  ##    '],
                    '8': [' ###### ', '##    ##', '##    ##', ' ###### ', '##    ##', '##    ##', ' ###### '],
                    '9': [' ###### ', '##    ##', '##    ##', ' #######', '      ##', '##    ##', ' ###### ']
                }
            },
            block: {
                height: 6,
                chars: {
                    'A': ['█████╗ ', '██╔══██╗', '███████║', '██╔══██║', '██║  ██║', '╚═╝  ╚═╝'],
                    'B': ['██████╗ ', '██╔══██╗', '██████╔╝', '██╔══██╗', '██████╔╝', '╚═════╝ '],
                    'C': ['█████╗ ', '██╔══██╗', '██║     ', '██║     ', '╚█████╔╝', ' ╚════╝ '],
                    'D': ['██████╗ ', '██╔══██╗', '██║  ██║', '██║  ██║', '██████╔╝', '╚═════╝ '],
                    'E': ['███████╗', '██╔════╝', '█████╗  ', '██╔══╝  ', '███████╗', '╚══════╝'],
                    'F': ['███████╗', '██╔════╝', '█████╗  ', '██╔══╝  ', '██║     ', '╚═╝     '],
                    'G': ['█████╗ ', '██╔══██╗', '██║  ███', '██║   ██', '╚█████╔╝', ' ╚════╝ '],
                    'H': ['██╗  ██╗', '██║  ██║', '███████║', '██╔══██║', '██║  ██║', '╚═╝  ╚═╝'],
                    'I': ['██╗', '██║', '██║', '██║', '██║', '╚═╝'],
                    'J': ['    ██╗', '    ██║', '    ██║', '██  ██║', '╚████╔╝', ' ╚═══╝ '],
                    'K': ['██╗  ██╗', '██║ ██╔╝', '█████╔╝ ', '██╔═██╗ ', '██║  ██╗', '╚═╝  ╚═╝'],
                    'L': ['██╗     ', '██║     ', '██║     ', '██║     ', '███████╗', '╚══════╝'],
                    'M': ['███╗   ███╗', '████╗ ████║', '██╔████╔██║', '██║╚██╔╝██║', '██║ ╚═╝ ██║', '╚═╝     ╚═╝'],
                    'N': ['███╗   ██╗', '████╗  ██║', '██╔██╗ ██║', '██║╚██╗██║', '██║ ╚████║', '╚═╝  ╚═══╝'],
                    'O': ['█████╗ ', '██╔══██╗', '██║  ██║', '██║  ██║', '╚█████╔╝', ' ╚════╝ '],
                    'P': ['██████╗ ', '██╔══██╗', '██████╔╝', '██╔═══╝ ', '██║     ', '╚═╝     '],
                    'Q': ['█████╗ ', '██╔══██╗', '██║  ██║', '██║  ██║', '╚██████╗', ' ╚═══██╝'],
                    'R': ['██████╗ ', '██╔══██╗', '██████╔╝', '██╔══██╗', '██║  ██║', '╚═╝  ╚═╝'],
                    'S': ['█████╗ ', '██╔══╝ ', '█████╗ ', '╚══██║ ', '█████║ ', '╚════╝ '],
                    'T': ['████████╗', '╚══██╔══╝', '   ██║   ', '   ██║   ', '   ██║   ', '   ╚═╝   '],
                    'U': ['██╗  ██╗', '██║  ██║', '██║  ██║', '██║  ██║', '╚█████╔╝', ' ╚════╝ '],
                    'V': ['██╗   ██╗', '██║   ██║', '██║   ██║', '╚██╗ ██╔╝', ' ╚████╔╝ ', '  ╚═══╝  '],
                    'W': ['██╗    ██╗', '██║    ██║', '██║ █╗ ██║', '██║███╗██║', '╚███╔███╔╝', ' ╚══╝╚══╝ '],
                    'X': ['██╗  ██╗', '╚██╗██╔╝', ' ╚███╔╝ ', ' ██╔██╗ ', '██╔╝ ██╗', '╚═╝  ╚═╝'],
                    'Y': ['██╗   ██╗', '╚██╗ ██╔╝', ' ╚████╔╝ ', '  ╚██╔╝  ', '   ██║   ', '   ╚═╝   '],
                    'Z': ['███████╗', '╚════██║', '  ███╔═╝', ' ██╔══╝ ', '███████╗', '╚══════╝'],
                    ' ': ['   ', '   ', '   ', '   ', '   ', '   ']
                }
            }
        };
        const TEMPLATES = {
            'arrow-right': '    ┌─────────────────────┐\n──▶│  Process or Action  │──▶\n    └─────────────────────┘',
            'arrow-down': '        │\n        ▼\n┌───────────────┐\n│   Process     │\n└───────────────┘\n        │\n        ▼',
            'decision': '       ╱╲\n      ╱  ╲\n     ╱ ?  ╲\n    ╱      ╲\n   ╱────────╲\n  ╱          ╲\n YES        NO\n  │          │\n  ▼          ▼',
            'process': '┌─────┐   ┌─────┐   ┌─────┐\n│  1  │──▶│  2  │──▶│  3  │\n└─────┘   └─────┘   └─────┘',
            'flowchart': '┌─────────────┐\n│   START    │\n└──────┬──────┘\n       │\n       ▼\n┌─────────────┐\n│  Process A  │\n└──────┬──────┘\n       │\n       ▼\n   ╱────────╲\n  ╱ Decision ╲\n  ╲    ?    ╱\n   ╲────────╱\n    │      │\n   YES    NO\n    │      │\n    ▼      ▼\n┌──────┐ ┌──────┐\n│  B   │ │  C   │\n└──────┘ └──────┘',
            'sequence': ' User      System     Database\n   │           │           │\n   │  Request  │           │\n   ├──────────►│           │\n   │           │  Query    │\n   │           ├──────────►│\n   │           │           │\n   │           │  Result   │\n   │           │◄──────────┤\n   │  Response │           │\n   │◄──────────┤           │\n   │           │           │',
            'network': '          ┌─────────┐\n          │ Server  │\n          └────┬────┘\n               │\n     ┌─────────┼─────────┐\n     │         │         │\n┌────┴────┐ ┌──┴──┐ ┌────┴────┐\n│ Client1 │ │ DB  │ │ Client2 │\n└─────────┘ └─────┘ └─────────┘',
            'hierarchy': '            ┌─────────┐\n            │   CEO   │\n            └────┬────┘\n       ┌─────────┼─────────┐\n       │         │         │\n   ┌───┴───┐ ┌───┴───┐ ┌───┴───┐\n   │  VP1  │ │  VP2  │ │  VP3  │\n   └───┬───┘ └───┬───┘ └───┬───┘\n       │         │         │\n   ┌───┴───┐ ┌───┴───┐ ┌───┴───┐\n   │ Team1 │ │ Team2 │ │ Team3 │\n   └───────┘ └───────┘ └───────┘',
            'header': '╔════════════════════════════════════╗\n║            SECTION TITLE           ║\n╚════════════════════════════════════╝',
            'note': '┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓\n┃  NOTE:                         ┃\n┃  This is an important note     ┃\n┃  that requires attention!      ┃\n┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛',
            'warning': '╔════════════════════════════════════╗\n║  ⚠️  WARNING                       ║\n║                                    ║\n║  Critical information here!        ║\n╚════════════════════════════════════╝',
            'info': '╭────────────────────────────────────╮\n│  ℹ️  INFO                          │\n│                                    │\n│  Helpful information here.         │\n╰────────────────────────────────────╯',
            'divider': '════════════════════════════════════════',
            'separator': '╭──────────────────────────────────────╮\n│                                      │\n╰──────────────────────────────────────╯',
            'banner': '★══════════════════════════════════════★\n║          YOUR TITLE HERE            ║\n★══════════════════════════════════════★',
            'checklist': '☐ Task 1 - Not completed\n☑ Task 2 - Completed  \n☐ Task 3 - Not completed\n☐ Task 4 - Not completed'
        };
        const BOX_STYLES = {
            single: { tl: '┌', tr: '┐', bl: '└', br: '┘', h: '─', v: '│' },
            double: { tl: '╔', tr: '╗', bl: '╚', br: '╝', h: '═', v: '║' },
            rounded: { tl: '╭', tr: '╮', bl: '╰', br: '╯', h: '─', v: '│' },
            bold: { tl: '┏', tr: '┓', bl: '┗', br: '┛', h: '━', v: '┃' },
            ascii: { tl: '+', tr: '+', bl: '+', br: '+', h: '-', v: '|' }
        };
        let currentMode = 'text';
        let currentTemplate = null;
        // Mode switching
        document.querySelectorAll('.mode-tab').forEach(tab => {
            tab.addEventListener('click', () => {
                document.querySelectorAll('.mode-tab').forEach(t => t.classList.remove('active'));
                tab.classList.add('active');
                currentMode = tab.dataset.mode;
                document.querySelectorAll('.mode-section').forEach(s => s.classList.remove('active'));
                document.getElementById(currentMode + '-mode').classList.add('active');
                generatePreview();
            });
        });
        // Template selection
        document.querySelectorAll('.template-btn').forEach(btn => {
            btn.addEventListener('click', () => {
                document.querySelectorAll('.template-btn').forEach(b => b.classList.remove('active'));
                btn.classList.add('active');
                currentTemplate = btn.dataset.template;
                generatePreview();
            });
        });
        // Generate text banner
        function generateTextBanner(text, style) {
            const font = FONTS[style] || FONTS.standard;
            const lines = Array(font.height).fill('');
            for (const char of text.toUpperCase()) {
                const charArt = font.chars[char] || font.chars[' '];
                if (charArt) {
                    for (let i = 0; i < font.height; i++) {
                        lines[i] += charArt[i] + ' ';
                    }
                }
            }
            return lines.join('\n');
        }
        // Generate box
        function generateBox(text, style, padding) {
            const box = BOX_STYLES[style] || BOX_STYLES.single;
            const lines = text.split('\n');
            const maxLen = Math.max(...lines.map(l => l.length)) + padding * 2;
            let result = box.tl + box.h.repeat(maxLen + 2) + box.tr + '\n';
            // Add padding lines at top
            for (let i = 0; i < Math.floor(padding / 2); i++) {
                result += box.v + ' '.repeat(maxLen + 2) + box.v + '\n';
            }
            // Add text lines
            for (const line of lines) {
                const paddedLine = ' '.repeat(padding) + line.padEnd(maxLen - padding) + ' ';
                result += box.v + ' ' + paddedLine + box.v + '\n';
            }
            // Add padding lines at bottom
            for (let i = 0; i < Math.floor(padding / 2); i++) {
                result += box.v + ' '.repeat(maxLen + 2) + box.v + '\n';
            }
            result += box.bl + box.h.repeat(maxLen + 2) + box.br;
            return result;
        }
        // Generate preview
        function generatePreview() {
            let result = '';
            if (currentMode === 'text') {
                const text = document.getElementById('text-input').value || 'HELLO';
                const style = document.getElementById('font-style').value;
                result = generateTextBanner(text, style);
            } else if (currentMode === 'box') {
                const text = document.getElementById('box-text').value || 'Your text here';
                const style = document.getElementById('box-style').value;
                const padding = parseInt(document.getElementById('box-padding').value) || 2;
                result = generateBox(text, style, padding);
            } else if (currentMode === 'templates') {
                result = currentTemplate ? TEMPLATES[currentTemplate] : 'Select a template...';
            }
            document.getElementById('preview').textContent = result;
        }
        // Event listeners for live preview
        document.getElementById('text-input').addEventListener('input', generatePreview);
        document.getElementById('font-style').addEventListener('change', generatePreview);
        document.getElementById('box-text').addEventListener('input', generatePreview);
        document.getElementById('box-style').addEventListener('change', generatePreview);
        document.getElementById('box-padding').addEventListener('input', generatePreview);
        document.getElementById('btn-generate').addEventListener('click', generatePreview);
        document.getElementById('btn-insert').addEventListener('click', () => {
            const content = document.getElementById('preview').textContent;
            if (content && window.electronAPI) {
                // Wrap in code block for markdown
                const wrapped = '```\n' + content + '\n```';
                window.electronAPI.send('insert-generated-content', wrapped);
                window.close();
            }
        });
        // Initial preview
        generatePreview();
    </script>
 </body>
 </html>
@@ -1,109 +0,0 @@
 class CommandPalette {
    constructor() {
        this.overlay = document.getElementById('command-palette-overlay');
        this.input = document.getElementById('command-palette-input');
        this.results = document.getElementById('command-palette-results');
        this.commands = [];
        this.selectedIndex = 0;
        this.filteredCommands = [];
        this.setupEventListeners();
    }
    register(label, shortcut, action) {
        this.commands.push({ label, shortcut, action });
    }
    open() {
        this.overlay.classList.remove('hidden');
        this.input.value = '';
        this.input.focus();
        this.selectedIndex = 0;
        this.renderResults('');
    }
    close() {
        this.overlay.classList.add('hidden');
    }
    isOpen() {
        return !this.overlay.classList.contains('hidden');
    }
    setupEventListeners() {
        this.input.addEventListener('input', () => {
            this.selectedIndex = 0;
            this.renderResults(this.input.value);
        });
        this.overlay.addEventListener('click', (e) => {
            if (e.target === this.overlay) this.close();
        });
        this.input.addEventListener('keydown', (e) => {
            if (e.key === 'Escape') {
                e.preventDefault();
                this.close();
            } else if (e.key === 'Enter') {
                e.preventDefault();
                this.executeSelected();
            } else if (e.key === 'ArrowDown') {
                e.preventDefault();
                this.selectedIndex = Math.min(this.selectedIndex + 1, this.filteredCommands.length - 1);
                this.updateSelection();
            } else if (e.key === 'ArrowUp') {
                e.preventDefault();
                this.selectedIndex = Math.max(this.selectedIndex - 1, 0);
                this.updateSelection();
            }
        });
    }
    renderResults(query) {
        this.filteredCommands = query
            ? this.commands.filter(cmd => cmd.label.toLowerCase().includes(query.toLowerCase()))
            : [...this.commands];
        this.results.innerHTML = this.filteredCommands.map((cmd, i) => `
            <div class="command-item ${i === this.selectedIndex ? 'selected' : ''}" data-index="${i}">
                <span class="command-label">${this.highlightMatch(cmd.label, query)}</span>
                ${cmd.shortcut ? `<span class="command-shortcut">${cmd.shortcut}</span>` : ''}
            </div>
        `).join('');
        this.results.querySelectorAll('.command-item').forEach((el) => {
            el.addEventListener('click', () => {
                const idx = parseInt(el.dataset.index);
                this.filteredCommands[idx].action();
                this.close();
            });
            el.addEventListener('mouseenter', () => {
                this.selectedIndex = parseInt(el.dataset.index);
                this.updateSelection();
            });
        });
    }
    highlightMatch(text, query) {
        if (!query) return text;
        const regex = new RegExp(`(${query.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')})`, 'gi');
        return text.replace(regex, '<strong>$1</strong>');
    }
    updateSelection() {
        this.results.querySelectorAll('.command-item').forEach((el, i) => {
            el.classList.toggle('selected', i === this.selectedIndex);
        });
        // Scroll selected into view
        const selected = this.results.querySelector('.command-item.selected');
        if (selected) selected.scrollIntoView({ block: 'nearest' });
    }
    executeSelected() {
        if (this.filteredCommands[this.selectedIndex]) {
            this.filteredCommands[this.selectedIndex].action();
            this.close();
        }
    }
 }
 module.exports = { CommandPalette };
@@ -1,142 +0,0 @@
 // CodeMirror 6 wrapper module
 // Provides createEditor() and getLanguageExtension() for the rest of the app.
 const {
  EditorView,
  keymap,
  lineNumbers,
  highlightActiveLine,
  drawSelection,
 } = require('@codemirror/view');
 const { EditorState } = require('@codemirror/state');
 const { markdown, markdownLanguage } = require('@codemirror/lang-markdown');
 // Language extensions loaded lazily on first use
 let _javascript, _html, _css, _json, _python;
 const {
  defaultKeymap,
  history,
  historyKeymap,
  indentWithTab,
 } = require('@codemirror/commands');
 const {
  searchKeymap,
  highlightSelectionMatches,
 } = require('@codemirror/search');
 const {
  autocompletion,
  completionKeymap,
 } = require('@codemirror/autocomplete');
 const {
  bracketMatching,
  foldGutter,
  indentOnInput,
 } = require('@codemirror/language');
 const { oneDark } = require('@codemirror/theme-one-dark');
 // Custom theme for JetBrains Mono font
 const jetBrainsMonoTheme = EditorView.theme({
  '&': {
    fontFamily: "'JetBrains Mono', 'Fira Code', 'SF Mono', Monaco, 'Courier New', monospace"
  },
  '.cm-content': {
    fontFamily: 'inherit'
  },
  '.cm-scroller': {
    fontFamily: 'inherit'
  }
 });
 /**
 * Create a CodeMirror 6 editor instance.
 *
 * @param {HTMLElement} parentElement - DOM element to mount the editor in
 * @param {Object}  options
 * @param {string}  options.content          - initial document content (default '')
 * @param {Function} options.onChange        - called with new content string on every doc change
 * @param {Function} options.onUpdate       - called with the EditorView on every update (selection, doc change, etc.)
 * @param {boolean} options.isDark           - apply oneDark theme when true (default false)
 * @param {boolean} options.showLineNumbers  - show line-number gutter (default true)
 * @returns {EditorView} the created editor view
 */
 function createEditor(parentElement, options = {}) {
  console.log('[createEditor] Called with parentElement:', parentElement?.id, 'dimensions:', parentElement?.clientWidth, 'x', parentElement?.clientHeight);
  if (!parentElement) {
    console.error('[createEditor] ERROR: parentElement is null or undefined!');
    return null;
  }
  const {
    content = '',
    onChange = () => {},
    onUpdate = null,
    isDark = false,
    showLineNumbers = true,
  } = options;
  const extensions = [
    markdown({ base: markdownLanguage }),
    history(),
    drawSelection(),
    highlightActiveLine(),
    bracketMatching(),
    indentOnInput(),
    highlightSelectionMatches(),
    autocompletion(),
    foldGutter(),
    jetBrainsMonoTheme,
    keymap.of([
      ...defaultKeymap,
      ...historyKeymap,
      ...searchKeymap,
      ...completionKeymap,
      indentWithTab,
    ]),
    EditorView.updateListener.of((update) => {
      if (update.docChanged) {
        onChange(update.state.doc.toString());
      }
      if (onUpdate && (update.docChanged || update.selectionSet)) {
        onUpdate(update.view);
      }
    }),
    EditorView.lineWrapping,
  ];
  if (showLineNumbers) {
    extensions.push(lineNumbers());
  }
  if (isDark) {
    extensions.push(oneDark);
  }
  const state = EditorState.create({ doc: content, extensions });
  const view = new EditorView({ state, parent: parentElement });
  return view;
 }
 /**
 * Return the appropriate CodeMirror language extension for a given language name.
 *
 * Supported values: javascript, js, html, css, json, python, py, markdown.
 * Falls back to markdown when the language is unrecognised.
 *
 * @param {string} lang - language identifier
 * @returns {Extension} CodeMirror language extension
 */
 function getLanguageExtension(lang) {
  const loaders = {
    javascript: () => { if (!_javascript) _javascript = require('@codemirror/lang-javascript').javascript; return _javascript(); },
    html: () => { if (!_html) _html = require('@codemirror/lang-html').html; return _html(); },
    css: () => { if (!_css) _css = require('@codemirror/lang-css').css; return _css(); },
    json: () => { if (!_json) _json = require('@codemirror/lang-json').json; return _json(); },
    python: () => { if (!_python) _python = require('@codemirror/lang-python').python; return _python(); },
    markdown: () => markdown({ base: markdownLanguage }),
  };
  loaders.js = loaders.javascript;
  loaders.py = loaders.python;
  const loader = loaders[lang];
  return loader ? loader() : markdown({ base: markdownLanguage });
 }
 module.exports = { createEditor, getLanguageExtension };
@@ -1,75 +0,0 @@
 /* Local Font Definitions for MarkdownConverter */
 /* Inter Font Family */
@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 300;
    font-display: swap;
    src: url('../assets/fonts/Inter-Light.woff2') format('woff2');
 }
@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url('../assets/fonts/Inter-Regular.woff2') format('woff2');
 }
@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 500;
    font-display: swap;
    src: url('../assets/fonts/Inter-Medium.woff2') format('woff2');
 }
@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 600;
    font-display: swap;
    src: url('../assets/fonts/Inter-SemiBold.woff2') format('woff2');
 }
@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 700;
    font-display: swap;
    src: url('../assets/fonts/Inter-Bold.woff2') format('woff2');
 }
 /* JetBrains Mono Font Family - For code, markdown editor, and ASCII art */
@font-face {
    font-family: 'JetBrains Mono';
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url('../assets/fonts/JetBrainsMono-Regular.woff2') format('woff2');
 }
@font-face {
    font-family: 'JetBrains Mono';
    font-style: normal;
    font-weight: 500;
    font-display: swap;
    src: url('../assets/fonts/JetBrainsMono-Medium.woff2') format('woff2');
 }
@font-face {
    font-family: 'JetBrains Mono';
    font-style: normal;
    font-weight: 600;
    font-display: swap;
    src: url('../assets/fonts/JetBrainsMono-SemiBold.woff2') format('woff2');
 }
@font-face {
    font-family: 'JetBrains Mono';
    font-style: normal;
    font-weight: 700;
    font-display: swap;
    src: url('../assets/fonts/JetBrainsMono-Bold.woff2') format('woff2');
 }
--- a/Show More
+++ b/Show More