feat(export): themable PDF/Word exports; Windows CI green (v4.7.1)

Export themes: - Six presets in the export dialog (basic + advanced modes) for PDF/DOCX: Default, Modern, Classic, Sepia, Minimal, Elegant - PDF: LaTeX header (xcolor/titlesec) recolors headings, adds section rules and colored links — core-TeX packages only, hex-literal only (no injection surface) - DOCX: styles.xml surgery recolors Heading1-6/Title/Subtitle/Hyperlink and swaps heading/body fonts; verified end-to-end against a real pandoc-produced docx - Themes ride along in export presets (unknown ids fall back to Default) Windows CI fixes: - pdfjs standardFontDataUrl now a file:// URL (backslash paths failed pdfjs's trailing-slash validation, breaking extractText/extractImages) - sharp temp cleanup EPERM retries; path-separator assertions; pdfjs test timeouts raised; batch suite testTimeout 30s 648/648 tests green; 4.7.1 linux+win artifacts rebuilt.
fix(pdf): hand pdfjs a file:// standardFontDataUrl; repair Windows CI tests
2026-10-01 17:29:29 +05:30 · 2026-09-05 23:59:53 +05:30 · 2026-09-05 23:33:58 +05:30 · 2026-09-05 23:20:43 +05:30 · 2026-09-05 23:10:15 +05:30 · 2026-09-05 22:48:45 +05:30
340 changed files with 82920 additions and 22512 deletions
@@ -0,0 +1,9 @@
 # Text artifacts that are hash-pinned must check out byte-identical everywhere
 assets/fonts/FiraCode-LICENSE.txt -text
 # Binaries: never normalize
 *.ttf -text
 *.woff -text
 *.woff2 -text
 *.png -text
 *.ico -text
 *.icns -text
@@ -0,0 +1,28 @@
 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
@@ -0,0 +1,178 @@
 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: Bundle MarkItDown (optional, best effort)
        # Freezes markitdown + Python into bin/linux/markitdown; failure is
        # non-fatal — the build then ships without it and the app falls back
        # to a system markitdown at runtime.
        run: npm run bundle:markitdown
        continue-on-error: true
      - 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: Bundle MarkItDown (optional, best effort)
        # Windows runners ship python + venv; non-fatal on failure — the
        # package then omits the bundled binary by design
        run: npm run bundle:markitdown
        continue-on-error: true
      - 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
  build-macos:
    runs-on: macos-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: Bundle MarkItDown (optional, best effort)
        run: npm run bundle:markitdown
        continue-on-error: true
      - name: Run tests
        run: npm test
      - name: Build macOS packages
        run: npm run build:mac -- --publish=never
      - name: Upload macOS artifacts
        uses: actions/upload-artifact@v4
        with:
          name: macos-artifacts
          path: |
            dist/*.dmg
            dist/*.zip
          retention-days: 5
  release:
    needs: [build-linux, build-windows, build-macos]
    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: Download macOS artifacts
        uses: actions/download-artifact@v4
        continue-on-error: true
        with:
          name: macos-artifacts
          path: dist
      - name: Create GitHub Release
        uses: softprops/action-gh-release@v2
        with:
          generate_release_notes: true
          files: dist/*
@@ -8,14 +8,22 @@ Thumbs.db
 *.swp
 *.swo
 *~
-.vscode/
+.vscode/*
 !.vscode/launch.json
 .idea/
 *.iml
 out/
 .cache/
 .npm/
 .electron/
-package-lock.json
+# package-lock.json is intentionally tracked for reproducible CI builds
 # 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
@@ -34,3 +42,7 @@ pdf\ modal.png
 .claude/
 CLAUDE.md
 agents.md
 coverage/
 # Superpowers brainstorm artifacts
 .superpowers/
@@ -0,0 +1,469 @@
 # 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.
@@ -0,0 +1,215 @@
 # 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.
@@ -0,0 +1,27 @@
 {
  "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
  }
 }
@@ -0,0 +1,522 @@
 # 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.
@@ -0,0 +1,17 @@
 {
  "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 +1,48 @@
 {
  "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"
      }
    }
  ]
 }
@@ -0,0 +1,25 @@
 # 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.
@@ -0,0 +1,103 @@
 # CLAUDE.md — MarkdownConverter (master)
 > General code-quality, JavaScript, git, security, and testing standards are in the **global CLAUDE.md**. This file holds project- and branch-specific notes.
 ## Project Overview
 Electron desktop app for Markdown editing and universal file conversion powered by Pandoc. Cross-platform (Win/macOS/Linux). Features: multi-tab editor with live preview, 25+ themes, PDF viewer/editor (merge/split/compress/rotate/watermark/password), export to 20+ formats (PDF/DOCX/ODT/EPUB/HTML/LaTeX/RTF/PPTX), batch conversion, syntax highlighting, diagram support (Mermaid), Git integration, and a plugin system.
 - **Version:** 4.4.5
 - **License:** MIT
 - **App ID:** `com.concreteinfo.markdownconverter`
 ## Branch Specifics
 This is the **primary/release branch** — a vanilla JavaScript Electron app with no bundler or framework in the renderer. The renderer is a single large `renderer.js` (5,300+ lines) loaded directly via `src/index.html`. All UI is hand-rolled DOM manipulation.
 ## Architecture
 ### Main Process (`src/main.js` — 4,260 lines)
 Monolithic main process file. Contains all IPC handlers, Pandoc invocation, file operations, menu definitions (600+ lines), and window lifecycle. Key modules extracted:
 - `src/main/PDFOperations.js` — PDF manipulation via `pdf-lib` (merge, split, compress, rotate, delete, reorder, watermark, encrypt, decrypt, permissions)
 - `src/main/GitOperations.js` — Git status/stage/commit/log via `simple-git`
 ### Renderer (`src/renderer.js` — 5,361 lines)
 Vanilla JS, no framework. Directly manipulates DOM. Loads CodeMirror 6 via `src/editor/codemirror-setup.js`. Uses `marked` + `highlight.js` + `DOMPurify` + `mermaid` for rendering. Lazy-loads sidebar panels, REPL, command palette, zen mode.
 ### Preload (`src/preload.js` — 448 lines)
 Exists as IPC bridge, but **`contextIsolation: false` and `nodeIntegration: true`** — the renderer has full Node access. Preload is effectively a thin passthrough.
 ### Security Model
 - `contextIsolation: false` + `nodeIntegration: true` (legacy; the react-electron branch fixes this)
 - Pandoc invoked via `execFile` (not `exec`) to prevent shell injection
 - Path traversal protection: `validatePath()`, `resolveWritablePath()`, blocks sensitive system dirs
 - Permission handler only allows `clipboard-read`/`clipboard-write`
 - Rate limiter on conversions (2-second minimum interval)
 - File size limit: 50MB
 - Error message sanitization strips absolute paths
 ### Plugin System (`src/plugins/`)
 Manifest-based discovery (`manifest.json`). Built-in `writing-studio` plugin with sprint/goal/snapshot management. Plugin API exposed via `src/plugins/plugin-api.js`.
 ### Settings
 Custom JSON file store at `<userData>/settings.json` (NOT `electron-store` despite the dependency). Recent files at `<userData>/recent-files.json`.
 ## System Dependencies
 | Dependency | Required | Notes |
 |---|---|---|
 | **Node.js** | >= 20 | Electron 41 bundles Node 20.x |
 | **Pandoc** | Yes (for exports) | Downloaded to `bin/<platform>/pandoc` via `scripts/download-tools.js` (v3.9.0.2). Falls back to system PATH. Must be present for DOCX/ODT/EPUB/LaTeX/PPTX export. |
 | **FFmpeg** | Bundled | `ffmpeg-static` npm package; `asarUnpacked` for packaged builds |
 | **MiKTeX / TeX Live** | Optional | For LaTeX PDF export; MiKTeX PATH injected on Windows automatically |
 | **ImageMagick** | Optional | Linux image conversion; listed as deb dependency |
 | **LibreOffice** | Optional | Enhanced document conversion; listed as deb dependency |
 ## Development Commands
 ```bash
 npm start                  # Launch Electron app (dev mode)
 npm test                   # Jest test suite
 npm test:watch             # Jest in watch mode
 npm test:coverage          # Jest with coverage report
 npm run lint               # ESLint check (src + tests)
 npm run lint:fix           # ESLint auto-fix
 npm run format             # Prettier write
 npm run format:check       # Prettier check only
 npm run download-tools     # Download Pandoc binaries to bin/
 npm run generate-icons     # Generate app icons via sharp
 ```
 ## Build & Package
 **Tool:** `electron-builder` (v26.0.12), config inline in `package.json` (no separate config file).
 | Target | Platforms |
 |---|---|
 | `npm run build` | electron-builder (default platform) |
 | `npm run build:win` | Windows: NSIS installer + portable + zip (x64) |
 | `npm run build:mac` | macOS: default dmg |
 | `npm run build:linux` | Linux: deb + AppImage + snap |
 | `npm run dist` | Build without publish |
 | `npm run dist:all` | Build for all platforms |
 **Bundled with builds:** Pandoc binary per platform. FFmpeg via `ffmpeg-static` (asarUnpacked). NSIS installer uses custom script at `scripts/nsis-installer.nsh`.
 **Output:** `dist/` directory.
 **CI:** GitHub Actions workflows in `.github/workflows/` (ci.yml, release.yml).
 ## Project Conventions / Gotchas
 - **No bundler/transpilation.** The app uses vanilla CommonJS JavaScript. `src/main.js` is loaded directly by Electron. No webpack, no Vite, no TypeScript, no Babel.
 - **Monolithic files.** `main.js` (4,260 lines) and `renderer.js` (5,361 lines) contain most logic. Not ideal but is the current state of this branch.
 - **CodeMirror 6** for the editor, configured in `src/editor/codemirror-setup.js`.
 - **PDF rendering** uses `pdfjs-dist`; **PDF manipulation** uses `pdf-lib` in the main process.
 - **Renderer security is weak** — full Node access in renderer. Do NOT introduce new privileged renderer code without understanding this.
 - **Pandoc is external.** Must be installed separately or downloaded via `npm run download-tools`. HTML and built-in PDF export work without Pandoc; other formats require it.
 - **PDF export fallback chain:** xelatex -> pdflatex -> lualatex -> Electron built-in `printToPDF()`.
 - **ESLint flat config** (`eslint.config.js`) with ECMAScript 2022. Prettier with 2-space indent, single quotes, semicolons, 100-char width.
 - **Tests:** Jest with jsdom environment, 15% coverage threshold. 24 test files in `tests/`.
 - **File associations:** `.md`, `.markdown`, `.pdf` registered at install.
 - **Single instance lock** enforced via `app.requestSingleInstanceLock()`.
 - **Adapters layer** (`src/adapters/`) abstracts file system operations for potential future non-Electron targets.
@@ -1,3 +1,7 @@
 <p align="center">
  <img src="assets/markdown-converter-assets/logo-horizontal.svg" alt="Markdown Converter" width="420">
 </p>
 # MarkdownConverter
 A powerful cross-platform Markdown editor and document converter powered by Pandoc, built with Electron. 100% open-source with no proprietary dependencies.
@@ -43,6 +47,7 @@ A powerful cross-platform Markdown editor and document converter powered by Pand
 - **EPUB** - E-book format
 - **LaTeX** - Academic document format
 - **RTF** - Rich Text Format
 - **Export themes** - Five visual styles (Modern, Classic, Sepia, Minimal, Elegant) for PDF and Word exports — recolored headings, links, and fonts
 ### Advanced Features
 - **Custom headers & footers** - Add headers/footers to exports with dynamic fields
@@ -51,12 +56,24 @@ A powerful cross-platform Markdown editor and document converter powered by Pand
 - **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.)
 - **MarkItDown import** - Any file → Markdown via [Microsoft MarkItDown](https://github.com/microsoft/markitdown): PDF, DOCX, PPTX, XLSX, Outlook .msg, EPUB, images, ZIP (audio/OCR with the `[all]` extras)
 - **Excel export** - Markdown tables to native .xlsx workbooks (one sheet per table)
 - **AI Assistant** - Multi-provider AI help (OpenAI/Anthropic/Ollama/LM Studio): chat panel, summarize/improve/translate commands, grammar proofreading
 - **Inline comments** - Anchor-based document comments in `.comments/` sidecars with F8 navigation
 - **Wiki-links & Backlinks** - `[[Note]]` links with click-to-create and a "what links here?" panel (local knowledge base)
 - **Crash recovery** - Session restore of open tabs and unsaved buffers after a crash
 - **Version history** - Automatic pre-save snapshots with restore/diff/delete from the History panel
 - **Vim mode & snippet expansion** - Vim keybindings toggle; Tab expands saved snippets
 - **Quick Note** - Global scratchpad (Ctrl+Alt+Q) that appends to `notes/quick-notes.md`
 - **Real PDF encryption** - Password protection, removal, and permissions actually work
 - **Offline math & diagrams** - KaTeX bundled locally; PlantUML renders locally when the CLI is installed
 ## Installation
 ### Prerequisites
 - [Node.js](https://nodejs.org/) (v16 or later)
 - [Pandoc](https://pandoc.org/installing.html) (required for export functionality)
 - Optional: [MarkItDown](https://github.com/microsoft/markitdown) (`pip install "markitdown[all]"`) for any-file → Markdown import
 ### Install Dependencies
 ```bash
@@ -96,9 +113,18 @@ npm run build:linux
 | Redo | Ctrl+Shift+Z |
 | New Tab | Ctrl+T |
 | Close Tab | Ctrl+W |
-| Toggle Preview | Ctrl+Shift+P |
+| Toggle Preview | Ctrl+Shift+V |
 | Zoom In | Ctrl+Shift++ |
 | Zoom Out | Ctrl+Shift+- |
 | Command Palette | Ctrl+Shift+P |
 | Zen Mode | F11 |
 | Writing Analytics | Ctrl+Shift+A |
 | Quick Note | Ctrl+Alt+Q |
 | Universal Converter | Ctrl+Shift+C |
 | Table Generator | Ctrl+Shift+T |
 | ASCII Art Generator | Ctrl+Shift+A |
 | Next Comment | F8 |
 | Add Comment at Cursor | Ctrl+Alt+M |
 ## Themes
@@ -140,6 +166,43 @@ Open PDF files directly in MarkdownConverter:
 - Rotate pages left or right
 - Close PDF to return to editor
 ## Bundled Dependencies, Legal Notices & Credits
 MarkdownConverter ships as a self-contained package. Everything needed for the
 core workflows is **bundled**; a few large optional tools are detected from
 the system when present.
 ### Bundled with the app
 | Component | License | Role |
 |---|---|---|
 | [Pandoc](https://pandoc.org) 3.9 | GPL-2.0+ (separate process) | 25+ export/import formats |
 | [FFmpeg](https://ffmpeg.org) (via ffmpeg-static) | GPL-3.0+ build (separate process) | audio/video tools |
 | [MarkItDown](https://github.com/microsoft/markitdown) (MIT) + embedded Python runtime (PSF) | MIT / PSF | any-file → Markdown import (PDF/DOCX/PPTX/XLSX/Outlook/EPUB/images/ZIP) |
 | [sharp](https://sharp.pixelplumbing.com) + libvips | Apache-2.0 / LGPL-2.1+ (dynamic) | image tools |
 | [KaTeX](https://katex.org), [marked](https://marked.js.org), [highlight.js], [DOMPurify], [mermaid], [CodeMirror 6], pdf-lib (@cantoo fork), pdfjs-dist, JSZip, simple-git | MIT / Apache-2.0 / BSD-3 / MPL-2.0 | editor, preview, PDF, Git |
 | JetBrains Mono & Fira Code fonts | SIL OFL 1.1 | editor typography |
 GPL-licensed tools run as **separate processes** (never linked into the app)
 and their complete corresponding sources are offered in
 [SOURCES.md](SOURCES.md). Full details: [THIRD-PARTY-NOTICES.md](THIRD-PARTY-NOTICES.md),
 also available inside the app under **Help → Third-Party Notices & Licenses**.
 ### Not bundled (used when installed)
 LibreOffice (Office conversion), MiKTeX/TeX Live (LaTeX PDF), ImageMagick
 (extra image formats), PlantUML + Java (local diagrams), Calibre (MOBI),
 MarkItDown `[all]` extras (audio transcription / OCR).
 ### Credits
 Built on open source: [Electron], [CodeMirror], [marked], [KaTeX],
 [highlight.js], [DOMPurify](https://github.com/cure53/DOMPurify),
 [mermaid](https://mermaid.js.org), [pdf-lib], [pdf.js](https://mozilla.github.io/pdf.js/),
 [sharp]/libvips, [Pandoc], [FFmpeg], [MarkItDown] by Microsoft,
 [simple-git], [JSZip], [JetBrains Mono], [Fira Code]. Thank you to all their
 authors and maintainers.
 ## Open Source
 MarkdownConverter is 100% open-source. All dependencies are permissively licensed:
@@ -162,4 +225,4 @@ Amit Haridas (amit.wh@gmail.com)
 ## Version
-v3.0.0
+v4.7.1
@@ -0,0 +1,55 @@
 # Source Code Availability (GPL / LGPL Written Offer)
 MarkdownConverter distributes the following binaries built from GPL-licensed
 software. Per GPL §3(b), this document is the written offer: **corresponding
 source code for the exact versions listed below is available on request for
 at least three years from each release**, and permanently at the referenced
 public locations. Write to: amit.wh@gmail.com (or open a GitHub issue at
 https://github.com/amitwh/markdown-converter/issues).
 ## Pandoc — GPL-2.0-or-later
 - Binary shipped: `bin/pandoc` (v3.9.0.2, official upstream release, unmodified)
 - SHA-256 (linux): `7d124235998ecd3cdd9a463b1e5f6691a178b6461824c29a36170a0882f05597`
 - Source: <https://github.com/jgm/pandoc/archive/refs/tags/3.9.0.2.tar.gz>
 - Pandoc statically links Haskell libraries (GHC ecosystem, mostly BSD-3);
  their sources are included in the upstream release tarball's dependency set.
 ## FFmpeg — GPL-3.0-or-later (build configuration)
 - Binary shipped: `ffmpeg` provided by the npm package `ffmpeg-static@5.3.0`
  (Linux: johnvansickle.com build; Windows: gyan.dev; macOS: evermeet.cx —
  all `--enable-gpl` builds including x264/x265, per the build banner)
 - Source:
  - FFmpeg: <https://ffmpeg.org/releases/> (use the release matching
    `ffmpeg -version` of the shipped binary)
  - Build scripts & pinned versions: <https://github.com/eugeneware/ffmpeg-static>
  - x264: <https://code.videolan.org/videolan/x264> ·
    x265: <https://bitbucket.org/multicoreware/x265_git/> ·
    other `--enable-lib*` components: their upstream sources (all free/open)
 ## PyInstaller bootloader (inside the bundled MarkItDown binary) — GPL-2.0 with boot-exception
 - Binary shipped: `bin/markitdown` (MarkItDown 0.1.7 frozen with PyInstaller 6.x)
 - PyInstaller grants a special exception allowing the bootloader to be
  embedded in non-GPL frozen applications; source anyway:
  <https://github.com/pyinstaller/pyinstaller>
 - Everything frozen above the bootloader (markitdown + Python packages +
  CPython runtime) is permissively licensed (MIT/Apache/BSD/PSF/MPL);
  see THIRD-PARTY-NOTICES.md §2 for the list.
 - CPython runtime source: <https://www.python.org/downloads/source/>
  (PSF License — not GPL, listed here for completeness).
 ## libvips (via sharp prebuilt binaries) — LGPL-2.1-or-later
 - Shipped as dynamically-loaded libraries from `@img/*` prebuilts for sharp 0.35.4
 - Source: <https://github.com/libvips/libvips> · prebuilt bundle sources:
  <https://github.com/lovell/sharp-builds>
 - LGPL compliance: the app's own source is public (MIT) and the libraries
  remain separately replaceable files in the installation directory
  (`node_modules/@img/`), satisfying the relinking requirement.
 ---
 _Versions and hashes above correspond to the release this file ships with;
 update them when bumping bundled tool versions._
@@ -0,0 +1,108 @@
 # Third-Party Notices & Licenses
 MarkdownConverter (this app) is MIT-licensed. This document lists the
 third-party components that are **distributed with** the application, their
 licenses, and where to obtain source code. Full license texts for the
 copyleft and font licenses referenced here are in the `third-party-licenses/`
 folder shipped alongside this file (and in the source repository).
 This product includes software developed by third parties under the licenses
 below. Copyright and license notices are reproduced verbatim or referenced
 per each license's terms.
 ---
 ## 1. This application
 **MarkdownConverter** — Copyright (C) 2024-2025 ConcreteInfo (Amit Haridas) —
 MIT License. See the repository `LICENSE` file.
 ---
 ## 2. Bundled external binaries
 These run as separate operating-system processes, launched via `execFile`
 with literal argv (never a shell, never linked into the app).
 | Component | Version | License | Notes |
 |---|---|---|---|
 | Pandoc | 3.9.0.2 | GPL-2.0-or-later | Downloaded at build time by `scripts/download-tools.js` (SHA-256 pinned); license: [GPL-2.0](third-party-licenses/GPL-2.0.txt) |
 | FFmpeg | bundled by `ffmpeg-static` 5.3.0 | **GPL-3.0-or-later build** (`--enable-gpl --enable-libx264/x265`) | License text: <https://ffmpeg.org/legal.html>; source offer below |
 | MarkItDown | 0.1.7 (+ Python deps) | MIT | Microsoft's any-file→Markdown importer, frozen with PyInstaller by `scripts/bundle-markitdown.js`; includes an embedded CPython runtime (PSF license) |
 | sharp / libvips prebuilt binaries | 0.35.4 | Apache-2.0 / **LGPL-2.1-or-later** (libvips) | Dynamically loaded native addon; LGPL compliance: this app's full MIT source is public, enabling relinking; license: [LGPL-2.1](third-party-licenses/LGPL-2.1.txt) |
 | KaTeX (CSS + fonts) | 0.18.5 | MIT | `assets/katex/` |
 | JetBrains Mono, Fira Code fonts | — | SIL OFL 1.1 | `assets/fonts/`; license: [OFL-1.1](third-party-licenses/OFL-1.1.txt) |
 | Electron | 41.x | MIT | and its bundled Chromium (BSD-style licenses) / Node.js (MIT) / OpenSSL (Apache-2.0) — see <https://www.electronjs.org/blog/electron-licensing> |
 ### GPL source availability (GPL §3 offer)
 Corresponding source for every GPL-licensed binary distributed with this app
 is available on written request and from these permanent locations — see
 **[SOURCES.md](SOURCES.md)** for exact versions and URLs.
 ### Python packages inside the bundled MarkItDown binary
 The frozen MarkItDown binary embeds CPython and (each MIT/Apache-2.0/BSD-3/
 PSF/MPL-2.0 licensed unless noted): markitdown, onnxruntime (MIT), numpy
 (BSD-3), magika (Apache-2.0), beautifulsoup4 / soupsieve (MIT), requests
 (Apache-2.0) + urllib3/idna/charset-normalizer, certifi (MPL-2.0),
 markdownify, defusedxml (PSF), protobuf (BSD-3), flatbuffers (Apache-2.0),
 pdfminer.six (MIT), python-docx, python-pptx, openpyxl, extract-msg,
 markdown-it-py / mdurl, pyinstaller (GPL-2.0-with-exception — build tool
 only; its bootloader is embedded, source offer included in SOURCES.md),
 Packaging, six, click, chardet (LGPL — dynamically loadable Python module).
 ---
 ## 3. npm dependencies shipped in the app (runtime)
 | Package | Version | License |
 |---|---|---|
 | @cantoo/pdf-lib | 2.9.1 | MIT |
 | @codemirror/* (autocomplete, commands, lang-*, language, lint, search, state, theme-one-dark, view), codemirror | 6.x | MIT |
 | @replit/codemirror-vim | 6.4.0 | MIT |
 | core-util-is | 1.0.3 | MIT |
 | docx | 9.6.1 | MIT |
 | dompurify | 3.4.14 | (MPL-2.0 OR Apache-2.0) |
 | electron-store | 10.1.0 | MIT |
 | ffmpeg-static | 5.3.0 | GPL-3.0-or-later (binary; see §2) |
 | highlight.js | 11.11.1 | BSD-3-Clause |
 | html2pdf.js | 0.14.0 | MIT |
 | jszip | 3.10.1 | (MIT OR GPL-3.0-or-later) |
 | katex | 0.18.5 | MIT |
 | marked, marked-footnote, marked-highlight | 17.x / 1.4 / 2.2 | MIT |
 | mermaid | 11.17.2 | MIT |
 | pdfjs-dist | 5.5.207 | Apache-2.0 |
 | pdfkit | 0.17.2 | MIT |
 | pizzip | 3.2.0 | (MIT OR GPL-3.0) |
 | sharp | 0.35.4 | Apache-2.0 (+ LGPL libvips binaries; see §2) |
 | simple-git | 3.36.0 | MIT |
 | tslib | 2.8.1 | 0BSD |
 (Development-only dependencies — electron-builder, eslint, prettier, jest,
 cross-env, @testing-library/dom — are not distributed with the application.)
 ## 4. Optional external tools (NOT bundled)
 These are detected and used when the user installs them; no copy is
 distributed with this app, so no redistribution obligations arise:
 - **LibreOffice** (MPL-2.0) — enhanced Office-format conversion
 - **MiKTeX / TeX Live** (LPPL/GPL per component) — LaTeX PDF export
 - **ImageMagick** (Apache-2.0-style) — extra image formats in the universal converter
 - **PlantUML** (GPL-3.0) + a Java runtime — local diagram rendering
 - **Calibre** (`ebook-convert`) — MOBI export
 - **System MarkItDown with `[all]` extras** — audio transcription / OCR
 ## 5. Trademarks
 Product names used to describe compatibility (Pandoc, FFmpeg, LibreOffice,
 MarkItDown, Microsoft, Excel, Word, PowerPoint…) are trademarks of their
 respective owners and are not affiliated with this project.
 ## 6. License texts
 See the `third-party-licenses/` directory: `GPL-2.0.txt`, `LGPL-2.1.txt`,
 `MPL-2.0.txt`, `Apache-2.0.txt`, `OFL-1.1.txt`, `PSF-Python.txt`. MIT and
 BSD-3-Clause texts are short and reproduced in each package's own repository;
 per-package LICENSE files also ship inside `node_modules/` in source form.
@@ -1,5 +1,208 @@
 # PanConverter - Updates & Changelog
 ## Version 4.7.1 (2026-09-05)
 ### New: Export Themes (Word + PDF)
 - Theme picker in the export dialog (basic and advanced mode) for PDF and DOCX:
  **Default (Pandoc), Modern, Classic, Sepia, Minimal, Elegant**
 - PDF: LaTeX header recolors/reformats headings + links (xcolor/titlesec,
  core-TeX packages only); DOCX: styles.xml surgery recolors Heading1-6/Title/
  Subtitle/Hyperlink and swaps heading/body fonts
 - Themes persist in export presets; unknown ids in old presets fall back to
  Default instead of failing the export
 ### Branding
 - New M↓ brand identity: app icons, favicons, tray icon, welcome mark,
  README wordmark (vector kit in assets/markdown-converter-assets/)
 ### Fixes
 - **Windows**: pdfjs text/image extraction failed on Windows —
  standardFontDataUrl is now a proper file:// URL (raw backslash paths
  failed pdfjs's trailing-slash URL validation)
 - **Windows**: sharp temp-file cleanup (EPERM retry), path-separator test
  assertions, and pdfjs test timeouts fixed — the Windows CI job is green
 - FiraCode tooling downloads pinned to the immutable 6.2 release;
  .gitattributes stops CRLF checkout rewriting hash-pinned files
 - macOS pandoc extractor locates the binary in the archive (layout changed)
 - Packaged apps resolve bundled pandoc/markitdown next to the executable
  (resourcesPath lookup was wrong since 4.5 — packaged builds silently used
  system pandoc)
 ---
 ## Version 4.7.0 (2026-09-05)
 ### Bundling & Legal Compliance
 - **MarkItDown is now bundled**: `npm run bundle:markitdown` freezes Microsoft's
  markitdown (MIT) + embedded Python runtime into a single ~75MB per-platform
  binary (`bin/<platform>/markitdown`) via PyInstaller (ML extras excluded);
  the app prefers the bundled binary and falls back to system installs
 - Packaging copies the bundled markitdown for Windows/macOS/Linux alongside Pandoc
 - **THIRD-PARTY-NOTICES.md** — full license inventory of everything distributed
  (bundled binaries, npm runtime deps, fonts, embedded Python packages)
 - **SOURCES.md** — GPL §3(b) written source offer for Pandoc / FFmpeg (GPL build) /
  PyInstaller bootloader, with pinned versions + SHA-256; LGPL relinking note for libvips
 - **third-party-licenses/** — canonical texts: GPL-2.0, LGPL-2.1, MPL-2.0,
  Apache-2.0, OFL-1.1, PSF-Python
 - **Help → Third-Party Notices & Licenses** — in-app viewer for both documents
 - **download-tools.js** now SHA-256 pins and verifies every downloaded artifact
  (post-download and against the cache on every run; hard-fails on mismatch)
 - README gains a "Bundled Dependencies, Legal Notices & Credits" section
 - Large optional tools intentionally NOT bundled (documented): LibreOffice,
  MiKTeX/TeX Live, ImageMagick, PlantUML+JRE, Calibre
 ---
 ## Version 4.6.1 (2026-09-05)
 ### New Features
 - **MarkItDown import** — "File → Import with MarkItDown (Any Format)…" embeds
  Microsoft's [markitdown](https://github.com/microsoft/markitdown) (MIT) as an
  any-file → Markdown path: PDF, DOCX, PPTX, XLSX, Outlook .msg/.eml, EPUB,
  images, CSV/JSON/XML, ZIP; audio transcription and OCR with the `[all]` extras
  - Command auto-resolution: `markitdown` binary, then `python -m markitdown` /
    `python3 -m markitdown` (probed once, cached)
  - Same SEC-1 argv discipline as Pandoc (execFile only, paths never through a shell),
    50MB input cap, 120s timeout, path-sanitized errors that surface markitdown's
    actionable `pip install 'markitdown[...]'` hints
  - Output written next to the source as `<name>.md` (numeric suffix instead of
    overwriting) and opened in a new tab; `markitdown:available` / `markitdown:convert`
    IPC for future renderer flows
 - **AI Assistant: Anthropic-compatible provider** — any base URL speaking the
  Anthropic messages schema (LiteLLM proxies, Bedrock gateways, local servers);
  x-api-key + Bearer auth, keyless proxies supported, tolerates bases with or
  without a trailing `/v1`
 ### Bug Fixes
 - File → Open PDF crashed the PDF editor (null operation matched no section; now
  defaults to Merge)
 - Backlinks panel required the wrong module path (failed at registration)
 - writing-studio engines/panels now await their IPC-backed settings/file backends
  (eliminates `JSON.parse("[object Promise]")` crashes)
 - Manuscript panel's window.prompt (unsupported in Electron) replaced with an
  inline dialog; collaboration comment store made async to match its IO
 ---
 ## Version 4.6.0 (2026-09-05)
 ### New Features
 #### AI Assistant Plugin (multi-provider)
 - Chat sidebar panel with rolling conversation history and insert-reply-into-document
 - Providers: OpenAI, Anthropic, Ollama, LM Studio, and any OpenAI-compatible endpoint
 - All provider traffic proxied through the main process — API keys never enter the renderer and the CSP stays closed to AI endpoints
 - Commands: AI Summarize / Improve / Explain / Translate selection
 - Answers the writing-studio `ai:analyze` contract, finally enabling the Proofread panel
 #### Collaboration Plugin (inline comments)
 - Anchor-based comments stored in `.comments/` sidecar files (never exported, never committed)
 - Comments sidebar panel: add at cursor, list, resolve, delete, jump to anchor
 - Drift detection flags moved/edited anchors; F8 navigates to the next open comment
 #### Local Knowledge Base (wiki-links + backlinks)
 - `[[Note]]`, `[[Note|alias]]`, `[[Note#section]]` render as links in the preview (code blocks excluded)
 - Clicking a wiki-link opens the note or offers to create it
 - Backlinks sidebar panel scans the folder (bounded BFS) for documents linking to the current one
 #### Crash Recovery / Session Restore
 - Open tabs (paths + unsaved buffer content) snapshotted to localStorage, debounced on edits, on tab changes, on unload, and once a minute
 - Restore prompt on launch with per-tab restore, clean-fresh option, and 2MB content budget
 #### Document Version History
 - Every save snapshots the previous on-disk content to `<userData>/versions/`
 - History sidebar panel: list, restore (with safety snapshot), unified diff vs. current, delete, manual "save version now"
 - Per-document pruning (20 versions), path-hash storage, id-validated reads
 #### Editor
 - Vim keybindings (View → Vim Mode, persisted, live toggle via CodeMirror Compartment)
 - Snippet Tab-expansion: type a snippet name and press Tab to insert it
 - Zen Mode word-goal setter (the HUD progress bar finally has UI)
 #### Export / Conversion
 - **Real PDF encryption**: pdf-lib swapped for @cantoo/pdf-lib — encrypt/decrypt/permissions now actually work (UI auto-enables via the capability probe)
 - **XLSX export**: markdown tables → native Excel workbook, one sheet per table (no Pandoc needed)
 - **ODT headers/footers + page size**: real ODF styles.xml patching replaces the empty stub
 - **Local PlantUML rendering**: diagrams render on-machine via the `plantuml` CLI when installed; plantuml.com stays as fallback
 - **KaTeX bundled locally** (CSS + fonts): math renders offline, no CDN calls
 - Writing heatmap (GitHub-style 30-day grid) in the writing-studio Goals panel
 #### Platform
 - Quick Note global scratchpad (Ctrl+Alt+Q, works when unfocused; appends to `notes/quick-notes.md`)
 - Deep link protocol `markdownconverter://open?path=…`
 - REPL confirmation dialog before first code execution per language per session (unsandboxed-execution guard rail)
 - Writing-studio's four sidebar panels (Manuscript/Goals/Snapshots/Proofread) are now actually wired with rail icons
 - Plugin sidebar panels get automatic rail icons via `registerPanel({icon})`
 ### Bug Fixes
 - `Ctrl+Shift+P` collision: PDF (Enhanced) export now `Ctrl+Alt+Shift+P`; Command Palette keeps `Ctrl+Shift+P`
 - Universal Converter's Pandoc tool no longer always reports "not installed" (`checkConverterAvailable` gained a pandoc case with bundled-binary check)
 - CLI headless export: removed dangling `--css` / `--reference-doc` flags that made pandoc exit with an error; `--self-contained` replaced with `--standalone` (Pandoc 3.x)
 - Removed dead "Open Export Options Dialog…" button from the converter dialog
 - Removed duplicate `styles-zen.css` include
 ### Security
 - AI provider requests carry size caps (200KB prompt), timeouts (120s), and user-safe error surfaces
 - Version-history reads validate ids against traversal; history listing requires a valid document path
 - PlantUML local rendering removes the diagram-text exfiltration path when a local CLI exists (CVE-MC-007 follow-up)
 ### Tests
 - New suites: OdtStyling, AiProviders, ai-assistant prompts, collaboration comment-store, wiki-links/backlinks, session-store, XlsxExporter, VersionHistory
 - PDFOperations encryption tests rewritten for the real-encryption reality
 ---
 ## 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
@@ -0,0 +1,93 @@
 Copyright (c) 2014, The Fira Code Project Authors (https://github.com/tonsky/FiraCode)
 This Font Software is licensed under the SIL Open Font License, Version 1.1.
 This license is copied below, and is also available with a FAQ at:
 http://scripts.sil.org/OFL
 -----------------------------------------------------------
 SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
 -----------------------------------------------------------
 PREAMBLE
 The goals of the Open Font License (OFL) are to stimulate worldwide
 development of collaborative font projects, to support the font creation
 efforts of academic and linguistic communities, and to provide a free and
 open framework in which fonts may be shared and improved in partnership
 with others.
 The OFL allows the licensed fonts to be used, studied, modified and
 redistributed freely as long as they are not sold by themselves. The
 fonts, including any derivative works, can be bundled, embedded,
 redistributed and/or sold with any software provided that any reserved
 names are not used by derivative works. The fonts and derivatives,
 however, cannot be released under any other type of license. The
 requirement for fonts to remain under this license does not apply
 to any document created using the fonts or their derivatives.
 DEFINITIONS
 "Font Software" refers to the set of files released by the Copyright
 Holder(s) under this license and clearly marked as such. This may
 include source files, build scripts and documentation.
 "Reserved Font Name" refers to any names specified as such after the
 copyright statement(s).
 "Original Version" refers to the collection of Font Software components as
 distributed by the Copyright Holder(s).
 "Modified Version" refers to any derivative made by adding to, deleting,
 or substituting -- in part or in whole -- any of the components of the
 Original Version, by changing formats or by porting the Font Software to a
 new environment.
 "Author" refers to any designer, engineer, programmer, technical
 writer or other person who contributed to the Font Software.
 PERMISSION & CONDITIONS
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of the Font Software, to use, study, copy, merge, embed, modify,
 redistribute, and sell modified and unmodified copies of the Font
 Software, subject to the following conditions:
 1) Neither the Font Software nor any of its individual components,
 in Original or Modified Versions, may be sold by itself.
 2) Original or Modified Versions of the Font Software may be bundled,
 redistributed and/or sold with any software, provided that each copy
 contains the above copyright notice and this license. These can be
 included either as stand-alone text files, human-readable headers or
 in the appropriate machine-readable metadata fields within text or
 binary files as long as those fields can be easily viewed by the user.
 3) No Modified Version of the Font Software may use the Reserved Font
 Name(s) unless explicit written permission is granted by the corresponding
 Copyright Holder. This restriction only applies to the primary font name as
 presented to the users.
 4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
 Software shall not be used to promote, endorse or advertise any
 Modified Version, except to acknowledge the contribution(s) of the
 Copyright Holder(s) and the Author(s) or with their explicit written
 permission.
 5) The Font Software, modified or unmodified, in part or in whole,
 must be distributed entirely under this license, and must not be
 distributed under any other license. The requirement for fonts to
 remain under this license does not apply to any document created
 using the Font Software.
 TERMINATION
 This license becomes null and void if any of the above conditions are
 not met.
 DISCLAIMER
 THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
 OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
 COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
 DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
 OTHER DEALINGS IN THE FONT SOFTWARE.
@@ -0,0 +1,93 @@
 Copyright 2020 The JetBrains Mono Project Authors (https://github.com/JetBrains/JetBrainsMono)
 This Font Software is licensed under the SIL Open Font License, Version 1.1.
 This license is copied below, and is also available with a FAQ at:
 https://scripts.sil.org/OFL
 -----------------------------------------------------------
 SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
 -----------------------------------------------------------
 PREAMBLE
 The goals of the Open Font License (OFL) are to stimulate worldwide
 development of collaborative font projects, to support the font creation
 efforts of academic and linguistic communities, and to provide a free and
 open framework in which fonts may be shared and improved in partnership
 with others.
 The OFL allows the licensed fonts to be used, studied, modified and
 redistributed freely as long as they are not sold by themselves. The
 fonts, including any derivative works, can be bundled, embedded, 
 redistributed and/or sold with any software provided that any reserved
 names are not used by derivative works. The fonts and derivatives,
 however, cannot be released under any other type of license. The
 requirement for fonts to remain under this license does not apply
 to any document created using the fonts or their derivatives.
 DEFINITIONS
 "Font Software" refers to the set of files released by the Copyright
 Holder(s) under this license and clearly marked as such. This may
 include source files, build scripts and documentation.
 "Reserved Font Name" refers to any names specified as such after the
 copyright statement(s).
 "Original Version" refers to the collection of Font Software components as
 distributed by the Copyright Holder(s).
 "Modified Version" refers to any derivative made by adding to, deleting,
 or substituting -- in part or in whole -- any of the components of the
 Original Version, by changing formats or by porting the Font Software to a
 new environment.
 "Author" refers to any designer, engineer, programmer, technical
 writer or other person who contributed to the Font Software.
 PERMISSION & CONDITIONS
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of the Font Software, to use, study, copy, merge, embed, modify,
 redistribute, and sell modified and unmodified copies of the Font
 Software, subject to the following conditions:
 1) Neither the Font Software nor any of its individual components,
 in Original or Modified Versions, may be sold by itself.
 2) Original or Modified Versions of the Font Software may be bundled,
 redistributed and/or sold with any software, provided that each copy
 contains the above copyright notice and this license. These can be
 included either as stand-alone text files, human-readable headers or
 in the appropriate machine-readable metadata fields within text or
 binary files as long as those fields can be easily viewed by the user.
 3) No Modified Version of the Font Software may use the Reserved Font
 Name(s) unless explicit written permission is granted by the corresponding
 Copyright Holder. This restriction only applies to the primary font name as
 presented to the users.
 4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
 Software shall not be used to promote, endorse or advertise any
 Modified Version, except to acknowledge the contribution(s) of the
 Copyright Holder(s) and the Author(s) or with their explicit written
 permission.
 5) The Font Software, modified or unmodified, in part or in whole,
 must be distributed entirely under this license, and must not be
 distributed under any other license. The requirement for fonts to
 remain under this license does not apply to any document created
 using the Font Software.
 TERMINATION
 This license becomes null and void if any of the above conditions are
 not met.
 DISCLAIMER
 THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
 OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
 COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
 DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
 OTHER DEALINGS IN THE FONT SOFTWARE.
@@ -0,0 +1,95 @@
 # Markdown Converter — Brand Assets
 Visual identity for [markdown-converter](https://github.com/amitwh/markdown-converter): a cross-platform Markdown editor & document converter powered by Pandoc.
 ## Concept
 The mark is a stylized **M** whose right descender becomes a downward chevron — a literal "**M↓**" for **Markdown**, suggesting the source document flowing downward into rendered output (PDF, DOCX, PPTX, …).
 The palette is a vibrant orange-to-deep-orange gradient (`#FB923C → #C2410C`) on a white mark — warm, energetic, distinctive. The mark itself is **white** on light surfaces, and a luminous peach-to-orange gradient (`#FFEDD5 → #FB923C`) on dark surfaces.
 ## Files
 ### App icon (vector, primary)
 These are **true SVG app icons** — clean vector paths, no rasters. Drop them straight into a macOS/Windows/Linux app bundle, a PWA manifest, an iOS asset catalog, an Electron build, or any HTML page.
 | File | Use it for |
 | --- | --- |
 | `app-icon.svg` | **Primary app icon.** Emerald→teal vertical gradient, subtle white highlight upper-left, white M↓ mark. |
 | `app-icon-dark.svg` | **Dark-mode app icon.** Charcoal gradient background, soft teal radial glow upper-left, mint-to-emerald gradient on the M↓ mark. |
 | `app-icon-flat.svg` | **Flat solid variant.** Single emerald background, white M↓ mark. Use when you can't render gradients (print, stickers, single-color contexts). |
 ### Logo (wordmark)
 | File | Use it for |
 | --- | --- |
 | `logo-horizontal.jpg` (2752×1536) | High-res raster master. README hero, press kit. |
 | `logo-horizontal-1600w.jpg` (1600×893) | Web-ready compressed version. |
 | `logo-horizontal.svg` | Vector wordmark. Use in HTML, CSS, anywhere that needs to scale. |
 ### Vector mark (for code & inline use)
 | File | Use it for |
 | --- | --- |
 | `mark.svg` | Gradient SVG mark. Drop into HTML, use as a UI element, or rasterize at any size. |
 | `mark-mono.svg` | Monochrome SVG. Uses `currentColor` — style it from CSS (`color: white;`) for any single-color context. |
 | `mark-standalone.jpg` (2048×2048) | Raster M↓ on white, for places that need a PNG (GitHub avatar, doc thumbnails). |
 ### Favicons (rasterized from `app-icon.svg`)
 In the `favicons/` directory:
 | File | Use it for |
 | --- | --- |
 | `favicon.ico` | Legacy `.ico` (16/32/48/64 embedded). Drop at the site root. |
 | `favicon-16x16.png`, `favicon-32x32.png`, `favicon-48x48.png` | Standard browser favicons. |
 | `apple-touch-icon.png` (180×180) | iOS home screen & "Add to Home Screen". |
 | `icon-192.png`, `icon-512.png` | Android home screen, PWA manifest, web app. |
 ### Social preview
 | File | Use it for |
 | --- | --- |
 | `og-social-preview-1200x630.jpg` | **GitHub social preview** — set as the repository's social card image (Settings → Social preview). Also works as Open Graph / Twitter Card. |
 ## Usage in the repo
 Drop the vector icons + favicon set into the repo root or a `/brand` folder, then in `README.md`:
 ```markdown
 <p align="left">
  <img src="./brand/app-icon.svg" width="80" alt="Markdown Converter">
 </p>
 ```
 For the favicon, in `index.html` (or any HTML site):
 ```html
 <link rel="icon" type="image/x-icon" href="/favicon.ico">
 <link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png">
 <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png">
 ```
 For an Electron app, point `build.icon` at the SVG (or a 512×512 PNG export):
 ```json
 {
  "build": {
    "icon": "brand/icon-512.png"
  }
 }
 ```
 ## Color tokens
 ```
 --mc-orange-400: #FB923C   /* gradient start (light) */
 --mc-orange-700: #C2410C   /* gradient end   (light) */
 --mc-orange-500: #F97316   /* flat / accent        */
 --mc-peach-100:  #FFEDD5   /* dark-mode mark start */
 --mc-orange-300: #FDBA74   /* dark-mode mark mid   */
 --mc-ink-900:    #0F172A   /* primary text         */
 --mc-ink-500:    #475569   /* secondary text       */
 --mc-ink-400:    #94A3B8   /* tagline / muted      */
 ```
@@ -0,0 +1,27 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1024 1024" role="img" aria-label="Markdown Converter app icon (dark)">
  <title>Markdown Converter (dark)</title>
  <defs>
    <linearGradient id="darkBg" x1="0" y1="0" x2="0" y2="1024" gradientUnits="userSpaceOnUse">
      <stop offset="0%" stop-color="#1C1917"/>
      <stop offset="100%" stop-color="#0C0A09"/>
    </linearGradient>
    <radialGradient id="darkGlow" cx="280" cy="180" r="780" gradientUnits="userSpaceOnUse">
      <stop offset="0%" stop-color="#EA580C" stop-opacity="0.65"/>
      <stop offset="60%" stop-color="#9A3412" stop-opacity="0.15"/>
      <stop offset="100%" stop-color="#9A3412" stop-opacity="0"/>
    </radialGradient>
    <linearGradient id="darkMark" x1="0" y1="180" x2="0" y2="844" gradientUnits="userSpaceOnUse">
      <stop offset="0%" stop-color="#FFEDD5"/>
      <stop offset="100%" stop-color="#FB923C"/>
    </linearGradient>
  </defs>
  <rect width="1024" height="1024" rx="224" ry="224" fill="url(#darkBg)"/>
  <rect width="1024" height="1024" rx="224" ry="224" fill="url(#darkGlow)"/>
  <g transform="translate(154, 176) scale(7.16)" fill="none" stroke="url(#darkMark)" stroke-width="9" stroke-linecap="round" stroke-linejoin="round">
    <line x1="26" y1="22" x2="26" y2="72"/>
    <line x1="63" y1="22" x2="63" y2="75"/>
    <polyline points="22,18 44.5,56 67,18"/>
    <polyline points="48,60 63,76 78,60"/>
  </g>
 </svg>
@@ -0,0 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1024 1024" role="img" aria-label="Markdown Converter app icon (flat)">
  <title>Markdown Converter (flat)</title>
  <rect width="1024" height="1024" rx="224" ry="224" fill="#F97316"/>
  <g transform="translate(154, 176) scale(7.16)" fill="none" stroke="#FFFFFF" stroke-width="9" stroke-linecap="round" stroke-linejoin="round">
    <line x1="26" y1="22" x2="26" y2="72"/>
    <line x1="63" y1="22" x2="63" y2="75"/>
    <polyline points="22,18 44.5,56 67,18"/>
    <polyline points="48,60 63,76 78,60"/>
  </g>
 </svg>
@@ -0,0 +1,22 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1024 1024" role="img" aria-label="Markdown Converter app icon">
  <title>Markdown Converter</title>
  <defs>
    <linearGradient id="iconBg" x1="0" y1="0" x2="0" y2="1">
      <stop offset="0%" stop-color="#FB923C"/>
      <stop offset="100%" stop-color="#C2410C"/>
    </linearGradient>
    <radialGradient id="iconHighlight" cx="0.28" cy="0.18" r="0.55">
      <stop offset="0%" stop-color="#FFFFFF" stop-opacity="0.28"/>
      <stop offset="60%" stop-color="#FFFFFF" stop-opacity="0"/>
    </radialGradient>
  </defs>
  <rect width="1024" height="1024" rx="224" ry="224" fill="url(#iconBg)"/>
  <rect width="1024" height="1024" rx="224" ry="224" fill="url(#iconHighlight)"/>
  <g transform="translate(154, 176) scale(7.16)" fill="none" stroke="#FFFFFF" stroke-width="9" stroke-linecap="round" stroke-linejoin="round">
    <line x1="26" y1="22" x2="26" y2="72"/>
    <line x1="63" y1="22" x2="63" y2="75"/>
    <polyline points="22,18 44.5,56 67,18"/>
    <polyline points="48,60 63,76 78,60"/>
  </g>
 </svg>
--- a/Show More
+++ b/Show More