fix(test): use mockRejectedValue for IPC error in ExportPdfDialog test

test(renderer): Phase 8 toasts integration smoke test
feat(renderer): export dialogs toast on success/failure
2026-08-02 18:10:18 +05:30 · 2026-06-05 23:17:57 +05:30 · 2026-06-05 23:12:26 +05:30 · 2026-06-05 23:05:32 +05:30 · 2026-06-05 22:59:54 +05:30 · 2026-06-05 22:52:04 +05:30
130 changed files with 12720 additions and 24 deletions
@@ -0,0 +1,399 @@
+# Phase 7 — Modals Design
+
+> Companion to the parent plan: `docs/superpowers/plans/2026-06-05-react-ui-redesign.md` (Phases 7+8+9+10 are sketched there at high level; this spec locks Phase 7's architecture, file map, and contracts so it can be planned task-by-task.)
+
+**Date:** 2026-06-05
+**Phase:** 7 of 10 (React + shadcn/ui UI redesign)
+**Tag (on completion):** `phase-7-modals`
+
+---
+
+## 1. Goal & Non-Goals
+
+**Goal:** Add a layered modal system to the React renderer. Wire 7 modal types (SettingsSheet + 4 Export dialogs + About + Welcome + Confirm) to a single `<ModalLayer />`. Add a persisted `useSettingsStore` for user preferences. The modals are opened via the command store (Phase 6 pattern), and the modals themselves read/write settings via the new store.
+
+**Non-goals (Phase 7):**
+- Implement the actual export pipelines (PDF/DOCX/HTML/PNG generation) — those are main-process concerns, already implemented. Phase 7 only adds the renderer-side dialog UI.
+- Real plugin system — the Plugins tab is a placeholder ("Coming soon").
+- Toast notifications — Phase 8.
+- Advanced tools (Zen mode, REPL, ASCII/Table generators, Print preview) — Phase 9.
+
+---
+
+## 2. Architecture
+
+### 2.1 Modal state lives in `useAppStore` (extended, not new store)
+
+`useAppStore` is already the "global UI" store (sidebar, preview, zen, paneSizes). It's the right home for modal state because:
+- It's already mounted.
+- It's already persisted (via `zustand persist` with `partialize` for pane sizes).
+- A separate `useUIStore` would be YAGNI.
+
+**Add to `AppState`:**
+- `modal: ModalState` (discriminated union — see §2.2)
+- `openModal: <K extends ModalKind>(kind: K, props?: ModalPropsFor<K>) => void`
+- `closeModal: () => void`
+
+**Persistence:** `modal` is **runtime-only**, like `userBindings` in `useCommandStore`. We add it to the `partialize` function so only the persisted fields (`sidebarVisible`, `previewVisible`, `zenMode`, `paneSizes`) are saved. The modal kind never needs to survive a reload.
+
+### 2.2 Discriminated-union modal shape
+
+```ts
+export type ModalState =
+  | { kind: null }
+  | { kind: 'export-pdf';     props: { sourcePath: string } }
+  | { kind: 'export-docx';    props: { sourcePath: string } }
+  | { kind: 'export-html';    props: { sourcePath: string } }
+  | { kind: 'export-batch';   props: { sourcePaths: string[] } }
+  | { kind: 'settings' }
+  | { kind: 'about' }
+  | { kind: 'welcome' }
+  | { kind: 'confirm';        props: ConfirmProps };
+
+export interface ConfirmProps {
+  title: string;
+  body: string;
+  confirmLabel?: string;       // default "Confirm"
+  cancelLabel?: string;        // default "Cancel"
+  destructive?: boolean;       // switches confirm button to red variant
+  onConfirm: () => void | Promise<void>;
+  onCancel?: () => void;
+}
+```
+
+**Why a discriminated union:** every component that opens a modal must pass the right `props` shape for the `kind` — TypeScript catches mismatches at compile time. A generic `{ open: boolean, type: string }` shape would defer the error to runtime.
+
+### 2.3 Single `<ModalLayer />`
+
+Mounted at the bottom of `App.tsx`. Reads `modal.kind` from `useAppStore`, renders the matching component (or `null`). Each child modal calls `closeModal()` on dismiss.
+
+```tsx
+// src/renderer/components/modals/ModalLayer.tsx (sketch)
+export function ModalLayer() {
+  const modal = useAppStore((s) => s.modal);
+  switch (modal.kind) {
+    case null: return null;
+    case 'export-pdf':   return <ExportPdfDialog {...modal.props} />;
+    // ... etc
+  }
+}
+```
+
+`<ModalLayer />` ensures only one modal is visible at a time (the store only holds one). This is correct for v1 — no need for stacking/replacement transitions in Phase 7.
+
+### 2.4 Settings store (new, separate)
+
+A new `useSettingsStore` for user preferences. **Why separate from `useAppStore`:** settings is a different lifecycle. `useAppStore` is "current view configuration"; `useSettingsStore` is "user preferences that survive across sessions and are read by many features". Same precedent as `useFileStore` (file tree state) being separate from `useAppStore` (UI chrome state).
+
+**Persistence:** `zustand persist` with `partialize` to serialize only the leaf settings (matching the pattern in `useFileStore` and `useCommandStore`).
+
+```ts
+interface SettingsState {
+  // Editor
+  fontSize: number;            // 12-20, default 14
+  tabSize: number;             // 2 | 4 | 8, default 4
+  lineNumbers: boolean;        // default true
+  wordWrap: boolean;           // default true
+  minimap: boolean;            // default true
+  // Theme
+  theme: 'light' | 'dark' | 'auto';  // default 'auto'
+  accentColor: 'brand' | 'blue' | 'green' | 'purple' | 'orange';  // default 'brand'
+  fontFamily: 'system' | 'jetbrains' | 'fira';  // default 'system'
+  // Export
+  pdfFormat: 'letter' | 'a4' | 'legal';  // default 'a4'
+  pdfMargins: 'normal' | 'narrow' | 'wide';  // default 'normal'
+  pdfEmbedFonts: boolean;       // default true
+  docxTemplate: 'standard' | 'minimal' | 'modern';  // default 'standard'
+  htmlHighlightStyle: 'github' | 'monokai' | 'nord' | 'none';  // default 'github'
+  // ASCII table formatting — applies to all 3 single-file export formats
+  renderTablesAsAscii: boolean;  // default false
+  // First-launch / Welcome
+  welcomeDismissed: boolean;    // default false
+  // Actions
+  setSetting: <K extends keyof Omit<SettingsState, ...>>(...);
+  resetToDefaults: () => void;
+}
+```
+
+**Template-based exports** (per user request): `docxTemplate` is one of `'standard' | 'minimal' | 'modern'`. The export dialog shows a Select with the available templates. The IPC layer (`ipc.export.docx`) already accepts a `template` field; Phase 7 just exposes it. The main process maps these template names to actual `.docx` template files bundled with the app.
+
+**ASCII table formatting** (per user request): `renderTablesAsAscii` is a toggle in the Settings sheet (Export tab) and in each of the 3 single-file export dialogs as an inline checkbox override. When true, the markdown AST's table nodes are converted to fixed-width monospace text (using a small `lib/ascii-table.ts` helper) *before* the export pipeline sees them. The preview pane is unaffected — this is export-time only.
+
+### 2.5 WelcomeDialog trigger logic
+
+A small `useEffect` in `App.tsx`:
+```ts
+useEffect(() => {
+  if (!useSettingsStore.getState().welcomeDismissed) {
+    useAppStore.getState().openModal('welcome');
+  }
+}, []);  // run once on mount
+```
+
+The Help menu registers a `help.welcome` command that simply calls `openModal('welcome')` — does NOT reset the `welcomeDismissed` flag. (Decision in §2.4 of the brainstorming.)
+
+### 2.6 Commands trigger modals
+
+The command store (Phase 6) gets new commands. Registered in `src/renderer/lib/commands/register-menu-commands.ts`:
+
+| Command ID       | Handler                                              |
+|------------------|------------------------------------------------------|
+| `file.exportPdf`     | `openModal('export-pdf', { sourcePath: activePath })`  |
+| `file.exportDocx`    | `openModal('export-docx', { sourcePath: activePath })` |
+| `file.exportHtml`    | `openModal('export-html', { sourcePath: activePath })` |
+| `file.exportBatch`   | `openModal('export-batch', { sourcePaths: openFiles })` |
+| `settings.open`      | `openModal('settings')`                                  |
+| `help.welcome`       | `openModal('welcome')`                                   |
+| `help.about`         | `openModal('about')`                                     |
+| `file.confirmClose`  | opens confirm dialog before closing a dirty tab        |
+| `app.quit`           | opens confirm if dirty tabs exist, else quits          |
+
+`settings.open` and `help.about` also get buttons in `AppHeader` (already partly done in Phase 6 — we just add new icons and wire to the new commands).
+
+---
+
+## 3. File Map
+
+### 3.1 shadcn primitives (manually created, per the shadcn-CLI-blocked memory)
+
+Created in `src/renderer/components/ui/`:
+- `dialog.tsx`         — Radix Dialog wrapper with motion preset
+- `sheet.tsx`          — Radix Dialog (side variant) for SettingsSheet
+- `tabs.tsx`           — Radix Tabs for the 5-tab SettingsSheet
+- `input.tsx`          — text input
+- `textarea.tsx`       — multi-line input (for confirm body, welcome copy)
+- `select.tsx`         — Radix Select for theme/font/template pickers
+- `switch.tsx`         — Radix Switch for boolean settings
+- `checkbox.tsx`       — Radix Checkbox for "don't show again" toggles
+- `slider.tsx`         — Radix Slider for fontSize
+- `label.tsx`          — Radix Label (always pair with form fields)
+- `form.tsx`           — react-hook-form glue components (FormField, FormItem, FormLabel, FormControl, FormDescription, FormMessage)
+- `radio-group.tsx`    — Radix RadioGroup for accent color / template
+
+### 3.2 Modals (`src/renderer/components/modals/`)
+
+- `ModalLayer.tsx`               — root, mounted by `App.tsx`
+- `ExportPdfDialog.tsx`          — PDF options (format, margins, embed fonts, ascii tables)
+- `ExportDocxDialog.tsx`         — DOCX options (template picker: standard/minimal/modern, ascii tables)
+- `ExportHtmlDialog.tsx`         — HTML options (standalone, highlight style, ascii tables)
+- `ExportBatchDialog.tsx`        — batch queue (format, concurrency, file list)
+- `SettingsSheet.tsx`            — 5-tab sheet (side="right", 480px wide)
+  - `EditorSettings.tsx`         — font size, tab size, line numbers, word wrap, minimap
+  - `ThemeSettings.tsx`          — light/dark/auto, accent color, font family
+  - `ExportSettings.tsx`         — pdf format, margins, embed fonts, docx template, html highlight, ascii tables
+  - `PluginsSettings.tsx`        — "Coming soon" placeholder
+  - `AboutSettings.tsx`          — app version, links, acknowledgements
+- `AboutDialog.tsx`              — simple read-only dialog with version + GitHub link
+- `WelcomeDialog.tsx`            — first-launch dialog with quick-start cards
+- `ConfirmDialog.tsx`            — generic confirmation (title, body, destructive, onConfirm)
+- `ExportDialogFooter.tsx`       — shared Cancel / Export button row used by the 4 export dialogs
+- `useExportSource.ts`           — shared hook: reads active buffer, validates, returns source string + path
+
+### 3.3 Stores
+
+- **Modify** `src/renderer/stores/app-store.ts` — add `modal` + `openModal` + `closeModal`; update `partialize` to exclude `modal`
+- **Create** `src/renderer/stores/settings-store.ts` — new
+
+### 3.4 Lib
+
+- **Create** `src/renderer/lib/validators.ts` — zod schemas:
+  - `settingsSchema` (whole settings object)
+  - `exportPdfSchema` (format, margins, embedFonts, renderTablesAsAscii)
+  - `exportDocxSchema` (template, renderTablesAsAscii)
+  - `exportHtmlSchema` (standalone, highlightStyle, renderTablesAsAscii)
+  - `exportBatchSchema` (format, concurrency, file list)
+  - `confirmPropsSchema` (for the confirm dialog)
+- **Create** `src/renderer/lib/ascii-table.ts` — `toAsciiTable(rows: string[][]): string` (the small helper that converts a 2D string array to a fixed-width ASCII table)
+- **Create** `src/renderer/lib/modal-triggers.ts` — small helpers: `useWelcomeTrigger()`, `useQuitGuard()`
+
+### 3.5 Modified files
+
+- **Modify** `src/renderer/App.tsx` — mount `<ModalLayer />` at the bottom; add the `useWelcomeTrigger` `useEffect` for first-launch
+- **Modify** `src/renderer/lib/commands/register-menu-commands.ts` — add the 9 new commands (4 export + settings + welcome + about + confirmClose + quit)
+- **Modify** `src/renderer/components/layout/AppHeader.tsx` — add Settings (gear) and About (info) icon buttons that dispatch the new commands
+- **Modify** `src/main.js` (verify) — no changes expected; menu items already wire to `menu:action` channels that flow through `useBridgeNativeMenu`. If any new menu items need IPC channels, add them in the main process mirror.
+
+### 3.6 Tests
+
+**Unit (`tests/unit/`):**
+- `stores/settings-store.test.ts` (5-6 tests: defaults, setSetting, resetToDefaults, persistence/partialize)
+- `stores/app-store.test.ts` extended (3 tests: openModal sets state, closeModal clears, only one modal at a time)
+- `lib/validators.test.ts` (3 tests: each schema rejects bad input)
+- `lib/ascii-table.test.ts` (3 tests: simple table, alignment, empty input)
+
+**Component (`tests/component/modals/`):**
+- `ExportPdfDialog.test.tsx` (4 tests: renders with default settings, submit calls ipc.export.pdf with merged opts, error renders inline, ascii-table toggle flows through)
+- `ExportDocxDialog.test.tsx` (3 tests: renders, submit includes template, ascii-table toggle)
+- `ExportHtmlDialog.test.tsx` (3 tests: renders, highlight style select, ascii-table toggle)
+- `ExportBatchDialog.test.tsx` (3 tests: renders file list, format selector, concurrency)
+- `SettingsSheet.test.tsx` (6 tests: renders 5 tabs, each tab shows correct fields, settings change persists)
+- `AboutDialog.test.tsx` (2 tests: renders version, links open external)
+- `WelcomeDialog.test.tsx` (3 tests: renders, dismiss sets welcomeDismissed, "don't show again" checked)
+- `ConfirmDialog.test.tsx` (3 tests: confirm calls onConfirm and closes, cancel calls closeModal, destructive variant)
+- `ModalLayer.test.tsx` (3 integration tests: null kind renders nothing, switching kinds replaces modal, modal unmounts on close)
+
+**Integration (`tests/integration/`):**
+- `phase7-modals-smoke.test.tsx` (4 tests: dispatch command opens modal, command store + settings store + IPC all wired, app.tsx mount triggers welcome on first launch, modal layer end-to-end)
+
+---
+
+## 4. Data Flow
+
+### 4.1 Open a modal
+```ts
+// From any command handler in register-menu-commands.ts:
+useAppStore.getState().openModal('export-pdf', { sourcePath: activePath });
+```
+
+### 4.2 The dialog reads source
+```ts
+// ExportPdfDialog.tsx
+const { source, path } = useExportSource();
+if (!source) return <EmptySourceFallback />;
+```
+
+`useExportSource` is a small hook that:
+1. Reads `useFileStore.activeTabId` + `useEditorStore.buffers`
+2. If no active buffer, prompts the user to open a file (uses confirm dialog)
+3. Returns `{ source: string, path: string } | null`
+
+### 4.3 Settings change
+```ts
+// EditorSettings.tsx — switches/inputs call setSetting
+const [fontSize, setFontSize] = useSettingsStore(s => [s.fontSize, s.setSetting]);
+// or
+setSetting('fontSize', 16);
+```
+
+Editor and preview subscribe to specific slices. The `useTheme` hook from `next-themes` is augmented to read `theme: 'light' | 'dark' | 'auto'` from `useSettingsStore` (replacing the standalone next-themes default).
+
+### 4.4 Export flow
+```ts
+// ExportPdfDialog on submit:
+const settings = useSettingsStore.getState();
+const result = await ipc.export.pdf({
+  inputPath: path,
+  outputPath: chosenOutputPath,
+  format: dialogFormat ?? settings.pdfFormat,
+  margins: MARGIN_PRESETS[dialogMargins ?? settings.pdfMargins],
+  embedFonts: dialogEmbed ?? settings.pdfEmbedFonts,
+  renderTablesAsAscii: dialogAscii ?? settings.renderTablesAsAscii,
+});
+if (!result.ok) setError(result.error.message);
+else { closeModal(); /* toast in Phase 8 */ }
+```
+
+The dialog-level overrides fall through to settings defaults when not explicitly chosen.
+
+### 4.5 ASCII table transformation
+The transformation happens in the **renderer** (pre-IPC), so the main process doesn't need to know about ASCII mode:
+```ts
+// In ExportPdfDialog before submitting:
+const finalSource = renderTablesAsAscii
+  ? applyAsciiTransform(source)   // walks AST, replaces <table> blocks
+  : source;
+```
+`applyAsciiTransform` is a small function (10-20 lines) that:
+1. Parses markdown source for `|...|` table syntax via a small regex
+2. Replaces each table block with a fenced code block containing the ASCII table
+3. Returns the modified source
+
+(No AST walker needed — markdown tables are line-based and a regex per line + simple width calc is sufficient.)
+
+### 4.6 DOCX template selection
+The dialog shows a Select with 3 options (standard, minimal, modern). The main process maps these names to bundled `.docx` template files. The IPC contract is unchanged — `DocxOptions.template: string` was already defined in `types/ipc.ts` during Phase 1.
+
+### 4.7 Confirm flow
+```ts
+// In a command handler:
+const activeTab = ...;
+if (activeTab?.dirty) {
+  useAppStore.getState().openModal('confirm', {
+    title: 'Discard unsaved changes?',
+    body: `"${activeTab.title}" has unsaved changes. Close without saving?`,
+    confirmLabel: 'Discard',
+    destructive: true,
+    onConfirm: () => doCloseTab(),
+  });
+} else {
+  doCloseTab();
+}
+```
+
+### 4.8 Welcome first-launch
+`useEffect` in `App.tsx` (run once on mount) checks `welcomeDismissed` from `useSettingsStore`. If false, calls `openModal('welcome')`. The Welcome dialog has a "Don't show again" checkbox that sets `welcomeDismissed: true` and closes.
+
+---
+
+## 5. Error Handling
+
+- **IPC errors in export dialogs:** inline error banner below the submit button. `IpcResult<T>` discriminated union makes this easy. Banner shows `result.error.message` and a "Try again" button that re-submits.
+- **Settings validation:** zod schemas in `validators.ts`. Each form field shows `aria-invalid` + red border on error. Form-level errors via react-hook-form's `formState.errors`.
+- **Confirm dialog cancel:** just calls `closeModal()`. No state mutation. Optional `onCancel` callback for "remember my choice" patterns (not used in Phase 7).
+- **Welcome "don't show again":** persists `welcomeDismissed: true`. Help menu can re-open Welcome (without resetting the flag).
+- **Settings corruption on load (bad localStorage data):** `useSettingsStore` is built with a `partialize` that also acts as a whitelist — only known fields are deserialized. Unknown fields are dropped. If a persisted value fails zod validation, fall back to defaults (logged as a warning).
+
+---
+
+## 6. Testing Strategy
+
+TDD per the established pattern (Phases 1-6). Every component test:
+- Renders with empty/default state
+- One happy-path interaction (form submit, button click)
+- One error/edge case (validation fail, IPC error, cancel)
+
+Store tests focus on pure logic (state transitions, persistence, partialize). Settings store test specifically verifies:
+- Defaults match schema
+- `setSetting` works for leaf keys
+- `resetToDefaults` clears to initial state
+- Persisted payload (from `partialize`) contains exactly the leaf fields
+- Hydration from a partial/corrupt payload doesn't throw
+
+Component tests use `render` + `userEvent`, mock `window.electronAPI` for IPC.
+
+ModalLayer integration test verifies:
+1. Mounting with `kind: null` renders nothing (query container, expect empty)
+2. Mounting with `kind: 'about'` renders `<AboutDialog>` (aria-label match)
+3. Switching from `kind: 'about'` to `kind: 'settings'` unmounts About, mounts Settings (verified by role/aria-label transitions)
+4. Confirm dialog calls `onConfirm` and `closeModal` on success
+
+---
+
+## 7. Risks & Open Questions
+
+**Risks:**
+- **Form library complexity.** react-hook-form + zod is powerful but adds learning curve. Mitigation: a single shared `<SettingsForm>` wrapper reduces cognitive load; export dialogs use simple `useState` (no need for the full form infra).
+- **shadcn Dialog animation jank with our motion presets.** Radix Dialog has its own `data-state` attributes for open/closed. We compose with our `modalPop` preset via `forceMount` + Motion. Need to verify no double-animation.
+- **Settings store hydration race.** If a component reads a setting on first render before hydration completes, it gets the default. For Phase 7 this is fine — defaults are sensible.
+
+**Open questions (deferrable):**
+- Should the "ascii table" output include alignment row separators (`+---+---+`) or just be a `| a | b |`-style table? → Decision: use the `|---|` separator form (more compact, common in plain-text email).
+- Should ExportBatchDialog be a Sheet (queue progress) or a Dialog (form)? → Decision: Dialog with a form; progress is shown inline (not a streaming queue). Phase 9 could revisit.
+- Should `welcomeDismissed` be per-user-account or per-install? → Per-install (localStorage). No multi-user concept in v1.
+
+---
+
+## 8. Out of Scope (deferred to later phases)
+
+- Phase 8: Toast notifications on export success/failure (the dialog's inline error is v1; toasts are a follow-up).
+- Phase 9: ASCII art generator (figlet) is separate from ASCII table rendering. This spec is about table formatting.
+- Phase 9: Word export uses a `.docx` template *generation* step (WordExportDialog), not the IPC `ipc.export.docx` path. Distinct.
+- Phase 10: Delete legacy `src/print-preview.js`, `src/wordTemplateExporter.js`, etc.
+
+---
+
+## 9. Success Criteria
+
+Phase 7 is complete when:
+- All listed shadcn primitives exist in `src/renderer/components/ui/` with tests
+- `useSettingsStore` is implemented, tested, and persisted
+- `useAppStore` extended with `modal` discriminated union and tested
+- All 7 modal components implemented, tested, and accessible (aria-labels, keyboard nav)
+- 4 export dialogs (PDF/DOCX/HTML/Batch) all submit through the command store and call IPC correctly
+- `ModalLayer` mounted in `App.tsx` and integrated with command triggers
+- Welcome dialog shows on first launch, dismissible, re-openable from Help menu
+- Confirm dialog used by quit-with-dirty and close-with-dirty flows
+- ASCII table rendering works (toggle in settings, override in export dialogs)
+- DOCX template picker in ExportDocxDialog submits the correct `template` field
+- `npx vite build` succeeds, `npx vitest run` shows **all tests green** (target: +50 new tests, total ~220)
+- Branch tagged `phase-7-modals` and pushed to origin
@@ -0,0 +1,250 @@
+# Phase 8 — Toasts Design
+
+> Companion to the parent plan: `docs/superpowers/plans/2026-06-05-react-ui-redesign.md` (Phases 8+9+10 are sketched at high level; this spec locks Phase 8's architecture, file map, and contracts so it can be planned task-by-task.)
+
+**Date:** 2026-06-05
+**Phase:** 8 of 10 (React + shadcn/ui UI redesign)
+**Tag (on completion):** `phase-8-toasts`
+
+---
+
+## 1. Goal & Non-Goals
+
+**Goal:** Add a toast notification layer to the React renderer using sonner (already installed). Surface user-initiated async action results (file save, file/folder open, exports) as transient toasts in the bottom-right of the window. The error banner pattern in export dialogs stays — toasts are a complementary global channel.
+
+**Non-goals (Phase 8):**
+- Undo/redo support (Phase 9)
+- Custom toast actions/buttons (Phase 9, if needed)
+- Persistent notification history
+- Toast queueing/throttling for rapid-fire events
+- Replacing inline error banners (they stay as per-dialog context)
+
+**Scope decision:** Toast on user-initiated actions only. Skip silent background operations (loadChildren, etc.) to avoid noise. 4 wire points total: save (success+error), open file/folder (error only), 4 export dialogs (success+error).
+
+---
+
+## 2. Architecture
+
+### 2.1 Toast helpers in `lib/toast.ts`
+
+A thin typed layer over sonner. The helpers exist to:
+- Give us a single import surface (instead of scattering `import { toast } from 'sonner'` across the codebase)
+- Provide a place to add brand colors, formatting, or analytics later without touching call sites
+- Make mocking easier in tests (one module to mock)
+
+```ts
+// src/renderer/lib/toast.ts (sketch)
+import { toast as sonnerToast } from 'sonner';
+
+export const toast = {
+  success: (message: string) => sonnerToast.success(message),
+  error: (message: string) => sonnerToast.error(message),
+  info: (message: string) => sonnerToast.info(message),
+  warning: (message: string) => sonnerToast.warning(message),
+  promise: <T>(
+    promise: Promise<T>,
+    msgs: { loading: string; success: string | ((data: T) => string); error: string | ((err: unknown) => string) }
+  ) => sonnerToast.promise(promise, msgs),
+  dismiss: (id?: string | number) => sonnerToast.dismiss(id),
+};
+```
+
+### 2.2 `<Toaster />` mounted in App.tsx
+
+A canonical shadcn Toaster wrapper (manual paste per memory `shadcn-cli-blocked-manual-primitives`). Mounts alongside `<ModalLayer />`:
+
+```tsx
+// src/renderer/App.tsx (sketch)
+import { Toaster } from '@/components/ui/sonner';
+
+function App() {
+  useWelcomeTrigger();
+  return (
+    <>
+      <AppShell />
+      <ModalLayer />
+      <Toaster />
+    </>
+  );
+}
+```
+
+The Toaster uses sonner's `<Toaster />` component with:
+- `theme={resolvedTheme}` from `useTheme()` (so toasts match the user's light/dark preference)
+- `richColors` for semantic success/error/info/warning colors
+- `position="bottom-right"` (sonner default; explicit for clarity)
+- `closeButton` (so users can dismiss)
+
+### 2.3 Inline wiring at 4 wire points
+
+**Pattern choice — inline in stores/dialogs, NOT middleware.** Matches the Phase 7 precedent of inline error banners in export dialogs. Middleware would be DRY but harder to debug and harder to control granularity (we want errors on save, but NOT on silent loadChildren).
+
+**Wire points:**
+
+1. **`useFileStore.saveActiveBuffer`** — wrap the existing logic:
+   ```ts
+   saveActiveBuffer: async () => {
+     // ... existing logic to get buffer ...
+     const writeResult = await ipc.file.write(activeTabId, buffer.content);
+     if (!writeResult.ok) {
+       toast.error(`Failed to save: ${writeResult.error.message}`);
+       return false;
+     }
+     // ... existing markSaved/markTabClean ...
+     toast.success(`Saved ${title}`);
+     return true;
+   }
+   ```
+
+2. **`useFileStore.openFile`** — error only:
+   ```ts
+   openFile: async (filePath) => {
+     // ... existing logic to check existing tab ...
+     const result = await ipc.file.read(filePath);
+     if (!result.ok) {
+       toast.error(`Failed to open file: ${result.error.message}`);
+       return;
+     }
+     // ... existing logic ...
+   }
+   ```
+
+3. **`useFileStore.openFolder`** — error only:
+   ```ts
+   openFolder: async (path) => {
+     const result = await ipc.file.list(path);
+     if (!result.ok) {
+       toast.error(`Failed to open folder: ${result.error.message}`);
+       return;
+     }
+     // ... existing logic ...
+   }
+   ```
+
+4. **4 export dialogs** — both success and error (error complements the inline banner):
+   ```ts
+   if (!result.ok) {
+     toast.error(`Export failed: ${result.error.message}`);
+     setError(result.error.message);
+     setSubmitting(false);
+   } else {
+     toast.success(`Exported ${source.title} to ${result.data?.outputPath ?? 'file'}`);
+     closeModal();
+   }
+   ```
+
+---
+
+## 3. File Map
+
+### 3.1 Created files
+
+- `src/renderer/lib/toast.ts` — typed wrappers (re-export of sonner with our naming)
+- `src/renderer/components/ui/sonner.tsx` — canonical shadcn Toaster wrapper (manual paste)
+- `tests/unit/lib/toast.test.ts` — ~5 unit tests
+- `tests/component/ui/sonner.test.tsx` — 1 smoke test
+- `tests/integration/phase8-toasts-smoke.test.tsx` — ~4 integration tests
+
+### 3.2 Modified files
+
+- `src/renderer/App.tsx` — mount `<Toaster />` alongside `<ModalLayer />`
+- `src/renderer/stores/file-store.ts` — add 3 toast calls (save, openFile, openFolder)
+- `src/renderer/components/modals/ExportPdfDialog.tsx` — toast on submit result
+- `src/renderer/components/modals/ExportDocxDialog.tsx` — toast on submit result
+- `src/renderer/components/modals/ExportHtmlDialog.tsx` — toast on submit result
+- `src/renderer/components/modals/ExportBatchDialog.tsx` — toast on submit result
+
+---
+
+## 4. Data Flow
+
+User action → store action OR export dialog submit → IPC call → result →
+- if error: `toast.error(message)` → sonner renders in bottom-right portal
+- if success: `toast.success(message)` → sonner renders
+- inline error banner in dialog stays as per-dialog context (NOT removed)
+
+Theme comes from `useTheme()` in the Toaster component, not from individual toasts. The Toaster is mounted once at the app level.
+
+For the 4 export dialogs: the existing inline error banner stays (it's contextual to the dialog), AND a toast is fired. This gives the user both immediate context (in the dialog) and persistent notification (toast in corner).
+
+For file save: ONLY a toast (no inline error UI in the editor pane — keeps the editor clean). Errors still show the toast.
+
+---
+
+## 5. Error Handling
+
+- **Toast helpers never throw.** They are thin re-exports of sonner, which handles its own error cases (e.g., render failures, missing portal target).
+- **In tests**, the `toast` module is mocked so calls don't render real toasts. Mock signature: `vi.mock('@/lib/toast', () => ({ toast: { success: vi.fn(), error: vi.fn(), ... } }))`.
+- **Theme fallback:** If `useTheme()` is loading or `resolvedTheme` is undefined, Toaster uses `'system'` as a fallback (sonner's default behavior).
+- **Sonner missing:** If for some reason sonner fails to load, the toast calls become no-ops. The user still sees inline error banners in the export dialogs.
+- **Inline error banners stay.** They are not replaced by toasts — they complement them.
+
+---
+
+## 6. Testing Strategy
+
+### 6.1 Unit tests (`tests/unit/lib/toast.test.ts`)
+
+5 tests:
+- `toast.success` calls sonner `toast.success` with the message
+- `toast.error` calls sonner `toast.error` with the message
+- `toast.info` calls sonner `toast.info`
+- `toast.warning` calls sonner `toast.warning`
+- `toast.promise` forwards the promise and messages to sonner
+
+All tests mock the sonner module and verify the forwarded call.
+
+### 6.2 Component test (`tests/component/ui/sonner.test.tsx`)
+
+1 smoke test: `<Toaster />` renders without crashing inside a ThemeProvider.
+
+### 6.3 Integration test (`tests/integration/phase8-toasts-smoke.test.tsx`)
+
+~4 tests:
+- Saving a file → `toast.success` called with `"Saved test.md"`
+- Opening a non-existent file (ipc returns error) → `toast.error` called with file path in message
+- Export success (ipc returns ok) → `toast.success` called + dialog closes
+- Export failure (ipc returns error) → `toast.error` called + inline banner shown + dialog stays open
+
+TDD throughout. Mocks for `ipc.*` and `lib/toast`.
+
+### 6.4 Existing tests must still pass
+
+- All 243 tests from Phase 7 must remain green
+- Export dialog tests will need updates to verify the new toast calls (the dialog tests currently check for inline banner; they should ALSO verify the toast call)
+
+---
+
+## 7. Risks & Open Questions
+
+**Risks:**
+- **Sonner theme switching:** If `useTheme()` returns `'system'` and the OS preference changes mid-session, sonner will re-render. This is the correct behavior; just confirm in test.
+- **Toast spam:** If user holds Cmd+S, the save could fire many times. Sonner deduplicates by default for similar messages? → Decision: rely on sonner's default behavior. If spam becomes an issue, add a `toast.dismiss()` debounce in v2.
+
+**Open questions (deferrable):**
+- Should we add a custom toast for "undo last close" (Phase 9's undo feature)? → Decision: out of scope for Phase 8. Phase 9 will handle undo toasts.
+- Should the export dialog inline banner be removed once toasts are wired? → Decision: NO — keep both. The inline banner is contextual to the dialog; the toast is global. They serve different purposes.
+
+---
+
+## 8. Out of Scope (deferred to later phases)
+
+- Phase 9: Undo toasts ("Tab closed — Undo" with action button)
+- Phase 9: Long-running operation progress toasts (e.g., batch export queue)
+- Phase 9: Custom toast variants for advanced tools (ASCII generator, table generator)
+- Phase 10: Cleanup of inline error banners (will evaluate in Phase 10 if redundant)
+
+---
+
+## 9. Success Criteria
+
+Phase 8 is complete when:
+- `lib/toast.ts` exists with typed wrappers
+- `<Toaster />` is mounted in `App.tsx` and renders toasts
+- `useFileStore.saveActiveBuffer` calls `toast.success`/`toast.error` on result
+- `useFileStore.openFile` calls `toast.error` on failure
+- `useFileStore.openFolder` calls `toast.error` on failure
+- 4 export dialogs call `toast.success`/`toast.error` on result
+- All tests pass: ~+10 new tests, total ~253
+- `npx vite build` succeeds
+- Branch tagged `phase-8-toasts` and pushed to origin
@@ -98,7 +98,18 @@
    "@dnd-kit/sortable": "^10.0.0",
    "@dnd-kit/utilities": "^3.2.2",
    "@hookform/resolvers": "^5.4.0",
+    "@radix-ui/react-checkbox": "^1.3.3",
+    "@radix-ui/react-collapsible": "^1.1.12",
+    "@radix-ui/react-context-menu": "^2.2.16",
+    "@radix-ui/react-dialog": "^1.1.15",
+    "@radix-ui/react-label": "^2.1.8",
+    "@radix-ui/react-radio-group": "^1.3.8",
+    "@radix-ui/react-scroll-area": "^1.2.10",
+    "@radix-ui/react-select": "^2.2.6",
+    "@radix-ui/react-slider": "^1.3.6",
    "@radix-ui/react-slot": "^1.2.4",
+    "@radix-ui/react-switch": "^1.2.6",
+    "@radix-ui/react-tabs": "^1.1.13",
    "@tanstack/react-table": "^8.21.3",
    "codemirror": "^6.0.2",
    "core-util-is": "^1.0.3",
@@ -3039,6 +3039,55 @@ ipcMain.on('select-folder', (event, type) => {
  }
 });

+// List directory contents as FileEntry[]
+ipcMain.handle('list-directory', async (event, dirPath) => {
+  try {
+    const entries = fs.readdirSync(dirPath, { withFileTypes: true });
+    return entries.map((dirent) => {
+      const fullPath = path.join(dirPath, dirent.name);
+      let size;
+      let modifiedAt;
+      if (!dirent.isDirectory()) {
+        try {
+          const stat = fs.statSync(fullPath);
+          size = stat.size;
+          modifiedAt = stat.mtime.toISOString();
+        } catch {
+          // ignore stat errors
+        }
+      }
+      return {
+        name: dirent.name,
+        path: fullPath,
+        isDirectory: dirent.isDirectory(),
+        size,
+        modifiedAt,
+      };
+    });
+  } catch (err) {
+    return { error: err.message };
+  }
+});
+
+// Show folder picker dialog and return selected path or null
+ipcMain.handle('pick-folder', async () => {
+  const result = await dialog.showOpenDialog(mainWindow, {
+    properties: ['openDirectory'],
+  });
+  if (result.canceled || result.filePaths.length === 0) return null;
+  return result.filePaths[0];
+});
+
+// Show file picker dialog for markdown files and return selected path or null
+ipcMain.handle('pick-file', async () => {
+  const result = await dialog.showOpenDialog(mainWindow, {
+    properties: ['openFile'],
+    filters: [{ name: 'Markdown', extensions: ['md', 'markdown', 'mdown', 'mkd'] }],
+  });
+  if (result.canceled || result.filePaths.length === 0) return null;
+  return result.filePaths[0];
+});
+
 ipcMain.on('export-spreadsheet', (event, { content, format }) => {
  const outputFile = dialog.showSaveDialogSync(mainWindow, {
    defaultPath: currentFile.replace(/\.[^/.]+$/, `.${format}`),
@@ -237,7 +237,12 @@ const ALLOWED_RECEIVE_CHANNELS = [
  'load-template-menu',
  'toggle-command-palette',
  'toggle-sidebar-panel',
-  'toggle-bottom-panel'
+  'toggle-bottom-panel',
+
+  // File dialog / directory listing
+  'list-directory',
+  'pick-folder',
+  'pick-file'
 ];

 /**
@@ -344,7 +349,10 @@ contextBridge.exposeInMainWorld('electronAPI', {
    exists: (filePath) => ipcRenderer.invoke('path-exists', filePath),
    isDirectory: (filePath) => ipcRenderer.invoke('is-directory', filePath),
    copy: (source, destination) => ipcRenderer.invoke('copy-path', { source, destination }),
-    move: (source, destination) => ipcRenderer.invoke('move-path', { source, destination })
+    move: (source, destination) => ipcRenderer.invoke('move-path', { source, destination }),
+    list: (dirPath) => ipcRenderer.invoke('list-directory', dirPath),
+    pickFolder: () => ipcRenderer.invoke('pick-folder'),
+    pickFile: () => ipcRenderer.invoke('pick-file')
  },

  // Theme Operations
@@ -1,26 +1,16 @@
-import { ThemeToggle } from './components/theme-toggle';
-import { Button } from './components/ui/button';
+import { AppShell } from './components/layout/AppShell';
+import { ModalLayer } from './components/modals/ModalLayer';
+import { Toaster } from './components/ui/sonner';
+import { useWelcomeTrigger } from './hooks/use-welcome-trigger';

 function App() {
+  useWelcomeTrigger();
  return (
-    <div className="flex h-screen flex-col bg-background text-foreground">
-      <header className="flex h-14 items-center justify-between border-b border-border px-4">
-        <div className="flex items-center gap-3">
-          <div className="h-7 w-7 rounded-md bg-brand" aria-label="MarkdownConverter logo" />
-          <h1 className="text-sm font-semibold">MarkdownConverter</h1>
-        </div>
-        <div className="flex items-center gap-2">
-          <Button variant="ghost" size="sm">File</Button>
-          <Button variant="ghost" size="sm">Edit</Button>
-          <Button variant="ghost" size="sm">View</Button>
-          <ThemeToggle />
-        </div>
-      </header>
-      <main className="flex flex-1 items-center justify-center text-muted-foreground">
-        <p>Shell skeleton — implementation phases in progress.</p>
-      </main>
-    </div>
+    <>
+      <AppShell />
+      <ModalLayer />
+      <Toaster />
+    </>
  );
 }
-
-export default App;
+export default App;
@@ -0,0 +1,80 @@
+import { useEffect, useRef } from 'react';
+import { EditorState, Compartment } from '@codemirror/state';
+import { EditorView, keymap, lineNumbers, highlightActiveLine, drawSelection } from '@codemirror/view';
+import { defaultKeymap, history, historyKeymap, indentWithTab } from '@codemirror/commands';
+import { markdown, markdownLanguage } from '@codemirror/lang-markdown';
+import { searchKeymap, highlightSelectionMatches } from '@codemirror/search';
+import { autocompletion, completionKeymap } from '@codemirror/autocomplete';
+import { oneDark } from '@codemirror/theme-one-dark';
+import { useTheme } from 'next-themes';
+import { lightTheme, lightHighlight } from './themes/light';
+import { useEditorStore } from '@/stores/editor-store';
+
+interface Props {
+  bufferId: string;
+  initialContent: string;
+  onChange?: (content: string) => void;
+  onCursorChange?: (line: number, column: number) => void;
+}
+
+export function CodeMirrorEditor({ bufferId, initialContent, onChange, onCursorChange }: Props) {
+  const ref = useRef<HTMLDivElement>(null);
+  const viewRef = useRef<EditorView | null>(null);
+  const themeCompartment = useRef(new Compartment());
+  const { resolvedTheme } = useTheme();
+  const updateContent = useEditorStore((s) => s.updateContent);
+  const setCursor = useEditorStore((s) => s.setCursor);
+
+  useEffect(() => {
+    if (!ref.current) return;
+    const state = EditorState.create({
+      doc: initialContent,
+      extensions: [
+        lineNumbers(),
+        highlightActiveLine(),
+        highlightSelectionMatches(),
+        history(),
+        drawSelection(),
+        markdown({ base: markdownLanguage, codeLanguages: [] }),
+        autocompletion(),
+        keymap.of([...defaultKeymap, ...historyKeymap, ...searchKeymap, ...completionKeymap, indentWithTab]),
+        themeCompartment.current.of(resolvedTheme === 'dark' ? [oneDark] : [lightTheme, lightHighlight]),
+        EditorView.lineWrapping,
+        EditorView.updateListener.of((v) => {
+          if (v.docChanged) {
+            const content = v.state.doc.toString();
+            updateContent(bufferId, content);
+            onChange?.(content);
+          }
+          if (v.selectionSet || v.docChanged) {
+            const head = v.state.selection.main.head;
+            const line = v.state.doc.lineAt(head);
+            const lineNo = line.number;
+            const col = head - line.from + 1;
+            setCursor(bufferId, lineNo, col);
+            onCursorChange?.(lineNo, col);
+          }
+        }),
+      ],
+    });
+    const view = new EditorView({ state, parent: ref.current });
+    viewRef.current = view;
+    return () => {
+      view.destroy();
+      viewRef.current = null;
+    };
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [bufferId]);
+
+  useEffect(() => {
+    const view = viewRef.current;
+    if (!view) return;
+    view.dispatch({
+      effects: themeCompartment.current.reconfigure(
+        resolvedTheme === 'dark' ? [oneDark] : [lightTheme, lightHighlight]
+      ),
+    });
+  }, [resolvedTheme]);
+
+  return <div ref={ref} className="h-full overflow-hidden" />;
+}
@@ -0,0 +1,32 @@
+import { useEffect } from 'react';
+import { CodeMirrorEditor } from './CodeMirrorEditor';
+import { useEditorStore } from '@/stores/editor-store';
+import { usePreviewStore } from '@/stores/preview-store';
+
+export function EditorPane() {
+  const { buffers, activeId } = useEditorStore();
+  const buf = activeId ? buffers.get(activeId) : null;
+  const setPreviewSource = usePreviewStore((s) => s.setSource);
+
+  useEffect(() => {
+    if (buf) setPreviewSource(buf.content);
+  }, [buf?.id, buf?.content, buf, setPreviewSource]);
+
+  if (!buf) {
+    return (
+      <div className="flex h-full items-center justify-center bg-background text-muted-foreground">
+        <p>No file open. Use File → Open to start.</p>
+      </div>
+    );
+  }
+
+  return (
+    <div className="h-full">
+      <CodeMirrorEditor
+        key={buf.id}
+        bufferId={buf.id}
+        initialContent={buf.content}
+      />
+    </div>
+  );
+}
@@ -0,0 +1,55 @@
+import { EditorView } from '@codemirror/view';
+import { HighlightStyle, syntaxHighlighting } from '@codemirror/language';
+import { tags as t } from '@lezer/highlight';
+
+const colors = {
+  background: '#ffffff',
+  foreground: '#0d0b09',
+  cursor: '#e5461f',
+  selection: 'rgba(229, 70, 31, 0.15)',
+  gutterBackground: '#fafbfc',
+  gutterForeground: '#7a7878',
+  lineHighlight: 'rgba(0, 0, 0, 0.04)',
+};
+
+export const lightTheme = EditorView.theme(
+  {
+    '&': {
+      backgroundColor: colors.background,
+      color: colors.foreground,
+      height: '100%',
+    },
+    '.cm-content': {
+      caretColor: colors.cursor,
+      fontFamily: 'JetBrains Mono, Fira Code, monospace',
+      fontSize: '13.5px',
+    },
+    '.cm-cursor, .cm-dropCursor': { borderLeftColor: colors.cursor },
+    '&.cm-focused .cm-selectionBackground, .cm-selectionBackground, ::selection': {
+      backgroundColor: colors.selection,
+    },
+    '.cm-gutters': {
+      backgroundColor: colors.gutterBackground,
+      color: colors.gutterForeground,
+      border: 'none',
+    },
+    '.cm-activeLine': { backgroundColor: colors.lineHighlight },
+    '.cm-activeLineGutter': { backgroundColor: 'transparent', color: '#e5461f' },
+  },
+  { dark: false }
+);
+
+const highlightStyle = HighlightStyle.define([
+  { tag: t.heading1, color: '#0d0b09', fontWeight: '700' },
+  { tag: t.heading2, color: '#0d0b09', fontWeight: '700' },
+  { tag: t.heading3, color: '#464646', fontWeight: '600' },
+  { tag: t.link, color: '#e5461f', textDecoration: 'underline' },
+  { tag: t.url, color: '#e5461f' },
+  { tag: t.emphasis, fontStyle: 'italic' },
+  { tag: t.strong, fontWeight: '700' },
+  { tag: t.monospace, color: '#c93a18' },
+  { tag: t.list, color: '#0ea5e9' },
+  { tag: t.quote, color: '#7a7878', fontStyle: 'italic' },
+]);
+
+export const lightHighlight = syntaxHighlighting(highlightStyle);
@@ -0,0 +1,70 @@
+import { PanelLeft, PanelRight, Keyboard, Settings, Info } from 'lucide-react';
+import { Button } from '@/components/ui/button';
+import { ThemeToggle } from '@/components/theme-toggle';
+import { useAppStore } from '@/stores/app-store';
+import { useCommandStore } from '@/stores/command-store';
+
+export function AppHeader() {
+  const { sidebarVisible, previewVisible } = useAppStore();
+  const dispatch = useCommandStore((s) => s.dispatch);
+
+  return (
+    <header className="flex h-14 items-center justify-between border-b border-border bg-card/40 px-4 backdrop-blur">
+      <div className="flex items-center gap-3">
+        <div
+          className="h-7 w-7 rounded-md bg-gradient-to-br from-brand to-brand-dark shadow-[var(--shadow-glow-brand)]"
+          aria-label="MarkdownConverter logo"
+        />
+        <h1 className="font-display text-lg font-bold tracking-tight">MarkdownConverter</h1>
+      </div>
+      <div className="flex items-center gap-1">
+        <Button
+          variant="ghost"
+          size="icon"
+          aria-label="Toggle sidebar"
+          aria-pressed={sidebarVisible}
+          data-testid="header-toggle-sidebar"
+          onClick={() => dispatch('view.toggleSidebar')}
+        >
+          <PanelLeft className="h-4 w-4" />
+        </Button>
+        <Button
+          variant="ghost"
+          size="icon"
+          aria-label="Toggle preview"
+          aria-pressed={previewVisible}
+          data-testid="header-toggle-preview"
+          onClick={() => dispatch('view.togglePreview')}
+        >
+          <PanelRight className="h-4 w-4" />
+        </Button>
+        <Button
+          variant="ghost"
+          size="icon"
+          aria-label="Keyboard shortcuts"
+          data-testid="header-shortcuts"
+          onClick={() => dispatch('shortcuts.show')}
+        >
+          <Keyboard className="h-4 w-4" />
+        </Button>
+        <Button
+          variant="ghost"
+          size="icon"
+          aria-label="Settings"
+          onClick={() => dispatch('settings.open')}
+        >
+          <Settings className="h-4 w-4" />
+        </Button>
+        <Button
+          variant="ghost"
+          size="icon"
+          aria-label="About"
+          onClick={() => dispatch('help.about')}
+        >
+          <Info className="h-4 w-4" />
+        </Button>
+        <ThemeToggle />
+      </div>
+    </header>
+  );
+}
@@ -0,0 +1,59 @@
+import { AppHeader } from './AppHeader';
+import { TabBar } from './TabBar';
+import { Toolbar } from './Toolbar';
+import { Breadcrumb } from './Breadcrumb';
+import { StatusBar } from './StatusBar';
+import { EditorPane } from '@/components/editor/EditorPane';
+import { PreviewPane } from '@/components/preview/PreviewPane';
+import { Sidebar } from '@/components/sidebar/Sidebar';
+import { useAppStore } from '@/stores/app-store';
+import { ResizablePanelGroup, ResizablePanel, ResizableHandle } from '@/components/ui/resizable';
+import { useFileShortcuts } from '@/hooks/use-file-shortcuts';
+import { useRestoreLastFolder } from '@/hooks/use-restore-last-folder';
+import { useRegisterMenuCommands, useBridgeNativeMenu } from '@/lib/commands/register-menu-commands';
+
+export function AppShell() {
+  useFileShortcuts();
+  useRestoreLastFolder();
+  useRegisterMenuCommands();
+  useBridgeNativeMenu();
+  const { sidebarVisible, previewVisible, paneSizes, setPaneSizes } = useAppStore();
+
+  return (
+    <div className="flex h-screen flex-col bg-background text-foreground">
+      <AppHeader />
+      <TabBar />
+      <Toolbar />
+      <Breadcrumb />
+      <main className="flex-1 overflow-hidden">
+        <ResizablePanelGroup
+          direction="horizontal"
+          onLayout={(sizes) => setPaneSizes({ sidebar: sizes[0], editor: sizes[1], preview: sizes[2] })}
+        >
+          {sidebarVisible && (
+            <>
+              <ResizablePanel defaultSize={paneSizes.sidebar} minSize={15} maxSize={40}>
+                <aside className="h-full border-r border-border bg-card/10 p-3 text-sm text-muted-foreground">
+                  <Sidebar />
+                </aside>
+              </ResizablePanel>
+              <ResizableHandle />
+            </>
+          )}
+          <ResizablePanel defaultSize={previewVisible ? paneSizes.editor : 100} minSize={20}>
+            <EditorPane />
+          </ResizablePanel>
+          {previewVisible && (
+            <>
+              <ResizableHandle />
+              <ResizablePanel defaultSize={paneSizes.preview} minSize={20}>
+                <PreviewPane />
+              </ResizablePanel>
+            </>
+          )}
+        </ResizablePanelGroup>
+      </main>
+      <StatusBar />
+    </div>
+  );
+}
@@ -0,0 +1,7 @@
+export function Breadcrumb() {
+  return (
+    <nav aria-label="File path" className="flex h-7 items-center border-b border-border bg-card/10 px-3 text-xs text-muted-foreground">
+      <span>No file selected</span>
+    </nav>
+  );
+}
@@ -0,0 +1,25 @@
+import { useEditorStore } from '@/stores/editor-store';
+
+function countWords(text: string): number {
+  return text.trim().length === 0 ? 0 : text.trim().split(/\s+/).length;
+}
+
+export function StatusBar() {
+  const { buffers, activeId } = useEditorStore();
+  const buf = activeId ? buffers.get(activeId) : null;
+  const wordCount = buf ? countWords(buf.content) : 0;
+  const cursor = buf?.cursor ?? { line: 1, column: 1 };
+
+  return (
+    <footer className="flex h-7 items-center justify-between border-t border-border bg-card/20 px-3 text-xs text-muted-foreground">
+      <div className="flex items-center gap-4">
+        <span>{wordCount} words</span>
+        <span>UTF-8</span>
+      </div>
+      <div className="flex items-center gap-4">
+        <span>Ln {cursor.line}, Col {cursor.column}</span>
+        <span>Markdown</span>
+      </div>
+    </footer>
+  );
+}
@@ -0,0 +1,127 @@
+import { X } from 'lucide-react';
+import {
+  DndContext,
+  PointerSensor,
+  useSensor,
+  useSensors,
+  closestCenter,
+  type DragEndEvent,
+} from '@dnd-kit/core';
+import {
+  SortableContext,
+  horizontalListSortingStrategy,
+  useSortable,
+} from '@dnd-kit/sortable';
+import { CSS } from '@dnd-kit/utilities';
+import { useFileStore, type OpenTab } from '@/stores/file-store';
+import { cn } from '@/lib/utils';
+
+function SortableTab({
+  tab,
+  isActive,
+  onSelect,
+  onClose,
+}: {
+  tab: OpenTab;
+  isActive: boolean;
+  onSelect: (id: string) => void;
+  onClose: (id: string) => void;
+}) {
+  const { attributes, listeners, setNodeRef, transform, transition, isDragging } = useSortable({
+    id: tab.id,
+  });
+
+  const style = {
+    transform: CSS.Transform.toString(transform),
+    transition,
+    opacity: isDragging ? 0.5 : 1,
+  };
+
+  return (
+    <div
+      ref={setNodeRef}
+      style={style}
+      {...attributes}
+      {...listeners}
+      role="tab"
+      aria-selected={isActive}
+      aria-current={isActive ? 'page' : undefined}
+      data-testid={`tab-${tab.id}`}
+      className={cn(
+        'group flex h-full cursor-pointer select-none items-center gap-1 border-r border-border px-3 text-xs transition-colors',
+        isActive
+          ? 'bg-accent text-accent-foreground'
+          : 'text-muted-foreground hover:bg-muted/50 hover:text-foreground'
+      )}
+      onClick={() => onSelect(tab.id)}
+    >
+      {tab.dirty && (
+        <span
+          className="h-1.5 w-1.5 shrink-0 rounded-full bg-primary"
+          aria-label="Unsaved changes"
+        />
+      )}
+      <span className="max-w-[120px] truncate">{tab.title}</span>
+      <button
+        aria-label={`Close ${tab.title}`}
+        className="ml-1 flex h-4 w-4 shrink-0 items-center justify-center rounded opacity-0 group-hover:opacity-100 hover:bg-muted-foreground/20 transition-opacity"
+        onPointerDown={(e) => e.stopPropagation()}
+        onClick={(e) => {
+          e.stopPropagation();
+          onClose(tab.id);
+        }}
+      >
+        <X className="h-3 w-3" />
+      </button>
+    </div>
+  );
+}
+
+export function TabBar() {
+  const openTabs = useFileStore((s) => s.openTabs);
+  const activeTabId = useFileStore((s) => s.activeTabId);
+  const setActiveTab = useFileStore((s) => s.setActiveTab);
+  const closeTab = useFileStore((s) => s.closeTab);
+  const reorderTabs = useFileStore((s) => s.reorderTabs);
+
+  // Require a small drag distance before activating — so a click on the tab
+  // body still triggers `onClick` (dnd-kit's PointerSensor default is 0).
+  const sensors = useSensors(useSensor(PointerSensor, { activationConstraint: { distance: 6 } }));
+
+  if (openTabs.length === 0) {
+    return (
+      <div className="flex h-9 items-center border-b border-border bg-card/20 px-3 text-xs text-muted-foreground">
+        <span>No files open</span>
+      </div>
+    );
+  }
+
+  function handleDragEnd(e: DragEndEvent) {
+    const { active, over } = e;
+    if (!over || active.id === over.id) return;
+    const fromIndex = openTabs.findIndex((t) => t.id === active.id);
+    const toIndex = openTabs.findIndex((t) => t.id === over.id);
+    if (fromIndex === -1 || toIndex === -1) return;
+    reorderTabs(fromIndex, toIndex);
+  }
+
+  return (
+    <div className="flex h-9 items-center border-b border-border bg-card/20 overflow-x-auto">
+      <DndContext sensors={sensors} collisionDetection={closestCenter} onDragEnd={handleDragEnd}>
+        <SortableContext items={openTabs.map((t) => t.id)} strategy={horizontalListSortingStrategy}>
+          <div className="flex h-full items-center px-1">
+            {openTabs.map((tab) => (
+              <SortableTab
+                key={tab.id}
+                tab={tab}
+                isActive={tab.id === activeTabId}
+                onSelect={setActiveTab}
+                onClose={closeTab}
+              />
+            ))}
+          </div>
+        </SortableContext>
+      </DndContext>
+    </div>
+  );
+}
@@ -0,0 +1,77 @@
+import { Bold, Italic, List, ListOrdered, Code, Link as LinkIcon, PanelLeft, PanelRight, Save, FolderOpen, FileText } from 'lucide-react';
+import { Button } from '@/components/ui/button';
+import { useCommandStore } from '@/stores/command-store';
+import { useAppStore } from '@/stores/app-store';
+
+export function Toolbar() {
+  const dispatch = useCommandStore((s) => s.dispatch);
+  const { sidebarVisible, previewVisible } = useAppStore();
+
+  return (
+    <div
+      role="toolbar"
+      aria-label="Main toolbar"
+      className="flex h-10 items-center gap-1 border-b border-border bg-card/10 px-3"
+    >
+      <Button
+        variant="ghost"
+        size="icon"
+        aria-label="Open file"
+        data-testid="toolbar-open-file"
+        onClick={() => dispatch('file.open')}
+      >
+        <FileText className="h-4 w-4" />
+      </Button>
+      <Button
+        variant="ghost"
+        size="icon"
+        aria-label="Open folder"
+        data-testid="toolbar-open-folder"
+        onClick={() => dispatch('file.openFolder')}
+      >
+        <FolderOpen className="h-4 w-4" />
+      </Button>
+      <Button
+        variant="ghost"
+        size="icon"
+        aria-label="Save"
+        data-testid="toolbar-save"
+        onClick={() => dispatch('file.save')}
+      >
+        <Save className="h-4 w-4" />
+      </Button>
+
+      <div className="mx-1 h-5 w-px bg-border" aria-hidden="true" />
+
+      <Button
+        variant="ghost"
+        size="icon"
+        aria-label="Toggle sidebar"
+        aria-pressed={sidebarVisible}
+        data-testid="toolbar-toggle-sidebar"
+        onClick={() => dispatch('view.toggleSidebar')}
+      >
+        <PanelLeft className="h-4 w-4" />
+      </Button>
+      <Button
+        variant="ghost"
+        size="icon"
+        aria-label="Toggle preview"
+        aria-pressed={previewVisible}
+        data-testid="toolbar-toggle-preview"
+        onClick={() => dispatch('view.togglePreview')}
+      >
+        <PanelRight className="h-4 w-4" />
+      </Button>
+
+      <div className="mx-1 h-5 w-px bg-border" aria-hidden="true" />
+
+      <Button variant="ghost" size="icon" aria-label="Bold" disabled><Bold className="h-4 w-4" /></Button>
+      <Button variant="ghost" size="icon" aria-label="Italic" disabled><Italic className="h-4 w-4" /></Button>
+      <Button variant="ghost" size="icon" aria-label="Unordered list" disabled><List className="h-4 w-4" /></Button>
+      <Button variant="ghost" size="icon" aria-label="Ordered list" disabled><ListOrdered className="h-4 w-4" /></Button>
+      <Button variant="ghost" size="icon" aria-label="Code" disabled><Code className="h-4 w-4" /></Button>
+      <Button variant="ghost" size="icon" aria-label="Link" disabled><LinkIcon className="h-4 w-4" /></Button>
+    </div>
+  );
+}
@@ -0,0 +1,49 @@
+import { useEffect, useState } from 'react';
+import { Dialog, DialogContent, DialogDescription, DialogFooter, DialogHeader, DialogTitle } from '@/components/ui/dialog';
+import { Button } from '@/components/ui/button';
+import { ipc } from '@/lib/ipc';
+import { useAppStore } from '@/stores/app-store';
+
+export function AboutDialog() {
+  const closeModal = useAppStore((s) => s.closeModal);
+  const isOpen = useAppStore((s) => s.modal.kind) === 'about';
+  const [version, setVersion] = useState<string>('…');
+
+  useEffect(() => {
+    ipc.app.getVersion().then((r) => {
+      if (r.ok && typeof r.data === 'string') setVersion(r.data);
+    });
+  }, []);
+
+  return (
+    <Dialog open={isOpen} onOpenChange={(o) => !o && closeModal()}>
+      <DialogContent aria-describedby="about-desc">
+        <DialogHeader>
+          <DialogTitle>About MarkdownConverter</DialogTitle>
+          <DialogDescription id="about-desc">
+            Professional Markdown editor and universal file converter.
+          </DialogDescription>
+        </DialogHeader>
+        <div className="space-y-2 text-sm text-muted-foreground">
+          <p>Version: {version}</p>
+          <p>
+            <a
+              href="https://github.com/amitwh/markdown-converter"
+              className="text-brand hover:underline"
+              onClick={(e) => {
+                e.preventDefault();
+                ipc.app.openExternal('https://github.com/amitwh/markdown-converter');
+              }}
+            >
+              GitHub repository
+            </a>
+          </p>
+          <p className="text-xs">© ConcreteInfo. Licensed under MIT.</p>
+        </div>
+        <DialogFooter>
+          <Button onClick={closeModal}>Close</Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  );
+}
@@ -0,0 +1,38 @@
+import { useEffect, useState } from 'react';
+import { ipc } from '@/lib/ipc';
+
+export function AboutSettings() {
+  const [version, setVersion] = useState('…');
+
+  useEffect(() => {
+    ipc.app.getVersion().then((r) => {
+      if (r.ok && typeof r.data === 'string') setVersion(r.data);
+    });
+  }, []);
+
+  return (
+    <div className="space-y-3 text-sm">
+      <h3 className="text-base font-semibold">MarkdownConverter</h3>
+      <p className="text-muted-foreground">Version {version}</p>
+      <p>
+        <a
+          href="https://github.com/amitwh/markdown-converter"
+          className="text-brand hover:underline"
+          onClick={(e) => { e.preventDefault(); ipc.app.openExternal('https://github.com/amitwh/markdown-converter'); }}
+        >
+          GitHub repository
+        </a>
+      </p>
+      <p>
+        <a
+          href="https://concreteinfo.co.in"
+          className="text-brand hover:underline"
+          onClick={(e) => { e.preventDefault(); ipc.app.openExternal('https://concreteinfo.co.in'); }}
+        >
+          ConcreteInfo
+        </a>
+      </p>
+      <p className="text-xs text-muted-foreground">© ConcreteInfo. Licensed under MIT.</p>
+    </div>
+  );
+}
@@ -0,0 +1,36 @@
+import { Dialog, DialogContent, DialogDescription, DialogFooter, DialogHeader, DialogTitle } from '@/components/ui/dialog';
+import { Button } from '@/components/ui/button';
+import { useAppStore, type ConfirmProps } from '@/stores/app-store';
+
+export function ConfirmDialog(props: ConfirmProps) {
+  const closeModal = useAppStore((s) => s.closeModal);
+  const { title, body, confirmLabel = 'Confirm', cancelLabel = 'Cancel', destructive, onConfirm, onCancel } = props;
+
+  const handleConfirm = async () => {
+    await onConfirm();
+    closeModal();
+  };
+  const handleCancel = () => {
+    onCancel?.();
+    closeModal();
+  };
+
+  return (
+    <Dialog open onOpenChange={(o) => !o && handleCancel()}>
+      <DialogContent aria-describedby="confirm-body">
+        <DialogHeader>
+          <DialogTitle>{title}</DialogTitle>
+          <DialogDescription id="confirm-body">{body}</DialogDescription>
+        </DialogHeader>
+        <DialogFooter>
+          <Button variant="ghost" onClick={handleCancel}>
+            {cancelLabel}
+          </Button>
+          <Button variant={destructive ? 'destructive' : 'default'} onClick={handleConfirm}>
+            {confirmLabel}
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  );
+}
@@ -0,0 +1,41 @@
+import { useSettingsStore } from '@/stores/settings-store';
+import { Label } from '@/components/ui/label';
+import { Slider } from '@/components/ui/slider';
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';
+import { Switch } from '@/components/ui/switch';
+
+export function EditorSettings() {
+  const { fontSize, tabSize, lineNumbers, wordWrap, minimap, setSetting } = useSettingsStore();
+
+  return (
+    <div className="space-y-5 text-sm">
+      <div>
+        <Label htmlFor="editor-font-size">Font size: {fontSize}px</Label>
+        <Slider id="editor-font-size" min={10} max={24} step={1} value={[fontSize]} onValueChange={([v]) => setSetting('fontSize', v)} />
+      </div>
+      <div>
+        <Label htmlFor="editor-tab-size">Tab size</Label>
+        <Select value={String(tabSize)} onValueChange={(v) => setSetting('tabSize', Number(v) as 2 | 4 | 8)}>
+          <SelectTrigger id="editor-tab-size" aria-label="Tab size"><SelectValue /></SelectTrigger>
+          <SelectContent>
+            <SelectItem value="2">2 spaces</SelectItem>
+            <SelectItem value="4">4 spaces</SelectItem>
+            <SelectItem value="8">8 spaces</SelectItem>
+          </SelectContent>
+        </Select>
+      </div>
+      <label className="flex items-center justify-between">
+        <span>Line numbers</span>
+        <Switch checked={lineNumbers} onCheckedChange={(c) => setSetting('lineNumbers', c)} aria-label="Line numbers" />
+      </label>
+      <label className="flex items-center justify-between">
+        <span>Word wrap</span>
+        <Switch checked={wordWrap} onCheckedChange={(c) => setSetting('wordWrap', c)} aria-label="Word wrap" />
+      </label>
+      <label className="flex items-center justify-between">
+        <span>Minimap</span>
+        <Switch checked={minimap} onCheckedChange={(c) => setSetting('minimap', c)} aria-label="Minimap" />
+      </label>
+    </div>
+  );
+}
@@ -0,0 +1,82 @@
+import { useState } from 'react';
+import { Dialog, DialogContent, DialogDescription, DialogHeader, DialogTitle } from '@/components/ui/dialog';
+import { Label } from '@/components/ui/label';
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';
+import { useAppStore } from '@/stores/app-store';
+import { ipc } from '@/lib/ipc';
+import { toast } from '@/lib/toast';
+import { ExportDialogFooter } from './ExportDialogFooter';
+
+const extFor = (format: 'pdf' | 'docx' | 'html' | 'png') =>
+  format === 'pdf' ? '.pdf' : format === 'docx' ? '.docx' : format === 'png' ? '.png' : '.html';
+
+export function ExportBatchDialog({ sourcePaths }: { sourcePaths: string[] }) {
+  const closeModal = useAppStore((s) => s.closeModal);
+  const [format, setFormat] = useState<'pdf' | 'docx' | 'html' | 'png'>('pdf');
+  const [concurrency, setConcurrency] = useState(4);
+  const [submitting, setSubmitting] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  const handleSubmit = async () => {
+    setSubmitting(true);
+    setError(null);
+    const items = sourcePaths.map((p) => ({
+      inputPath: p,
+      outputPath: p.replace(/\.md$/, extFor(format)),
+    }));
+    const result = await ipc.export.batch(items, { format, concurrency });
+    if (!result.ok) {
+      toast.error(`Export failed: ${result.error.message}`);
+      setError(result.error.message);
+      setSubmitting(false);
+    } else {
+      toast.success(`Exported ${sourcePaths.length} files`);
+      closeModal();
+    }
+  };
+
+  return (
+    <Dialog open onOpenChange={(o) => !o && closeModal()}>
+      <DialogContent aria-describedby="batch-desc">
+        <DialogHeader>
+          <DialogTitle>Batch export</DialogTitle>
+          <DialogDescription id="batch-desc">{sourcePaths.length} files</DialogDescription>
+        </DialogHeader>
+        <div className="space-y-3 text-sm">
+          <div>
+            <Label htmlFor="batch-format">Format</Label>
+            <Select value={format} onValueChange={(v) => setFormat(v as any)}>
+              <SelectTrigger id="batch-format" aria-label="Format"><SelectValue /></SelectTrigger>
+              <SelectContent>
+                <SelectItem value="pdf">PDF</SelectItem>
+                <SelectItem value="docx">DOCX</SelectItem>
+                <SelectItem value="html">HTML</SelectItem>
+                <SelectItem value="png">PNG</SelectItem>
+              </SelectContent>
+            </Select>
+          </div>
+          <div>
+            <Label htmlFor="batch-concurrency">Concurrency</Label>
+            <Select value={String(concurrency)} onValueChange={(v) => setConcurrency(Number(v))}>
+              <SelectTrigger id="batch-concurrency" aria-label="Concurrency"><SelectValue /></SelectTrigger>
+              <SelectContent>
+                {[1, 2, 4, 8, 16].map((n) => (
+                  <SelectItem key={n} value={String(n)}>{n}</SelectItem>
+                ))}
+              </SelectContent>
+            </Select>
+          </div>
+          <div className="max-h-40 overflow-auto rounded border border-border bg-card/20 p-2 text-xs">
+            {sourcePaths.map((p) => <div key={p} className="truncate">{p}</div>)}
+          </div>
+          {error && (
+            <div role="alert" className="rounded border border-destructive/40 bg-destructive/5 p-2 text-xs text-destructive">
+              {error}
+            </div>
+          )}
+        </div>
+        <ExportDialogFooter onCancel={closeModal} onSubmit={handleSubmit} submitting={submitting} submitLabel="Export" />
+      </DialogContent>
+    </Dialog>
+  );
+}
@@ -0,0 +1,23 @@
+import { Button } from '@/components/ui/button';
+import { DialogFooter } from '@/components/ui/dialog';
+
+interface Props {
+  onCancel: () => void;
+  onSubmit: () => void;
+  submitting: boolean;
+  submitLabel: string;
+  submitDisabled?: boolean;
+}
+
+export function ExportDialogFooter({ onCancel, onSubmit, submitting, submitLabel, submitDisabled }: Props) {
+  return (
+    <DialogFooter>
+      <Button variant="ghost" onClick={onCancel} disabled={submitting}>
+        Cancel
+      </Button>
+      <Button onClick={onSubmit} disabled={submitting || submitDisabled}>
+        {submitting ? 'Exporting…' : submitLabel}
+      </Button>
+    </DialogFooter>
+  );
+}
@@ -0,0 +1,78 @@
+import { useState } from 'react';
+import { Dialog, DialogContent, DialogDescription, DialogHeader, DialogTitle } from '@/components/ui/dialog';
+import { Checkbox } from '@/components/ui/checkbox';
+import { Label } from '@/components/ui/label';
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';
+import { useAppStore } from '@/stores/app-store';
+import { useSettingsStore } from '@/stores/settings-store';
+import { useExportSource } from '@/hooks/use-export-source';
+import { ipc } from '@/lib/ipc';
+import { toast } from '@/lib/toast';
+import { ExportDialogFooter } from './ExportDialogFooter';
+
+export function ExportDocxDialog({ sourcePath }: { sourcePath: string }) {
+  const closeModal = useAppStore((s) => s.closeModal);
+  const { docxTemplate, renderTablesAsAscii } = useSettingsStore();
+  const source = useExportSource();
+  const [template, setTemplate] = useState<'standard' | 'minimal' | 'modern'>(docxTemplate);
+  const [ascii, setAscii] = useState(renderTablesAsAscii);
+  const [submitting, setSubmitting] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  const handleSubmit = async () => {
+    if (!source) { setError('No file open.'); return; }
+    setSubmitting(true);
+    setError(null);
+    const result = await ipc.export.docx({
+      inputPath: source.path,
+      outputPath: source.path.replace(/\.md$/, '.docx'),
+      template,
+      renderTablesAsAscii: ascii,
+    } as any);
+    if (!result.ok) {
+      toast.error(`Export failed: ${result.error.message}`);
+      setError(result.error.message);
+      setSubmitting(false);
+    } else {
+      toast.success(`Exported ${source.title} to ${result.data?.outputPath ?? 'file'}`);
+      closeModal();
+    }
+  };
+
+  return (
+    <Dialog open onOpenChange={(o) => !o && closeModal()}>
+      <DialogContent aria-describedby="docx-desc">
+        <DialogHeader>
+          <DialogTitle>Export to DOCX</DialogTitle>
+          <DialogDescription id="docx-desc">{sourcePath}</DialogDescription>
+        </DialogHeader>
+        <div className="space-y-3 text-sm">
+          <div>
+            <Label htmlFor="docx-template">Template</Label>
+            <Select value={template} onValueChange={(v) => setTemplate(v as any)}>
+              <SelectTrigger id="docx-template" aria-label="Template"><SelectValue /></SelectTrigger>
+              <SelectContent>
+                <SelectItem value="standard">Standard</SelectItem>
+                <SelectItem value="minimal">Minimal</SelectItem>
+                <SelectItem value="modern">Modern</SelectItem>
+              </SelectContent>
+            </Select>
+            <p className="mt-1 text-xs text-muted-foreground">
+              Bundled with the app. Standard is the default; Modern adds a colored cover page.
+            </p>
+          </div>
+          <label className="flex items-center gap-2">
+            <Checkbox checked={ascii} onCheckedChange={(c) => setAscii(!!c)} aria-label="ASCII tables" />
+            Render tables as ASCII
+          </label>
+          {error && (
+            <div role="alert" className="rounded border border-destructive/40 bg-destructive/5 p-2 text-xs text-destructive">
+              {error}
+            </div>
+          )}
+        </div>
+        <ExportDialogFooter onCancel={closeModal} onSubmit={handleSubmit} submitting={submitting} submitLabel="Export" />
+      </DialogContent>
+    </Dialog>
+  );
+}
@@ -0,0 +1,82 @@
+import { useState } from 'react';
+import { Dialog, DialogContent, DialogDescription, DialogHeader, DialogTitle } from '@/components/ui/dialog';
+import { Checkbox } from '@/components/ui/checkbox';
+import { Label } from '@/components/ui/label';
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';
+import { useAppStore } from '@/stores/app-store';
+import { useSettingsStore } from '@/stores/settings-store';
+import { useExportSource } from '@/hooks/use-export-source';
+import { ipc } from '@/lib/ipc';
+import { toast } from '@/lib/toast';
+import { ExportDialogFooter } from './ExportDialogFooter';
+
+export function ExportHtmlDialog({ sourcePath }: { sourcePath: string }) {
+  const closeModal = useAppStore((s) => s.closeModal);
+  const { htmlHighlightStyle, renderTablesAsAscii } = useSettingsStore();
+  const source = useExportSource();
+  const [standalone, setStandalone] = useState(true);
+  const [highlight, setHighlight] = useState(htmlHighlightStyle);
+  const [ascii, setAscii] = useState(renderTablesAsAscii);
+  const [submitting, setSubmitting] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  const handleSubmit = async () => {
+    if (!source) { setError('No file open.'); return; }
+    setSubmitting(true);
+    setError(null);
+    const result = await ipc.export.html({
+      inputPath: source.path,
+      outputPath: source.path.replace(/\.md$/, '.html'),
+      standalone,
+      highlightStyle: highlight,
+      renderTablesAsAscii: ascii,
+    } as any);
+    if (!result.ok) {
+      toast.error(`Export failed: ${result.error.message}`);
+      setError(result.error.message);
+      setSubmitting(false);
+    } else {
+      toast.success(`Exported ${source.title} to ${result.data?.outputPath ?? 'file'}`);
+      closeModal();
+    }
+  };
+
+  return (
+    <Dialog open onOpenChange={(o) => !o && closeModal()}>
+      <DialogContent aria-describedby="html-desc">
+        <DialogHeader>
+          <DialogTitle>Export to HTML</DialogTitle>
+          <DialogDescription id="html-desc">{sourcePath}</DialogDescription>
+        </DialogHeader>
+        <div className="space-y-3 text-sm">
+          <label className="flex items-center gap-2">
+            <Checkbox checked={standalone} onCheckedChange={(c) => setStandalone(!!c)} aria-label="Standalone" />
+            Standalone document (with inline CSS)
+          </label>
+          <div>
+            <Label htmlFor="html-highlight">Syntax highlight style</Label>
+            <Select value={highlight} onValueChange={(v) => setHighlight(v as any)}>
+              <SelectTrigger id="html-highlight" aria-label="Highlight style"><SelectValue /></SelectTrigger>
+              <SelectContent>
+                <SelectItem value="github">GitHub</SelectItem>
+                <SelectItem value="monokai">Monokai</SelectItem>
+                <SelectItem value="nord">Nord</SelectItem>
+                <SelectItem value="none">None</SelectItem>
+              </SelectContent>
+            </Select>
+          </div>
+          <label className="flex items-center gap-2">
+            <Checkbox checked={ascii} onCheckedChange={(c) => setAscii(!!c)} aria-label="ASCII tables" />
+            Render tables as ASCII
+          </label>
+          {error && (
+            <div role="alert" className="rounded border border-destructive/40 bg-destructive/5 p-2 text-xs text-destructive">
+              {error}
+            </div>
+          )}
+        </div>
+        <ExportDialogFooter onCancel={closeModal} onSubmit={handleSubmit} submitting={submitting} submitLabel="Export" />
+      </DialogContent>
+    </Dialog>
+  );
+}
@@ -0,0 +1,105 @@
+import { useState } from 'react';
+import { Dialog, DialogContent, DialogDescription, DialogHeader, DialogTitle } from '@/components/ui/dialog';
+import { Checkbox } from '@/components/ui/checkbox';
+import { Label } from '@/components/ui/label';
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';
+import { useAppStore } from '@/stores/app-store';
+import { useSettingsStore } from '@/stores/settings-store';
+import { useExportSource } from '@/hooks/use-export-source';
+import { ipc } from '@/lib/ipc';
+import { toast } from '@/lib/toast';
+import { ExportDialogFooter } from './ExportDialogFooter';
+
+const MARGIN_MAP = {
+  normal: { top: 25, right: 25, bottom: 25, left: 25 },
+  narrow: { top: 15, right: 15, bottom: 15, left: 15 },
+  wide: { top: 35, right: 35, bottom: 35, left: 35 },
+} as const;
+
+export function ExportPdfDialog({ sourcePath }: { sourcePath: string }) {
+  const closeModal = useAppStore((s) => s.closeModal);
+  const { fontSize, pdfFormat, pdfMargins, pdfEmbedFonts, renderTablesAsAscii } = useSettingsStore();
+  const [format, setFormat] = useState<'letter' | 'a4' | 'legal'>(pdfFormat);
+  const [margins, setMargins] = useState<'normal' | 'narrow' | 'wide'>(pdfMargins);
+  const [embed, setEmbed] = useState(pdfEmbedFonts);
+  const [ascii, setAscii] = useState(renderTablesAsAscii);
+  const [submitting, setSubmitting] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  const source = useExportSource();
+
+  const handleSubmit = async () => {
+    if (!source) {
+      setError('No file open.');
+      return;
+    }
+    setSubmitting(true);
+    setError(null);
+    const result = await ipc.export.pdf({
+      inputPath: source.path,
+      outputPath: source.path.replace(/\.md$/, '.pdf'),
+      format,
+      margins: MARGIN_MAP[margins],
+      embedFonts: embed,
+      renderTablesAsAscii: ascii,
+      fontSize,
+    } as any);
+    if (!result.ok) {
+      toast.error(`Export failed: ${result.error?.message ?? 'Export failed'}`);
+      setError(result.error?.message ?? 'Export failed');
+      setSubmitting(false);
+    } else {
+      toast.success(`Exported ${source.title} to ${result.data?.outputPath ?? 'file'}`);
+      closeModal();
+    }
+  };
+
+  return (
+    <Dialog open onOpenChange={(o) => !o && closeModal()}>
+      <DialogContent aria-describedby="pdf-desc">
+        <DialogHeader>
+          <DialogTitle>Export to PDF</DialogTitle>
+          <DialogDescription id="pdf-desc">{sourcePath}</DialogDescription>
+        </DialogHeader>
+        <div className="space-y-3 text-sm">
+          <div>
+            <Label htmlFor="pdf-format">Format</Label>
+            <Select value={format} onValueChange={(v) => setFormat(v as typeof format)}>
+              <SelectTrigger id="pdf-format" aria-label="Format"><SelectValue /></SelectTrigger>
+              <SelectContent>
+                <SelectItem value="letter">Letter</SelectItem>
+                <SelectItem value="a4">A4</SelectItem>
+                <SelectItem value="legal">Legal</SelectItem>
+              </SelectContent>
+            </Select>
+          </div>
+          <div>
+            <Label htmlFor="pdf-margins">Margins</Label>
+            <Select value={margins} onValueChange={(v) => setMargins(v as typeof margins)}>
+              <SelectTrigger id="pdf-margins" aria-label="Margins"><SelectValue /></SelectTrigger>
+              <SelectContent>
+                <SelectItem value="narrow">Narrow</SelectItem>
+                <SelectItem value="normal">Normal</SelectItem>
+                <SelectItem value="wide">Wide</SelectItem>
+              </SelectContent>
+            </Select>
+          </div>
+          <label className="flex items-center gap-2">
+            <Checkbox checked={embed} onCheckedChange={(c) => setEmbed(!!c)} aria-label="Embed fonts" />
+            Embed fonts
+          </label>
+          <label className="flex items-center gap-2">
+            <Checkbox checked={ascii} onCheckedChange={(c) => setAscii(!!c)} aria-label="ASCII tables" />
+            Render tables as ASCII
+          </label>
+          {error && (
+            <div role="alert" className="rounded border border-destructive/40 bg-destructive/5 p-2 text-xs text-destructive">
+              {error}
+            </div>
+          )}
+        </div>
+        <ExportDialogFooter onCancel={closeModal} onSubmit={handleSubmit} submitting={submitting} submitLabel="Export" />
+      </DialogContent>
+    </Dialog>
+  );
+}
@@ -0,0 +1,66 @@
+import { useSettingsStore } from '@/stores/settings-store';
+import { Label } from '@/components/ui/label';
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';
+import { Switch } from '@/components/ui/switch';
+
+export function ExportSettings() {
+  const { pdfFormat, pdfMargins, pdfEmbedFonts, docxTemplate, htmlHighlightStyle, renderTablesAsAscii, setSetting } = useSettingsStore();
+
+  return (
+    <div className="space-y-5 text-sm">
+      <div>
+        <Label htmlFor="export-pdf-format">Default PDF format</Label>
+        <Select value={pdfFormat} onValueChange={(v) => setSetting('pdfFormat', v as any)}>
+          <SelectTrigger id="export-pdf-format" aria-label="Default PDF format"><SelectValue /></SelectTrigger>
+          <SelectContent>
+            <SelectItem value="letter">Letter</SelectItem>
+            <SelectItem value="a4">A4</SelectItem>
+            <SelectItem value="legal">Legal</SelectItem>
+          </SelectContent>
+        </Select>
+      </div>
+      <div>
+        <Label htmlFor="export-pdf-margins">Default PDF margins</Label>
+        <Select value={pdfMargins} onValueChange={(v) => setSetting('pdfMargins', v as any)}>
+          <SelectTrigger id="export-pdf-margins" aria-label="Default PDF margins"><SelectValue /></SelectTrigger>
+          <SelectContent>
+            <SelectItem value="narrow">Narrow</SelectItem>
+            <SelectItem value="normal">Normal</SelectItem>
+            <SelectItem value="wide">Wide</SelectItem>
+          </SelectContent>
+        </Select>
+      </div>
+      <label className="flex items-center justify-between">
+        <span>Embed fonts in PDFs</span>
+        <Switch checked={pdfEmbedFonts} onCheckedChange={(c) => setSetting('pdfEmbedFonts', c)} aria-label="Embed fonts" />
+      </label>
+      <div>
+        <Label htmlFor="export-docx-template">Default DOCX template</Label>
+        <Select value={docxTemplate} onValueChange={(v) => setSetting('docxTemplate', v as any)}>
+          <SelectTrigger id="export-docx-template" aria-label="Default DOCX template"><SelectValue /></SelectTrigger>
+          <SelectContent>
+            <SelectItem value="standard">Standard</SelectItem>
+            <SelectItem value="minimal">Minimal</SelectItem>
+            <SelectItem value="modern">Modern</SelectItem>
+          </SelectContent>
+        </Select>
+      </div>
+      <div>
+        <Label htmlFor="export-html-highlight">Default HTML highlight</Label>
+        <Select value={htmlHighlightStyle} onValueChange={(v) => setSetting('htmlHighlightStyle', v as any)}>
+          <SelectTrigger id="export-html-highlight" aria-label="Default HTML highlight"><SelectValue /></SelectTrigger>
+          <SelectContent>
+            <SelectItem value="github">GitHub</SelectItem>
+            <SelectItem value="monokai">Monokai</SelectItem>
+            <SelectItem value="nord">Nord</SelectItem>
+            <SelectItem value="none">None</SelectItem>
+          </SelectContent>
+        </Select>
+      </div>
+      <label className="flex items-center justify-between">
+        <span>Render tables as ASCII by default</span>
+        <Switch checked={renderTablesAsAscii} onCheckedChange={(c) => setSetting('renderTablesAsAscii', c)} aria-label="ASCII tables by default" />
+      </label>
+    </div>
+  );
+}
@@ -0,0 +1,33 @@
+import { useAppStore } from '@/stores/app-store';
+import { AboutDialog } from './AboutDialog';
+import { ConfirmDialog } from './ConfirmDialog';
+import { ExportBatchDialog } from './ExportBatchDialog';
+import { ExportDocxDialog } from './ExportDocxDialog';
+import { ExportHtmlDialog } from './ExportHtmlDialog';
+import { ExportPdfDialog } from './ExportPdfDialog';
+import { SettingsSheet } from './SettingsSheet';
+import { WelcomeDialog } from './WelcomeDialog';
+
+export function ModalLayer() {
+  const modal = useAppStore((s) => s.modal);
+  switch (modal.kind) {
+    case null:
+      return null;
+    case 'export-pdf':
+      return <ExportPdfDialog sourcePath={modal.props.sourcePath} />;
+    case 'export-docx':
+      return <ExportDocxDialog sourcePath={modal.props.sourcePath} />;
+    case 'export-html':
+      return <ExportHtmlDialog sourcePath={modal.props.sourcePath} />;
+    case 'export-batch':
+      return <ExportBatchDialog sourcePaths={modal.props.sourcePaths} />;
+    case 'settings':
+      return <SettingsSheet />;
+    case 'about':
+      return <AboutDialog />;
+    case 'welcome':
+      return <WelcomeDialog />;
+    case 'confirm':
+      return <ConfirmDialog {...modal.props} />;
+  }
+}
@@ -0,0 +1,14 @@
+import { Sparkles } from 'lucide-react';
+
+export function PluginsSettings() {
+  return (
+    <div className="flex flex-col items-center justify-center gap-3 py-12 text-center text-muted-foreground">
+      <Sparkles className="h-8 w-8 opacity-50" />
+      <h3 className="text-base font-semibold text-foreground">Coming soon</h3>
+      <p className="max-w-sm text-sm">
+        The plugin system is on the roadmap. You'll be able to extend MarkdownConverter with custom
+        commands, themes, and export formats.
+      </p>
+    </div>
+  );
+}
@@ -0,0 +1,45 @@
+import { Sheet, SheetContent, SheetDescription, SheetHeader, SheetTitle } from '@/components/ui/sheet';
+import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs';
+import { Button } from '@/components/ui/button';
+import { useAppStore } from '@/stores/app-store';
+import { useSettingsStore } from '@/stores/settings-store';
+import { EditorSettings } from './EditorSettings';
+import { ThemeSettings } from './ThemeSettings';
+import { ExportSettings } from './ExportSettings';
+import { PluginsSettings } from './PluginsSettings';
+import { AboutSettings } from './AboutSettings';
+
+export function SettingsSheet() {
+  const closeModal = useAppStore((s) => s.closeModal);
+  const resetToDefaults = useSettingsStore((s) => s.resetToDefaults);
+
+  return (
+    <Sheet open onOpenChange={(o) => !o && closeModal()}>
+      <SheetContent aria-describedby="settings-desc" side="right" className="w-full sm:max-w-[480px]">
+        <SheetHeader>
+          <SheetTitle>Settings</SheetTitle>
+          <SheetDescription id="settings-desc">Editor, theme, and export preferences</SheetDescription>
+        </SheetHeader>
+        <Tabs defaultValue="editor" className="mt-4">
+          <TabsList className="grid w-full grid-cols-5">
+            <TabsTrigger value="editor">Editor</TabsTrigger>
+            <TabsTrigger value="theme">Theme</TabsTrigger>
+            <TabsTrigger value="export">Export</TabsTrigger>
+            <TabsTrigger value="plugins">Plugins</TabsTrigger>
+            <TabsTrigger value="about">About</TabsTrigger>
+          </TabsList>
+          <div className="mt-4 max-h-[70vh] overflow-y-auto pr-2">
+            <TabsContent value="editor"><EditorSettings /></TabsContent>
+            <TabsContent value="theme"><ThemeSettings /></TabsContent>
+            <TabsContent value="export"><ExportSettings /></TabsContent>
+            <TabsContent value="plugins"><PluginsSettings /></TabsContent>
+            <TabsContent value="about"><AboutSettings /></TabsContent>
+          </div>
+        </Tabs>
+        <div className="mt-4 flex justify-end border-t border-border pt-4">
+          <Button variant="ghost" onClick={resetToDefaults}>Reset to defaults</Button>
+        </div>
+      </SheetContent>
+    </Sheet>
+  );
+}
@@ -0,0 +1,45 @@
+import { useSettingsStore } from '@/stores/settings-store';
+import { Label } from '@/components/ui/label';
+import { RadioGroup, RadioGroupItem } from '@/components/ui/radio-group';
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';
+
+export function ThemeSettings() {
+  const { theme, accentColor, fontFamily, setSetting } = useSettingsStore();
+
+  return (
+    <div className="space-y-5 text-sm">
+      <div>
+        <Label>Mode</Label>
+        <RadioGroup value={theme} onValueChange={(v) => setSetting('theme', v as 'light' | 'dark' | 'auto')}>
+          <div className="flex items-center gap-2"><RadioGroupItem value="light" id="theme-light" /><Label htmlFor="theme-light">Light</Label></div>
+          <div className="flex items-center gap-2"><RadioGroupItem value="dark" id="theme-dark" /><Label htmlFor="theme-dark">Dark</Label></div>
+          <div className="flex items-center gap-2"><RadioGroupItem value="auto" id="theme-auto" /><Label htmlFor="theme-auto">Auto (system)</Label></div>
+        </RadioGroup>
+      </div>
+      <div>
+        <Label htmlFor="theme-accent">Accent color</Label>
+        <Select value={accentColor} onValueChange={(v) => setSetting('accentColor', v as any)}>
+          <SelectTrigger id="theme-accent" aria-label="Accent color"><SelectValue /></SelectTrigger>
+          <SelectContent>
+            <SelectItem value="brand">Brand (orange)</SelectItem>
+            <SelectItem value="blue">Blue</SelectItem>
+            <SelectItem value="green">Green</SelectItem>
+            <SelectItem value="purple">Purple</SelectItem>
+            <SelectItem value="orange">Orange</SelectItem>
+          </SelectContent>
+        </Select>
+      </div>
+      <div>
+        <Label htmlFor="theme-font-family">Editor font</Label>
+        <Select value={fontFamily} onValueChange={(v) => setSetting('fontFamily', v as any)}>
+          <SelectTrigger id="theme-font-family" aria-label="Editor font"><SelectValue /></SelectTrigger>
+          <SelectContent>
+            <SelectItem value="system">System (Plus Jakarta Sans)</SelectItem>
+            <SelectItem value="jetbrains">JetBrains Mono</SelectItem>
+            <SelectItem value="fira">Fira Code</SelectItem>
+          </SelectContent>
+        </Select>
+      </div>
+    </div>
+  );
+}
@@ -0,0 +1,51 @@
+import { useState } from 'react';
+import { Dialog, DialogContent, DialogDescription, DialogFooter, DialogHeader, DialogTitle } from '@/components/ui/dialog';
+import { Button } from '@/components/ui/button';
+import { Checkbox } from '@/components/ui/checkbox';
+import { useAppStore } from '@/stores/app-store';
+import { useSettingsStore } from '@/stores/settings-store';
+
+export function WelcomeDialog() {
+  const closeModal = useAppStore((s) => s.closeModal);
+  const setSetting = useSettingsStore((s) => s.setSetting);
+  const [dontShow, setDontShow] = useState(false);
+
+  const handleClose = () => {
+    if (dontShow) setSetting('welcomeDismissed', true);
+    closeModal();
+  };
+
+  return (
+    <Dialog open onOpenChange={(o) => !o && handleClose()}>
+      <DialogContent aria-describedby="welcome-desc" className="max-w-xl">
+        <DialogHeader>
+          <DialogTitle>Welcome to MarkdownConverter</DialogTitle>
+          <DialogDescription id="welcome-desc">
+            A polished editor for Markdown, with PDF, DOCX, and HTML export.
+          </DialogDescription>
+        </DialogHeader>
+        <div className="space-y-3 text-sm">
+          <div className="rounded-md border border-border bg-card/30 p-3">
+            <h3 className="font-semibold">1. Open a folder</h3>
+            <p className="text-muted-foreground">File → Open Folder, or ⌘O. Your tree appears on the left.</p>
+          </div>
+          <div className="rounded-md border border-border bg-card/30 p-3">
+            <h3 className="font-semibold">2. Edit & preview</h3>
+            <p className="text-muted-foreground">Type on the left, see the rendered preview on the right. Toggle with ⌘\.</p>
+          </div>
+          <div className="rounded-md border border-border bg-card/30 p-3">
+            <h3 className="font-semibold">3. Export anywhere</h3>
+            <p className="text-muted-foreground">File → Export to PDF / DOCX / HTML, or batch convert a folder.</p>
+          </div>
+        </div>
+        <DialogFooter className="flex-row items-center justify-between sm:justify-between">
+          <label className="flex items-center gap-2 text-xs text-muted-foreground">
+            <Checkbox checked={dontShow} onCheckedChange={(c) => setDontShow(!!c)} aria-label="Don't show again" />
+            Don't show again
+          </label>
+          <Button onClick={handleClose}>Get started</Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  );
+}
@@ -0,0 +1,44 @@
+import { useEffect, useRef, useState } from 'react';
+import { renderMarkdown } from '@/lib/markdown';
+import { MermaidLazy } from './MermaidLazy';
+
+interface Props {
+  source: string;
+}
+
+const MERMAID_RE = /```mermaid\n([\s\S]*?)```/g;
+
+function extractMermaidCodes(source: string): string[] {
+  const codes: string[] = [];
+  let match: RegExpExecArray | null;
+  while ((match = MERMAID_RE.exec(source)) !== null) {
+    codes.push(match[1].trim());
+  }
+  return codes;
+}
+
+export function MarkdownRenderer({ source }: Props) {
+  const html = renderMarkdown(source);
+  const containerRef = useRef<HTMLDivElement>(null);
+  const [mermaidCodes, setMermaidCodes] = useState<string[]>([]);
+
+  // Re-derive mermaid codes from the original source. The renderMarkdown function
+  // replaces mermaid blocks with placeholders (data-mermaid-source="${idx}"), but
+  // it does not return the actual codes. Rather than thread them through the API,
+  // we re-extract from the source. Source is small (single buffer content) so this
+  // cost is negligible.
+  useEffect(() => {
+    setMermaidCodes(extractMermaidCodes(source));
+  }, [source]);
+
+  return (
+    <div className="prose prose-neutral dark:prose-invert max-w-none p-6" ref={containerRef}>
+      <div dangerouslySetInnerHTML={{ __html: html }} />
+      {mermaidCodes.map((code, i) => (
+        <div key={i} className="my-4">
+          <MermaidLazy code={code} />
+        </div>
+      ))}
+    </div>
+  );
+}
@@ -0,0 +1,45 @@
+import { useEffect, useRef, useState } from 'react';
+
+interface Props {
+  code: string;
+}
+
+let mermaidModule: typeof import('mermaid').default | null = null;
+let initialized = false;
+
+async function getMermaid() {
+  if (!mermaidModule) {
+    const mod = await import('mermaid');
+    mermaidModule = mod.default;
+  }
+  if (!initialized) {
+    mermaidModule.initialize({ startOnLoad: false, theme: 'default' });
+    initialized = true;
+  }
+  return mermaidModule;
+}
+
+export function MermaidLazy({ code }: Props) {
+  const [svg, setSvg] = useState<string | null>(null);
+  const [error, setError] = useState<string | null>(null);
+  const idRef = useRef(`mermaid-${Math.random().toString(36).slice(2)}`);
+
+  useEffect(() => {
+    let cancelled = false;
+    getMermaid()
+      .then((m) => m.render(idRef.current, code))
+      .then((rendered) => {
+        if (!cancelled) setSvg(rendered);
+      })
+      .catch((err: Error) => {
+        if (!cancelled) setError(err.message);
+      });
+    return () => {
+      cancelled = true;
+    };
+  }, [code]);
+
+  if (error) return <div className="rounded border border-destructive/40 bg-destructive/5 p-2 text-xs text-destructive">{error}</div>;
+  if (!svg) return <div className="text-xs text-muted-foreground">Loading diagram…</div>;
+  return <div data-testid="mermaid-output" dangerouslySetInnerHTML={{ __html: svg }} />;
+}
@@ -0,0 +1,22 @@
+import { MarkdownRenderer } from './MarkdownRenderer';
+import { usePreviewStore } from '@/stores/preview-store';
+import { useScrollSync } from '@/hooks/use-scroll-sync';
+
+export function PreviewPane() {
+  const { source, setScrollRatio } = usePreviewStore();
+  const { handlePreviewScroll } = useScrollSync({ onPreviewScroll: setScrollRatio });
+
+  if (!source) {
+    return (
+      <div className="flex h-full items-center justify-center text-muted-foreground">
+        <p>Nothing to preview. Start typing in the editor.</p>
+      </div>
+    );
+  }
+
+  return (
+    <div className="h-full overflow-auto bg-card/10" onScroll={handlePreviewScroll}>
+      <MarkdownRenderer source={source} />
+    </div>
+  );
+}
@@ -0,0 +1,73 @@
+import { ChevronRight, Folder, FolderOpen, File, FileText } from 'lucide-react';
+import { useFileStore } from '@/stores/file-store';
+import { cn } from '@/lib/utils';
+
+function FileTreeNode({ node, depth }: { node: import('@/stores/file-store').FileNode; depth: number }) {
+  const { expanded, activeTabId, loadChildren, toggleExpanded, openFile } = useFileStore();
+  const isExpanded = expanded.has(node.path);
+  const isActive = activeTabId === node.path;
+
+  if (node.isDirectory) {
+    const handleClick = async () => {
+      if (!node.loaded) {
+        await loadChildren(node.path);
+      }
+      toggleExpanded(node.path);
+    };
+
+    return (
+      <div>
+        <button
+          onClick={handleClick}
+          className={cn(
+            'flex w-full items-center gap-1 rounded px-1 py-0.5 text-left text-xs hover:bg-accent',
+            isActive && 'bg-accent'
+          )}
+          style={{ paddingLeft: `${depth * 16 + 4}px` }}
+        >
+          <ChevronRight
+            size={12}
+            className={cn('transition-transform duration-150', isExpanded && 'rotate-90')}
+          />
+          {isExpanded ? <FolderOpen size={14} /> : <Folder size={14} />}
+          <span className="truncate">{node.name}</span>
+        </button>
+        {isExpanded && node.loaded && node.children && (
+          <div>
+            {node.children.map((child) => (
+              <FileTreeNode key={child.path} node={child} depth={depth + 1} />
+            ))}
+          </div>
+        )}
+      </div>
+    );
+  }
+
+  return (
+    <button
+      onClick={() => openFile(node.path)}
+      className={cn(
+        'flex w-full items-center gap-1 rounded px-1 py-0.5 text-left text-xs hover:bg-accent',
+        isActive && 'bg-accent text-accent-foreground'
+      )}
+      style={{ paddingLeft: `${depth * 16 + 4}px` }}
+    >
+      <FileText size={14} />
+      <span className="truncate">{node.name}</span>
+    </button>
+  );
+}
+
+export function FileTree() {
+  const tree = useFileStore((s) => s.tree);
+
+  if (!tree) return null;
+
+  return (
+    <div className="py-1">
+      {tree.children?.map((child) => (
+        <FileTreeNode key={child.path} node={child} depth={0} />
+      ))}
+    </div>
+  );
+}
@@ -0,0 +1,77 @@
+import { useEditorStore } from '@/stores/editor-store';
+
+const HEADING_RE = /^(#{1,6})\s+(.+)$/gm;
+
+interface HeadingItem {
+  level: number;
+  text: string;
+  line: number;
+}
+
+function extractHeadings(content: string): HeadingItem[] {
+  const headings: HeadingItem[] = [];
+  let match: RegExpExecArray | null;
+  const re = new RegExp(HEADING_RE.source, 'gm');
+  let lineNum = 1;
+  for (const line of content.split('\n')) {
+    re.lastIndex = 0;
+    match = re.exec(line);
+    if (match) {
+      headings.push({
+        level: match[1].length,
+        text: match[2].trim(),
+        line: lineNum,
+      });
+    }
+    lineNum++;
+  }
+  return headings;
+}
+
+export function Outline() {
+  const activeId = useEditorStore((s) => s.activeId);
+  const buffers = useEditorStore((s) => s.buffers);
+
+  if (!activeId) {
+    return (
+      <div className="flex flex-col items-center justify-center gap-2 py-8 text-xs text-muted-foreground">
+        <span>No file open</span>
+      </div>
+    );
+  }
+
+  const buffer = buffers.get(activeId);
+  if (!buffer) {
+    return (
+      <div className="flex flex-col items-center justify-center gap-2 py-8 text-xs text-muted-foreground">
+        <span>No file open</span>
+      </div>
+    );
+  }
+
+  const headings = extractHeadings(buffer.content);
+
+  if (headings.length === 0) {
+    return (
+      <div className="flex flex-col items-center justify-center gap-2 py-8 text-xs text-muted-foreground">
+        <span>No headings</span>
+      </div>
+    );
+  }
+
+  return (
+    <div className="flex flex-col gap-0.5 py-1">
+      {headings.map((h, i) => (
+        <button
+          key={i}
+          onClick={() => {}}
+          className="flex items-center gap-1 rounded px-2 py-0.5 text-left text-xs hover:bg-accent"
+          style={{ paddingLeft: `${(h.level - 1) * 16 + 8}px` }}
+        >
+          <span className="truncate text-muted-foreground">#{h.level}</span>
+          <span className="truncate">{h.text}</span>
+        </button>
+      ))}
+    </div>
+  );
+}
@@ -0,0 +1,54 @@
+import { ChevronRight, FolderOpen } from 'lucide-react';
+import { Button } from '@/components/ui/button';
+import { Collapsible, CollapsibleTrigger, CollapsibleContent } from '@/components/ui/collapsible';
+import { ScrollArea } from '@/components/ui/scroll-area';
+import { useFileStore } from '@/stores/file-store';
+import { FileTree } from './FileTree';
+import { Outline } from './Outline';
+
+export function Sidebar() {
+  const tree = useFileStore((s) => s.tree);
+
+  return (
+    <div className="flex h-full flex-col gap-3">
+      {/* Files section */}
+      <Collapsible defaultOpen>
+        <CollapsibleTrigger asChild>
+          <button className="flex w-full items-center gap-1.5 px-1 py-1.5 text-xs font-medium hover:bg-accent rounded">
+            <ChevronRight size={12} className="rotate-90" />
+            Files
+          </button>
+        </CollapsibleTrigger>
+        <CollapsibleContent>
+          <ScrollArea className="h-[calc(100vh-240px)]">
+            {!tree ? (
+              <div className="flex flex-col items-center gap-2 p-4 text-xs text-muted-foreground">
+                <span>No folder opened</span>
+                <Button size="sm" variant="outline" onClick={() => useFileStore.getState().openFolderDialog()}>
+                  <FolderOpen className="mr-1" /> Open Folder
+                </Button>
+              </div>
+            ) : (
+              <FileTree />
+            )}
+          </ScrollArea>
+        </CollapsibleContent>
+      </Collapsible>
+
+      {/* Outline section */}
+      <Collapsible defaultOpen>
+        <CollapsibleTrigger asChild>
+          <button className="flex w-full items-center gap-1.5 px-1 py-1.5 text-xs font-medium hover:bg-accent rounded">
+            <ChevronRight size={12} className="rotate-90" />
+            Outline
+          </button>
+        </CollapsibleTrigger>
+        <CollapsibleContent>
+          <ScrollArea className="h-[calc(100vh-240px)]">
+            <Outline />
+          </ScrollArea>
+        </CollapsibleContent>
+      </Collapsible>
+    </div>
+  );
+}
@@ -0,0 +1,27 @@
+import * as React from "react"
+import * as CheckboxPrimitive from "@radix-ui/react-checkbox"
+import { Check } from "lucide-react"
+import { cn } from "@/lib/utils"
+
+const Checkbox = React.forwardRef<
+  React.ElementRef<typeof CheckboxPrimitive.Root>,
+  React.ComponentPropsWithoutRef<typeof CheckboxPrimitive.Root>
+>(({ className, ...props }, ref) => (
+  <CheckboxPrimitive.Root
+    ref={ref}
+    className={cn(
+      "peer h-4 w-4 shrink-0 rounded-sm border border-primary ring-offset-background focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50 data-[state=checked]:bg-primary data-[state=checked]:text-primary-foreground",
+      className
+    )}
+    {...props}
+  >
+    <CheckboxPrimitive.Indicator
+      className={cn("flex items-center justify-center text-current")}
+    >
+      <Check className="h-4 w-4" />
+    </CheckboxPrimitive.Indicator>
+  </CheckboxPrimitive.Root>
+))
+Checkbox.displayName = CheckboxPrimitive.Root.displayName
+
+export { Checkbox }
@@ -0,0 +1,11 @@
+"use client"
+
+import * as CollapsiblePrimitive from "@radix-ui/react-collapsible"
+
+const Collapsible = CollapsiblePrimitive.Root
+
+const CollapsibleTrigger = CollapsiblePrimitive.CollapsibleTrigger
+
+const CollapsibleContent = CollapsiblePrimitive.CollapsibleContent
+
+export { Collapsible, CollapsibleTrigger, CollapsibleContent }
@@ -0,0 +1,200 @@
+"use client"
+
+import * as React from "react"
+import * as ContextMenuPrimitive from "@radix-ui/react-context-menu"
+import { Check, ChevronRight, Circle } from "lucide-react"
+
+import { cn } from "@/lib/utils"
+
+const ContextMenu = ContextMenuPrimitive.Root
+
+const ContextMenuTrigger = ContextMenuPrimitive.Trigger
+
+const ContextMenuGroup = ContextMenuPrimitive.Group
+
+const ContextMenuPortal = ContextMenuPrimitive.Portal
+
+const ContextMenuSub = ContextMenuPrimitive.Sub
+
+const ContextMenuRadioGroup = ContextMenuPrimitive.RadioGroup
+
+const ContextMenuSubTrigger = React.forwardRef<
+  React.ElementRef<typeof ContextMenuPrimitive.SubTrigger>,
+  React.ComponentPropsWithoutRef<typeof ContextMenuPrimitive.SubTrigger> & {
+    inset?: boolean
+  }
+>(({ className, inset, children, ...props }, ref) => (
+  <ContextMenuPrimitive.SubTrigger
+    ref={ref}
+    className={cn(
+      "flex cursor-default select-none items-center rounded-sm px-2 py-1.5 text-sm outline-none focus:bg-accent focus:text-accent-foreground data-[state=open]:bg-accent data-[state=open]:text-accent-foreground",
+      inset && "pl-8",
+      className
+    )}
+    {...props}
+  >
+    {children}
+    <ChevronRight className="ml-auto h-4 w-4" />
+  </ContextMenuPrimitive.SubTrigger>
+))
+ContextMenuSubTrigger.displayName = ContextMenuPrimitive.SubTrigger.displayName
+
+const ContextMenuSubContent = React.forwardRef<
+  React.ElementRef<typeof ContextMenuPrimitive.SubContent>,
+  React.ComponentPropsWithoutRef<typeof ContextMenuPrimitive.SubContent>
+>(({ className, ...props }, ref) => (
+  <ContextMenuPrimitive.SubContent
+    ref={ref}
+    className={cn(
+      "z-50 min-w-[8rem] overflow-hidden rounded-md border bg-popover p-1 text-popover-foreground shadow-lg data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 origin-[--radix-context-menu-content-transform-origin]",
+      className
+    )}
+    {...props}
+  />
+))
+ContextMenuSubContent.displayName = ContextMenuPrimitive.SubContent.displayName
+
+const ContextMenuContent = React.forwardRef<
+  React.ElementRef<typeof ContextMenuPrimitive.Content>,
+  React.ComponentPropsWithoutRef<typeof ContextMenuPrimitive.Content>
+>(({ className, ...props }, ref) => (
+  <ContextMenuPrimitive.Portal>
+    <ContextMenuPrimitive.Content
+      ref={ref}
+      className={cn(
+        "z-50 max-h-[--radix-context-menu-content-available-height] min-w-[8rem] overflow-y-auto overflow-x-hidden rounded-md border bg-popover p-1 text-popover-foreground shadow-md data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 origin-[--radix-context-menu-content-transform-origin]",
+        className
+      )}
+      {...props}
+    />
+  </ContextMenuPrimitive.Portal>
+))
+ContextMenuContent.displayName = ContextMenuPrimitive.Content.displayName
+
+const ContextMenuItem = React.forwardRef<
+  React.ElementRef<typeof ContextMenuPrimitive.Item>,
+  React.ComponentPropsWithoutRef<typeof ContextMenuPrimitive.Item> & {
+    inset?: boolean
+  }
+>(({ className, inset, ...props }, ref) => (
+  <ContextMenuPrimitive.Item
+    ref={ref}
+    className={cn(
+      "relative flex cursor-default select-none items-center rounded-sm px-2 py-1.5 text-sm outline-none focus:bg-accent focus:text-accent-foreground data-[disabled]:pointer-events-none data-[disabled]:opacity-50",
+      inset && "pl-8",
+      className
+    )}
+    {...props}
+  />
+))
+ContextMenuItem.displayName = ContextMenuPrimitive.Item.displayName
+
+const ContextMenuCheckboxItem = React.forwardRef<
+  React.ElementRef<typeof ContextMenuPrimitive.CheckboxItem>,
+  React.ComponentPropsWithoutRef<typeof ContextMenuPrimitive.CheckboxItem>
+>(({ className, children, checked, ...props }, ref) => (
+  <ContextMenuPrimitive.CheckboxItem
+    ref={ref}
+    className={cn(
+      "relative flex cursor-default select-none items-center rounded-sm py-1.5 pl-8 pr-2 text-sm outline-none focus:bg-accent focus:text-accent-foreground data-[disabled]:pointer-events-none data-[disabled]:opacity-50",
+      className
+    )}
+    checked={checked}
+    {...props}
+  >
+    <span className="absolute left-2 flex h-3.5 w-3.5 items-center justify-center">
+      <ContextMenuPrimitive.ItemIndicator>
+        <Check className="h-4 w-4" />
+      </ContextMenuPrimitive.ItemIndicator>
+    </span>
+    {children}
+  </ContextMenuPrimitive.CheckboxItem>
+))
+ContextMenuCheckboxItem.displayName =
+  ContextMenuPrimitive.CheckboxItem.displayName
+
+const ContextMenuRadioItem = React.forwardRef<
+  React.ElementRef<typeof ContextMenuPrimitive.RadioItem>,
+  React.ComponentPropsWithoutRef<typeof ContextMenuPrimitive.RadioItem>
+>(({ className, children, ...props }, ref) => (
+  <ContextMenuPrimitive.RadioItem
+    ref={ref}
+    className={cn(
+      "relative flex cursor-default select-none items-center rounded-sm py-1.5 pl-8 pr-2 text-sm outline-none focus:bg-accent focus:text-accent-foreground data-[disabled]:pointer-events-none data-[disabled]:opacity-50",
+      className
+    )}
+    {...props}
+  >
+    <span className="absolute left-2 flex h-3.5 w-3.5 items-center justify-center">
+      <ContextMenuPrimitive.ItemIndicator>
+        <Circle className="h-4 w-4 fill-current" />
+      </ContextMenuPrimitive.ItemIndicator>
+    </span>
+    {children}
+  </ContextMenuPrimitive.RadioItem>
+))
+ContextMenuRadioItem.displayName = ContextMenuPrimitive.RadioItem.displayName
+
+const ContextMenuLabel = React.forwardRef<
+  React.ElementRef<typeof ContextMenuPrimitive.Label>,
+  React.ComponentPropsWithoutRef<typeof ContextMenuPrimitive.Label> & {
+    inset?: boolean
+  }
+>(({ className, inset, ...props }, ref) => (
+  <ContextMenuPrimitive.Label
+    ref={ref}
+    className={cn(
+      "px-2 py-1.5 text-sm font-semibold text-foreground",
+      inset && "pl-8",
+      className
+    )}
+    {...props}
+  />
+))
+ContextMenuLabel.displayName = ContextMenuPrimitive.Label.displayName
+
+const ContextMenuSeparator = React.forwardRef<
+  React.ElementRef<typeof ContextMenuPrimitive.Separator>,
+  React.ComponentPropsWithoutRef<typeof ContextMenuPrimitive.Separator>
+>(({ className, ...props }, ref) => (
+  <ContextMenuPrimitive.Separator
+    ref={ref}
+    className={cn("-mx-1 my-1 h-px bg-border", className)}
+    {...props}
+  />
+))
+ContextMenuSeparator.displayName = ContextMenuPrimitive.Separator.displayName
+
+const ContextMenuShortcut = ({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLSpanElement>) => {
+  return (
+    <span
+      className={cn(
+        "ml-auto text-xs tracking-widest text-muted-foreground",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+ContextMenuShortcut.displayName = "ContextMenuShortcut"
+
+export {
+  ContextMenu,
+  ContextMenuTrigger,
+  ContextMenuContent,
+  ContextMenuItem,
+  ContextMenuCheckboxItem,
+  ContextMenuRadioItem,
+  ContextMenuLabel,
+  ContextMenuSeparator,
+  ContextMenuShortcut,
+  ContextMenuGroup,
+  ContextMenuPortal,
+  ContextMenuSub,
+  ContextMenuSubContent,
+  ContextMenuSubTrigger,
+  ContextMenuRadioGroup,
+}
@@ -0,0 +1,158 @@
+"use client"
+
+import * as React from "react"
+import { XIcon } from "lucide-react"
+import * as DialogPrimitive from "@radix-ui/react-dialog"
+
+import { cn } from "@/lib/utils"
+import { Button } from "@/components/ui/button"
+
+function Dialog({
+  ...props
+}: React.ComponentProps<typeof DialogPrimitive.Root>) {
+  return <DialogPrimitive.Root data-slot="dialog" {...props} />
+}
+
+function DialogTrigger({
+  ...props
+}: React.ComponentProps<typeof DialogPrimitive.Trigger>) {
+  return <DialogPrimitive.Trigger data-slot="dialog-trigger" {...props} />
+}
+
+function DialogPortal({
+  ...props
+}: React.ComponentProps<typeof DialogPrimitive.Portal>) {
+  return <DialogPrimitive.Portal data-slot="dialog-portal" {...props} />
+}
+
+function DialogClose({
+  ...props
+}: React.ComponentProps<typeof DialogPrimitive.Close>) {
+  return <DialogPrimitive.Close data-slot="dialog-close" {...props} />
+}
+
+function DialogOverlay({
+  className,
+  ...props
+}: React.ComponentProps<typeof DialogPrimitive.Overlay>) {
+  return (
+    <DialogPrimitive.Overlay
+      data-slot="dialog-overlay"
+      className={cn(
+        "fixed inset-0 z-50 bg-black/50 data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:animate-in data-[state=open]:fade-in-0",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function DialogContent({
+  className,
+  children,
+  showCloseButton = true,
+  ...props
+}: React.ComponentProps<typeof DialogPrimitive.Content> & {
+  showCloseButton?: boolean
+}) {
+  return (
+    <DialogPortal data-slot="dialog-portal">
+      <DialogOverlay />
+      <DialogPrimitive.Content
+        data-slot="dialog-content"
+        className={cn(
+          "fixed top-[50%] left-[50%] z-50 grid w-full max-w-[calc(100%-2rem)] translate-x-[-50%] translate-y-[-50%] gap-4 rounded-lg border bg-background p-6 shadow-lg duration-200 outline-none data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=closed]:zoom-out-95 data-[state=open]:animate-in data-[state=open]:fade-in-0 data-[state=open]:zoom-in-95 sm:max-w-lg",
+          className
+        )}
+        {...props}
+      >
+        {children}
+        {showCloseButton && (
+          <DialogPrimitive.Close
+            data-slot="dialog-close"
+            className="absolute top-4 right-4 rounded-xs opacity-70 ring-offset-background transition-opacity hover:opacity-100 focus:ring-2 focus:ring-ring focus:ring-offset-2 focus:outline-hidden disabled:pointer-events-none data-[state=open]:bg-accent data-[state=open]:text-muted-foreground [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4"
+          >
+            <XIcon />
+            <span className="sr-only">Close</span>
+          </DialogPrimitive.Close>
+        )}
+      </DialogPrimitive.Content>
+    </DialogPortal>
+  )
+}
+
+function DialogHeader({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="dialog-header"
+      className={cn("flex flex-col gap-2 text-center sm:text-left", className)}
+      {...props}
+    />
+  )
+}
+
+function DialogFooter({
+  className,
+  showCloseButton = false,
+  children,
+  ...props
+}: React.ComponentProps<"div"> & {
+  showCloseButton?: boolean
+}) {
+  return (
+    <div
+      data-slot="dialog-footer"
+      className={cn(
+        "flex flex-col-reverse gap-2 sm:flex-row sm:justify-end",
+        className
+      )}
+      {...props}
+    >
+      {children}
+      {showCloseButton && (
+        <DialogPrimitive.Close asChild>
+          <Button variant="outline">Close</Button>
+        </DialogPrimitive.Close>
+      )}
+    </div>
+  )
+}
+
+function DialogTitle({
+  className,
+  ...props
+}: React.ComponentProps<typeof DialogPrimitive.Title>) {
+  return (
+    <DialogPrimitive.Title
+      data-slot="dialog-title"
+      className={cn("text-lg leading-none font-semibold", className)}
+      {...props}
+    />
+  )
+}
+
+function DialogDescription({
+  className,
+  ...props
+}: React.ComponentProps<typeof DialogPrimitive.Description>) {
+  return (
+    <DialogPrimitive.Description
+      data-slot="dialog-description"
+      className={cn("text-sm text-muted-foreground", className)}
+      {...props}
+    />
+  )
+}
+
+export {
+  Dialog,
+  DialogClose,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogOverlay,
+  DialogPortal,
+  DialogTitle,
+  DialogTrigger,
+}
@@ -0,0 +1,153 @@
+"use client"
+
+import * as React from "react"
+import * as LabelPrimitive from "@radix-ui/react-label"
+import { Slot } from "@radix-ui/react-slot"
+import {
+  Controller,
+  type ControllerProps,
+  type FieldPath,
+  type FieldValues,
+  useFormContext,
+} from "react-hook-form"
+
+import { cn } from "@/lib/utils"
+
+const Form = React.forwardRef<
+  HTMLFormElement,
+  React.ComponentProps<"form">
+>(({ className, ...props }, ref) => {
+  const methods = useFormContext()
+  return (
+    <form ref={ref} className={className} onSubmit={methods.handleSubmit(() => {})} {...props} />
+  )
+})
+Form.displayName = "Form"
+
+// ============================================================
+// FormFieldContext - provides field-level context
+// ============================================================
+
+const FormFieldContext = React.createContext<
+  ControllerProps<FieldValues, string>
+>({} as never)
+
+const FormField = <
+  TFieldValues extends FieldValues = FieldValues,
+  TName extends FieldPath<TFieldValues> = FieldPath<TFieldValues>
+>({
+  ...props
+}: ControllerProps<TFieldValues, TName>) => {
+  const { name } = props
+
+  return (
+    <FormFieldContext.Provider value={props as ControllerProps<FieldValues, string>}>
+      <Controller {...props} />
+    </FormFieldContext.Provider>
+  )
+}
+
+// ============================================================
+// useFormField - must be used inside a FormField
+// ============================================================
+
+function useFormField(): ControllerProps<FieldValues, string> {
+  const fieldContext = React.useContext(FormFieldContext)
+  if (!fieldContext) {
+    throw new Error("useFormField must be used within a FormField")
+  }
+  return fieldContext
+}
+
+// ============================================================
+// FormItem - wraps a labeled form control
+// ============================================================
+
+const FormItem = React.forwardRef<
+  HTMLDivElement,
+  React.HTMLAttributes<HTMLDivElement>
+>(({ className, ...props }, ref) => (
+  <div ref={ref} className={cn("space-y-2", className)} {...props} />
+))
+FormItem.displayName = "FormItem"
+
+// ============================================================
+// FormLabel
+// ============================================================
+
+const FormLabel = React.forwardRef<
+  React.ElementRef<typeof LabelPrimitive.Root>,
+  React.ComponentPropsWithoutRef<typeof LabelPrimitive.Root>
+>(({ className, ...props }, ref) => (
+  <LabelPrimitive.Root
+    ref={ref}
+    className={cn(
+      "text-sm font-medium leading-none peer-disabled:cursor-not-allowed peer-disabled:opacity-70",
+      className
+    )}
+    {...props}
+  />
+))
+FormLabel.displayName = LabelPrimitive.Root.displayName
+
+// ============================================================
+// FormControl - Slot bridge
+// ============================================================
+
+const FormControl = React.forwardRef<
+  React.ElementRef<typeof Slot>,
+  React.ComponentPropsWithoutRef<typeof Slot>
+>(({ ...props }, ref) => (
+  <Slot ref={ref} {...props} />
+))
+FormControl.displayName = "FormControl"
+
+// ============================================================
+// FormDescription
+// ============================================================
+
+const FormDescription = React.forwardRef<
+  HTMLParagraphElement,
+  React.HTMLAttributes<HTMLParagraphElement>
+>(({ className, ...props }, ref) => (
+  <p
+    ref={ref}
+    className={cn("text-sm text-muted-foreground", className)}
+    {...props}
+  />
+))
+FormDescription.displayName = "FormDescription"
+
+// ============================================================
+// FormMessage
+// ============================================================
+
+const FormMessage = React.forwardRef<
+  HTMLParagraphElement,
+  React.HTMLAttributes<HTMLParagraphElement>
+>(({ className, children, ...props }, ref) => {
+  const { error } = useFormField()
+  const body = error ? String(error.message ?? "") : children
+  if (!body) return null
+  return (
+    <p
+      ref={ref}
+      className={cn("text-sm font-medium text-destructive", className)}
+      {...props}
+    >
+      {body}
+    </p>
+  )
+})
+FormMessage.displayName = "FormMessage"
+
+export {
+  Form,
+  FormField,
+  FormItem,
+  FormLabel,
+  FormControl,
+  FormDescription,
+  FormMessage,
+  useFormField,
+}
@@ -0,0 +1,25 @@
+import * as React from "react"
+
+import { cn } from "@/lib/utils"
+
+export interface InputProps
+  extends React.InputHTMLAttributes<HTMLInputElement> {}
+
+const Input = React.forwardRef<HTMLInputElement, InputProps>(
+  ({ className, type, ...props }, ref) => {
+    return (
+      <input
+        type={type}
+        className={cn(
+          "h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background file:border-0 file:bg-transparent file:text-sm file:font-medium placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50",
+          className
+        )}
+        ref={ref}
+        {...props}
+      />
+    )
+  }
+)
+Input.displayName = "Input"
+
+export { Input }
@@ -0,0 +1,20 @@
+import * as React from "react"
+import * as LabelPrimitive from "@radix-ui/react-label"
+import { cn } from "@/lib/utils"
+
+const Label = React.forwardRef<
+  React.ElementRef<typeof LabelPrimitive.Root>,
+  React.ComponentPropsWithoutRef<typeof LabelPrimitive.Root>
+>(({ className, ...props }, ref) => (
+  <LabelPrimitive.Root
+    ref={ref}
+    className={cn(
+      "text-sm font-medium leading-none peer-disabled:cursor-not-allowed peer-disabled:opacity-70",
+      className
+    )}
+    {...props}
+  />
+))
+Label.displayName = LabelPrimitive.Root.displayName
+
+export { Label }
@@ -0,0 +1,41 @@
+import * as React from "react"
+import * as RadioGroupPrimitive from "@radix-ui/react-radio-group"
+import { Circle } from "lucide-react"
+import { cn } from "@/lib/utils"
+
+const RadioGroup = React.forwardRef<
+  React.ElementRef<typeof RadioGroupPrimitive.Root>,
+  React.ComponentPropsWithoutRef<typeof RadioGroupPrimitive.Root>
+>(({ className, ...props }, ref) => {
+  return (
+    <RadioGroupPrimitive.Root
+      className={cn("grid gap-2", className)}
+      {...props}
+      ref={ref}
+    />
+  )
+})
+RadioGroup.displayName = RadioGroupPrimitive.Root.displayName
+
+const RadioGroupItem = React.forwardRef<
+  React.ElementRef<typeof RadioGroupPrimitive.Item>,
+  React.ComponentPropsWithoutRef<typeof RadioGroupPrimitive.Item>
+>(({ className, ...props }, ref) => {
+  return (
+    <RadioGroupPrimitive.Item
+      ref={ref}
+      className={cn(
+        "aspect-square h-4 w-4 rounded-full border border-primary text-primary ring-offset-background focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50",
+        className
+      )}
+      {...props}
+    >
+      <RadioGroupPrimitive.Indicator className="flex items-center justify-center">
+        <Circle className="h-2.5 w-2.5 fill-current text-current" />
+      </RadioGroupPrimitive.Indicator>
+    </RadioGroupPrimitive.Item>
+  )
+})
+RadioGroupItem.displayName = RadioGroupPrimitive.Item.displayName
+
+export { RadioGroup, RadioGroupItem }
@@ -0,0 +1,62 @@
+"use client"
+
+import * as React from "react"
+import { GripVertical } from "lucide-react"
+import * as ResizablePrimitive from "react-resizable-panels"
+
+import { cn } from "@/lib/utils"
+
+const ResizablePanelGroup = React.forwardRef<
+  React.ElementRef<typeof ResizablePrimitive.Group>,
+  React.ComponentPropsWithoutRef<typeof ResizablePrimitive.Group>
+>(({ className, ...props }, ref) => (
+  <ResizablePrimitive.Group
+    ref={ref}
+    className={cn(
+      "flex h-full w-full data-[panel-group-direction=vertical]:flex-col",
+      className
+    )}
+    {...props}
+  />
+))
+ResizablePanelGroup.displayName = "ResizablePanelGroup"
+
+const ResizablePanel = React.forwardRef<
+  React.ElementRef<typeof ResizablePrimitive.Panel>,
+  React.ComponentPropsWithoutRef<typeof ResizablePrimitive.Panel>
+>(({ className, ...props }, ref) => (
+  <ResizablePrimitive.Panel
+    ref={ref}
+    className={cn(
+      "h-full w-full overflow-hidden",
+      className
+    )}
+    {...props}
+  />
+))
+ResizablePanel.displayName = "ResizablePanel"
+
+const ResizableHandle = ({
+  withHandle,
+  className,
+  ...props
+}: React.ComponentPropsWithoutRef<typeof ResizablePrimitive.Separator> & {
+  withHandle?: boolean
+}) => (
+  <ResizablePrimitive.Separator
+    className={cn(
+      "relative flex w-px items-center justify-center bg-border after:absolute after:inset-y-0 after:left-1/2 after:w-1 after:-translate-x-1/2 focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring focus-visible:ring-offset-1 data-[panel-group-direction=vertical]:h-px data-[panel-group-direction=vertical]:w-full data-[panel-group-direction=vertical]:after:left-0 data-[panel-group-direction=vertical]:after:h-1 data-[panel-group-direction=vertical]:after:w-full data-[panel-group-direction=vertical]:after:-translate-y-1/2 data-[panel-group-direction=vertical]:after:translate-x-0 [&[data-panel-group-direction=vertical]>div]:rotate-90",
+      className
+    )}
+    {...props}
+  >
+    {withHandle && (
+      <div className="z-10 flex h-4 w-3 items-center justify-center rounded-sm border bg-border">
+        <GripVertical className="h-2.5 w-2.5" />
+      </div>
+    )}
+  </ResizablePrimitive.Separator>
+)
+ResizableHandle.displayName = "ResizableHandle"
+
+export { ResizablePanelGroup, ResizablePanel, ResizableHandle }
@@ -0,0 +1,47 @@
+"use client"
+
+import * as React from "react"
+import * as ScrollAreaPrimitive from "@radix-ui/react-scroll-area"
+
+import { cn } from "@/lib/utils"
+
+const ScrollArea = React.forwardRef<
+  React.ElementRef<typeof ScrollAreaPrimitive.Root>,
+  React.ComponentPropsWithoutRef<typeof ScrollAreaPrimitive.Root>
+>(({ className, children, ...props }, ref) => (
+  <ScrollAreaPrimitive.Root
+    ref={ref}
+    className={cn("relative overflow-hidden", className)}
+    {...props}
+  >
+    <ScrollAreaPrimitive.Viewport className="h-full w-full rounded-[inherit]">
+      {children}
+    </ScrollAreaPrimitive.Viewport>
+    <ScrollBar />
+    <ScrollAreaPrimitive.Corner />
+  </ScrollAreaPrimitive.Root>
+))
+ScrollArea.displayName = ScrollAreaPrimitive.Root.displayName
+
+const ScrollBar = React.forwardRef<
+  React.ElementRef<typeof ScrollAreaPrimitive.ScrollAreaScrollbar>,
+  React.ComponentPropsWithoutRef<typeof ScrollAreaPrimitive.ScrollAreaScrollbar>
+>(({ className, orientation = "vertical", ...props }, ref) => (
+  <ScrollAreaPrimitive.ScrollAreaScrollbar
+    ref={ref}
+    orientation={orientation}
+    className={cn(
+      "flex touch-none select-none transition-colors",
+      orientation === "vertical" &&
+        "h-full w-2.5 border-l border-l-transparent p-[1px]",
+      orientation === "horizontal" &&
+        "h-2.5 flex-col border-t border-t-transparent p-[1px]",
+      className
+    )}
+    {...props}
+  >
+    <ScrollAreaPrimitive.ScrollAreaThumb className="relative flex-1 rounded-full bg-border" />
+  </ScrollAreaPrimitive.ScrollAreaScrollbar>
+))
+ScrollBar.displayName = ScrollAreaPrimitive.ScrollAreaScrollbar.displayName
+export { ScrollArea, ScrollBar }
@@ -0,0 +1,159 @@
+"use client"
+
+import * as React from "react"
+import * as SelectPrimitive from "@radix-ui/react-select"
+import { Check, ChevronDown, ChevronUp } from "lucide-react"
+import { cn } from "@/lib/utils"
+
+const Select = SelectPrimitive.Root
+
+const SelectGroup = SelectPrimitive.Group
+
+const SelectValue = SelectPrimitive.Value
+
+const SelectTrigger = React.forwardRef<
+  React.ElementRef<typeof SelectPrimitive.Trigger>,
+  React.ComponentPropsWithoutRef<typeof SelectPrimitive.Trigger>
+>(({ className, children, ...props }, ref) => (
+  <SelectPrimitive.Trigger
+    ref={ref}
+    className={cn(
+      "flex h-10 w-full items-center justify-between rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50 [&>span]:line-clamp-1",
+      className
+    )}
+    {...props}
+  >
+    {children}
+    <SelectPrimitive.Icon asChild>
+      <ChevronDown className="h-4 w-4 opacity-50" />
+    </SelectPrimitive.Icon>
+  </SelectPrimitive.Trigger>
+))
+SelectTrigger.displayName = SelectPrimitive.Trigger.displayName
+
+const SelectScrollUpButton = React.forwardRef<
+  React.ElementRef<typeof SelectPrimitive.ScrollUpButton>,
+  React.ComponentPropsWithoutRef<typeof SelectPrimitive.ScrollUpButton>
+>(({ className, ...props }, ref) => (
+  <SelectPrimitive.ScrollUpButton
+    ref={ref}
+    className={cn(
+      "flex cursor-default items-center justify-center py-1",
+      className
+    )}
+    {...props}
+  >
+    <ChevronUp className="h-4 w-4" />
+  </SelectPrimitive.ScrollUpButton>
+))
+SelectScrollUpButton.displayName = SelectPrimitive.ScrollUpButton.displayName
+
+const SelectScrollDownButton = React.forwardRef<
+  React.ElementRef<typeof SelectPrimitive.ScrollDownButton>,
+  React.ComponentPropsWithoutRef<typeof SelectPrimitive.ScrollDownButton>
+>(({ className, ...props }, ref) => (
+  <SelectPrimitive.ScrollDownButton
+    ref={ref}
+    className={cn(
+      "flex cursor-default items-center justify-center py-1",
+      className
+    )}
+    {...props}
+  >
+    <ChevronDown className="h-4 w-4" />
+  </SelectPrimitive.ScrollDownButton>
+))
+SelectScrollDownButton.displayName =
+  SelectPrimitive.ScrollDownButton.displayName
+
+const SelectContent = React.forwardRef<
+  React.ElementRef<typeof SelectPrimitive.Content>,
+  React.ComponentPropsWithoutRef<typeof SelectPrimitive.Content>
+>(({ className, children, position = "popper", ...props }, ref) => (
+  <SelectPrimitive.Portal>
+    <SelectPrimitive.Content
+      ref={ref}
+      className={cn(
+        "relative z-50 max-h-96 min-w-[8rem] overflow-hidden rounded-md border bg-popover text-popover-foreground shadow-md data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2",
+        position === "popper" &&
+          "data-[side=bottom]:translate-y-1 data-[side=left]:-translate-x-1 data-[side=right]:translate-x-1 data-[side=top]:-translate-y-1",
+        className
+      )}
+      position={position}
+      {...props}
+    >
+      <SelectScrollUpButton />
+      <SelectPrimitive.Viewport
+        className={cn(
+          "p-1",
+          position === "popper" &&
+            "h-[var(--radix-select-trigger-height)] w-full min-w-[var(--radix-select-trigger-width)]"
+        )}
+      >
+        {children}
+      </SelectPrimitive.Viewport>
+      <SelectScrollDownButton />
+    </SelectPrimitive.Content>
+  </SelectPrimitive.Portal>
+))
+SelectContent.displayName = SelectPrimitive.Content.displayName
+
+const SelectLabel = React.forwardRef<
+  React.ElementRef<typeof SelectPrimitive.Label>,
+  React.ComponentPropsWithoutRef<typeof SelectPrimitive.Label>
+>(({ className, ...props }, ref) => (
+  <SelectPrimitive.Label
+    ref={ref}
+    className={cn("py-1.5 pl-8 pr-2 text-sm font-semibold", className)}
+    {...props}
+  />
+))
+SelectLabel.displayName = SelectPrimitive.Label.displayName
+
+const SelectItem = React.forwardRef<
+  React.ElementRef<typeof SelectPrimitive.Item>,
+  React.ComponentPropsWithoutRef<typeof SelectPrimitive.Item>
+>(({ className, children, ...props }, ref) => (
+  <SelectPrimitive.Item
+    ref={ref}
+    className={cn(
+      "relative flex w-full cursor-default select-none items-center rounded-sm py-1.5 pl-8 pr-2 text-sm outline-none focus:bg-accent focus:text-accent-foreground data-[disabled]:pointer-events-none data-[disabled]:opacity-50",
+      className
+    )}
+    {...props}
+  >
+    <span className="absolute left-2 flex h-3.5 w-3.5 items-center justify-center">
+      <SelectPrimitive.ItemIndicator>
+        <Check className="h-4 w-4" />
+      </SelectPrimitive.ItemIndicator>
+    </span>
+
+    <SelectPrimitive.ItemText>{children}</SelectPrimitive.ItemText>
+  </SelectPrimitive.Item>
+))
+SelectItem.displayName = SelectPrimitive.Item.displayName
+
+const SelectSeparator = React.forwardRef<
+  React.ElementRef<typeof SelectPrimitive.Separator>,
+  React.ComponentPropsWithoutRef<typeof SelectPrimitive.Separator>
+>(({ className, ...props }, ref) => (
+  <SelectPrimitive.Separator
+    ref={ref}
+    className={cn("-mx-1 my-1 h-px bg-muted", className)}
+    {...props}
+  />
+))
+SelectSeparator.displayName = SelectPrimitive.Separator.displayName
+
+export {
+  Select,
+  SelectGroup,
+  SelectValue,
+  SelectTrigger,
+  SelectContent,
+  SelectLabel,
+  SelectItem,
+  SelectSeparator,
+  SelectScrollUpButton,
+  SelectScrollDownButton,
+}
@@ -0,0 +1,146 @@
+"use client"
+
+import * as React from "react"
+import * as SheetPrimitive from "@radix-ui/react-dialog"
+import { cva, type VariantProps } from "class-variance-authority"
+import { X } from "lucide-react"
+
+import { cn } from "@/lib/utils"
+
+const Sheet = SheetPrimitive.Root
+
+const SheetTrigger = SheetPrimitive.Trigger
+
+const SheetClose = SheetPrimitive.Close
+
+const SheetPortal = ({
+  className,
+  ...props
+}: SheetPrimitive.DialogPortalProps) => (
+  <SheetPrimitive.Portal className={cn(className)} {...props} />
+)
+SheetPortal.displayName = SheetPrimitive.Portal.displayName
+
+const SheetOverlay = React.forwardRef<
+  React.ElementRef<typeof SheetPrimitive.Overlay>,
+  React.ComponentPropsWithoutRef<typeof SheetPrimitive.Overlay>
+>(({ className, ...props }, ref) => (
+  <SheetPrimitive.Overlay
+    className={cn(
+      "fixed inset-0 z-50 bg-background/80 backdrop-blur-sm data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:animate-in data-[state=open]:fade-in-0",
+      className
+    )}
+    {...props}
+    ref={ref}
+  />
+))
+SheetOverlay.displayName = SheetPrimitive.Overlay.displayName
+
+const sheetVariants = cva(
+  "fixed z-50 gap-4 bg-background p-6 shadow-lg transition ease-in-out data-[state=closed]:animate-out data-[state=closed]:duration-300 data-[state=open]:animate-in data-[state=open]:duration-500",
+  {
+    variants: {
+      side: {
+        top: "inset-x-0 top-0 border-b data-[state=closed]:slide-out-to-top data-[state=open]:slide-in-from-top",
+        bottom:
+          "inset-x-0 bottom-0 border-t data-[state=closed]:slide-out-to-bottom data-[state=open]:slide-in-from-bottom",
+        left: "inset-y-0 left-0 h-full w-3/4 border-r data-[state=closed]:slide-out-to-left data-[state=open]:slide-in-from-left sm:max-w-sm",
+        right:
+          "inset-y-0 right-0 h-full w-3/4 border-l data-[state=closed]:slide-out-to-right data-[state=open]:slide-in-from-right sm:max-w-sm"
+      }
+    },
+    defaultVariants: {
+      side: "right"
+    }
+  }
+)
+
+interface SheetContentProps
+  extends React.ComponentPropsWithoutRef<typeof SheetPrimitive.Content>,
+    VariantProps<typeof sheetVariants> {}
+
+const SheetContent = React.forwardRef<
+  React.ElementRef<typeof SheetPrimitive.Content>,
+  SheetContentProps
+>(({ side = "right", className, children, ...props }, ref) => (
+  <SheetPortal>
+    <SheetOverlay />
+    <SheetPrimitive.Content
+      ref={ref}
+      className={cn(sheetVariants({ side }), className)}
+      {...props}
+    >
+      {children}
+      <SheetPrimitive.Close className="absolute top-4 right-4 rounded-sm opacity-70 ring-offset-background transition-opacity hover:opacity-100 focus:ring-2 focus:ring-ring focus:ring-offset-2 focus:outline-none disabled:pointer-events-none data-[state=open]:bg-secondary">
+        <X className="h-4 w-4" />
+        <span className="sr-only">Close</span>
+      </SheetPrimitive.Close>
+    </SheetPrimitive.Content>
+  </SheetPortal>
+))
+SheetContent.displayName = SheetPrimitive.Content.displayName
+
+const SheetHeader = ({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLDivElement>) => (
+  <div
+    className={cn(
+      "flex flex-col space-y-2 text-center sm:text-left",
+      className
+    )}
+    {...props}
+  />
+)
+SheetHeader.displayName = "SheetHeader"
+
+const SheetFooter = ({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLDivElement>) => (
+  <div
+    className={cn(
+      "flex flex-col-reverse sm:flex-row sm:justify-end sm:space-x-2",
+      className
+    )}
+    {...props}
+  />
+)
+SheetFooter.displayName = "SheetFooter"
+
+const SheetTitle = React.forwardRef<
+  React.ElementRef<typeof SheetPrimitive.Title>,
+  React.ComponentPropsWithoutRef<typeof SheetPrimitive.Title>
+>(({ className, ...props }, ref) => (
+  <SheetPrimitive.Title
+    ref={ref}
+    className={cn("text-lg font-semibold text-foreground", className)}
+    {...props}
+  />
+))
+SheetTitle.displayName = SheetPrimitive.Title.displayName
+
+const SheetDescription = React.forwardRef<
+  React.ElementRef<typeof SheetPrimitive.Description>,
+  React.ComponentPropsWithoutRef<typeof SheetPrimitive.Description>
+>(({ className, ...props }, ref) => (
+  <SheetPrimitive.Description
+    ref={ref}
+    className={cn("text-sm text-muted-foreground", className)}
+    {...props}
+  />
+))
+SheetDescription.displayName = SheetPrimitive.Description.displayName
+
+export {
+  Sheet,
+  SheetPortal,
+  SheetOverlay,
+  SheetTrigger,
+  SheetClose,
+  SheetContent,
+  SheetHeader,
+  SheetFooter,
+  SheetTitle,
+  SheetDescription
+}
@@ -0,0 +1,33 @@
+"use client"
+
+import * as React from "react"
+import * as SliderPrimitive from "@radix-ui/react-slider"
+import { cn } from "@/lib/utils"
+
+const Slider = React.forwardRef<
+  React.ElementRef<typeof SliderPrimitive.Root>,
+  React.ComponentPropsWithoutRef<typeof SliderPrimitive.Root>
+>(({ className, ...props }, ref) => {
+  const { 'aria-label': ariaLabel, ...rest } = props;
+  return (
+    <SliderPrimitive.Root
+      ref={ref}
+      className={cn(
+        "relative flex w-full touch-none select-none items-center",
+        className
+      )}
+      {...rest}
+    >
+      <SliderPrimitive.Track className="relative h-2 w-full grow overflow-hidden rounded-full bg-secondary">
+        <SliderPrimitive.Range className="absolute h-full bg-primary" />
+      </SliderPrimitive.Track>
+      <SliderPrimitive.Thumb
+        aria-label={ariaLabel}
+        className="block h-5 w-5 rounded-full border-2 border-primary bg-background ring-offset-background transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50"
+      />
+    </SliderPrimitive.Root>
+  );
+})
+Slider.displayName = SliderPrimitive.Root.displayName
+
+export { Slider }
@@ -0,0 +1,34 @@
+"use client"
+
+import { useTheme } from "next-themes"
+import { Toaster as Sonner } from "sonner"
+
+type ToasterProps = React.ComponentProps<typeof Sonner>
+
+const Toaster = ({ ...props }: ToasterProps) => {
+  const { theme = "system" } = useTheme()
+
+  return (
+    <Sonner
+      theme={theme as ToasterProps["theme"]}
+      className="toaster group"
+      toastOptions={{
+        classNames: {
+          toast:
+            "group toast group-[.toaster]:bg-background group-[.toaster]:text-foreground group-[.toaster]:border-border group-[.toaster]:shadow-lg",
+          description: "group-[.toast]:text-muted-foreground",
+          actionButton:
+            "group-[.toast]:bg-primary group-[.toast]:text-primary-foreground",
+          cancelButton:
+            "group-[.toast]:bg-muted group-[.toast]:text-muted-foreground",
+        },
+      }}
+      richColors
+      closeButton
+      position="bottom-right"
+      {...props}
+    />
+  )
+}
+
+export { Toaster }
@@ -0,0 +1,26 @@
+import * as React from "react"
+import * as SwitchPrimitive from "@radix-ui/react-switch"
+import { cn } from "@/lib/utils"
+
+const Switch = React.forwardRef<
+  React.ElementRef<typeof SwitchPrimitive.Root>,
+  React.ComponentPropsWithoutRef<typeof SwitchPrimitive.Root>
+>(({ className, ...props }, ref) => (
+  <SwitchPrimitive.Root
+    ref={ref}
+    className={cn(
+      "peer inline-flex h-6 w-11 shrink-0 cursor-pointer items-center rounded-full border-2 border-transparent transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-background disabled:cursor-not-allowed disabled:opacity-50 data-[state=checked]:bg-primary data-[state=unchecked]:bg-input",
+      className
+    )}
+    {...props}
+  >
+    <SwitchPrimitive.Thumb
+      className={cn(
+        "pointer-events-none block h-5 w-5 rounded-full bg-background shadow-lg ring-0 transition-transform data-[state=checked]:translate-x-5 data-[state=unchecked]:translate-x-0"
+      )}
+    />
+  </SwitchPrimitive.Root>
+))
+Switch.displayName = SwitchPrimitive.Root.displayName
+
+export { Switch }
@@ -0,0 +1,91 @@
+"use client"
+
+import * as React from "react"
+import { cva, type VariantProps } from "class-variance-authority"
+import * as TabsPrimitive from "@radix-ui/react-tabs"
+
+import { cn } from "@/lib/utils"
+
+function Tabs({
+  className,
+  orientation = "horizontal",
+  ...props
+}: React.ComponentProps<typeof TabsPrimitive.Root>) {
+  return (
+    <TabsPrimitive.Root
+      data-slot="tabs"
+      data-orientation={orientation}
+      orientation={orientation}
+      className={cn(
+        "group/tabs flex gap-2 data-[orientation=horizontal]:flex-col",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+const tabsListVariants = cva(
+  "group/tabs-list inline-flex w-fit items-center justify-center rounded-lg p-[3px] text-muted-foreground group-data-[orientation=horizontal]/tabs:h-9 group-data-[orientation=vertical]/tabs:h-fit group-data-[orientation=vertical]/tabs:flex-col data-[variant=line]:rounded-none",
+  {
+    variants: {
+      variant: {
+        default: "bg-muted",
+        line: "gap-1 bg-transparent",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+    },
+  }
+)
+
+function TabsList({
+  className,
+  variant = "default",
+  ...props
+}: React.ComponentProps<typeof TabsPrimitive.List> &
+  VariantProps<typeof tabsListVariants>) {
+  return (
+    <TabsPrimitive.List
+      data-slot="tabs-list"
+      data-variant={variant}
+      className={cn(tabsListVariants({ variant }), className)}
+      {...props}
+    />
+  )
+}
+
+function TabsTrigger({
+  className,
+  ...props
+}: React.ComponentProps<typeof TabsPrimitive.Trigger>) {
+  return (
+    <TabsPrimitive.Trigger
+      data-slot="tabs-trigger"
+      className={cn(
+        "relative inline-flex h-[calc(100%-1px)] flex-1 items-center justify-center gap-1.5 rounded-md border border-transparent px-2 py-1 text-sm font-medium whitespace-nowrap text-foreground/60 transition-all group-data-[orientation=vertical]/tabs:w-full group-data-[orientation=vertical]/tabs:justify-start hover:text-foreground focus-visible:border-ring focus-visible:ring-[3px] focus-visible:ring-ring/50 focus-visible:outline-1 focus-visible:outline-ring disabled:pointer-events-none disabled:opacity-50 group-data-[variant=default]/tabs-list:data-[state=active]:shadow-sm group-data-[variant=line]/tabs-list:data-[state=active]:shadow-none dark:text-muted-foreground dark:hover:text-foreground [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4",
+        "group-data-[variant=line]/tabs-list:bg-transparent group-data-[variant=line]/tabs-list:data-[state=active]:bg-transparent dark:group-data-[variant=line]/tabs-list:data-[state=active]:border-transparent dark:group-data-[variant=line]/tabs-list:data-[state=active]:bg-transparent",
+        "data-[state=active]:bg-background data-[state=active]:text-foreground dark:data-[state=active]:border-input dark:data-[state=active]:bg-input/30 dark:data-[state=active]:text-foreground",
+        "after:absolute after:bg-foreground after:opacity-0 after:transition-opacity group-data-[orientation=horizontal]/tabs:after:inset-x-0 group-data-[orientation=horizontal]/tabs:after:bottom-[-5px] group-data-[orientation=horizontal]/tabs:after:h-0.5 group-data-[orientation=vertical]/tabs:after:inset-y-0 group-data-[orientation=vertical]/tabs:after:-right-1 group-data-[orientation=vertical]/tabs:after:w-0.5 group-data-[variant=line]/tabs-list:data-[state=active]:after:opacity-100",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function TabsContent({
+  className,
+  ...props
+}: React.ComponentProps<typeof TabsPrimitive.Content>) {
+  return (
+    <TabsPrimitive.Content
+      data-slot="tabs-content"
+      className={cn("flex-1 outline-none", className)}
+      {...props}
+    />
+  )
+}
+
+export { Tabs, TabsList, TabsTrigger, TabsContent, tabsListVariants }
@@ -0,0 +1,24 @@
+import * as React from "react"
+
+import { cn } from "@/lib/utils"
+
+export interface TextareaProps
+  extends React.TextareaHTMLAttributes<HTMLTextAreaElement> {}
+
+const Textarea = React.forwardRef<HTMLTextAreaElement, TextareaProps>(
+  ({ className, ...props }, ref) => {
+    return (
+      <textarea
+        className={cn(
+          "flex min-h-[80px] w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50",
+          className
+        )}
+        ref={ref}
+        {...props}
+      />
+    )
+  }
+)
+Textarea.displayName = "Textarea"
+
+export { Textarea }
@@ -0,0 +1,26 @@
+import { useFileStore } from '@/stores/file-store';
+import { useEditorStore } from '@/stores/editor-store';
+
+export interface ExportSource {
+  source: string;
+  path: string;
+  title: string;
+}
+
+/**
+ * Read the active buffer's content from the editor store. Returns null if
+ * no buffer is open. Components handle the null case (prompt to open a file).
+ */
+export function useExportSource(): ExportSource | null {
+  const activeTabId = useFileStore((s) => s.activeTabId);
+  const openTabs = useFileStore((s) => s.openTabs);
+  const buffer = useEditorStore((s) => (activeTabId ? s.buffers.get(activeTabId) : undefined));
+
+  if (!activeTabId || !buffer) return null;
+  const tab = openTabs.find((t) => t.id === activeTabId);
+  return {
+    source: buffer.content,
+    path: activeTabId,
+    title: tab?.title ?? activeTabId,
+  };
+}
@@ -0,0 +1,72 @@
+import { useEffect } from 'react';
+import { useFileStore } from '@/stores/file-store';
+
+/**
+ * Global keyboard shortcuts for file operations.
+ *
+ * - Cmd/Ctrl+O: open file
+ * - Cmd/Ctrl+Shift+O: open folder
+ * - Cmd/Ctrl+S: save active buffer
+ * - Cmd/Ctrl+W: close active tab
+ * - Cmd/Ctrl+Tab / Cmd/Ctrl+Shift+Tab: next/previous tab (wraps)
+ *
+ * Suppressed when an <input>, <textarea>, or contentEditable element has focus.
+ */
+export function useFileShortcuts(): void {
+  useEffect(() => {
+    function isTypingTarget(target: EventTarget | null): boolean {
+      if (!(target instanceof HTMLElement)) return false;
+      const tag = target.tagName;
+      if (tag === 'INPUT' || tag === 'TEXTAREA') return true;
+      if (target.isContentEditable) return true;
+      return false;
+    }
+
+    function handle(e: KeyboardEvent): void {
+      const mod = e.metaKey || e.ctrlKey;
+      if (!mod) return;
+      if (isTypingTarget(e.target)) return;
+
+      const key = e.key.toLowerCase();
+
+      // Order matters: more specific (Shift) variants first so they don't get
+      // shadowed by the plain modifier-only branch.
+      if (e.shiftKey && key === 'o') {
+        e.preventDefault();
+        void useFileStore.getState().openFolderDialog();
+        return;
+      }
+      if (!e.shiftKey && key === 'o') {
+        e.preventDefault();
+        void useFileStore.getState().openFileDialog();
+        return;
+      }
+      if (!e.shiftKey && key === 's') {
+        e.preventDefault();
+        void useFileStore.getState().saveActiveBuffer();
+        return;
+      }
+      if (!e.shiftKey && key === 'w') {
+        e.preventDefault();
+        const { activeTabId, closeTab } = useFileStore.getState();
+        if (activeTabId) closeTab(activeTabId);
+        return;
+      }
+      if (key === 'tab') {
+        e.preventDefault();
+        const { openTabs, activeTabId, setActiveTab } = useFileStore.getState();
+        if (openTabs.length === 0) return;
+        const idx = activeTabId ? openTabs.findIndex((t) => t.id === activeTabId) : 0;
+        const safeIdx = idx === -1 ? 0 : idx;
+        const nextIdx = e.shiftKey
+          ? (safeIdx <= 0 ? openTabs.length - 1 : safeIdx - 1)
+          : (safeIdx >= openTabs.length - 1 ? 0 : safeIdx + 1);
+        setActiveTab(openTabs[nextIdx].id);
+        return;
+      }
+    }
+
+    window.addEventListener('keydown', handle);
+    return () => window.removeEventListener('keydown', handle);
+  }, []);
+}
@@ -0,0 +1,29 @@
+import { useEffect } from 'react';
+import { ipc } from '@/lib/ipc';
+import { useCommandStore } from '@/stores/command-store';
+import type { CommandId } from '@/stores/command-store';
+
+type Transform<Args = unknown> = (...payload: unknown[]) => Args;
+
+/**
+ * Bridge a native-menu IPC channel to a command-store dispatch.
+ *
+ * When the main process sends `channel` (e.g. `'file-save'`), the optional
+ * `transform` converts the payload to the command's args, then the command
+ * `commandId` is dispatched through the command store.
+ *
+ * The hook cleans up its IPC subscription on unmount.
+ */
+export function useMenuAction<Args = unknown>(
+  channel: string,
+  commandId: CommandId,
+  transform?: Transform<Args>
+): void {
+  useEffect(() => {
+    const unsubscribe = ipc.menu.on(channel, (...payload: unknown[]) => {
+      const args = transform ? transform(...payload) : (payload[0] as Args);
+      useCommandStore.getState().dispatch(commandId, args);
+    });
+    return unsubscribe;
+  }, [channel, commandId, transform]);
+}
@@ -0,0 +1,18 @@
+import { useEffect } from 'react';
+import { useFileStore } from '@/stores/file-store';
+
+/**
+ * On mount, re-opens the last folder if one was persisted via the file store's
+ * zustand persist middleware. Idempotent — re-running with the same path is a
+ * no-op (openFolder's list IPC call would just re-fetch, which is acceptable).
+ */
+export function useRestoreLastFolder(): void {
+  useEffect(() => {
+    const { rootPath, openFolder, tree } = useFileStore.getState();
+    if (rootPath && !tree) {
+      void openFolder(rootPath);
+    }
+    // Run once on mount only. Persist hydration happens before AppShell renders.
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+}
@@ -0,0 +1,28 @@
+import { useCallback, useRef } from 'react';
+
+interface Options {
+  onEditorScroll?: (ratio: number) => void;
+  onPreviewScroll?: (ratio: number) => void;
+}
+
+export function useScrollSync(opts: Options) {
+  const FRAME_MS = 1000 / 60;
+  const lastTick = useRef(-FRAME_MS);
+
+  const handleEditorScroll = useCallback((evt: React.UIEvent<HTMLElement>) => {
+    const target = evt.currentTarget;
+    const ratio = target.scrollTop / Math.max(target.scrollHeight - target.clientHeight, 1);
+    const now = performance.now();
+    if (now - lastTick.current < FRAME_MS) return;
+    lastTick.current = now;
+    opts.onEditorScroll?.(ratio);
+  }, [opts]);
+
+  const handlePreviewScroll = useCallback((evt: React.UIEvent<HTMLElement>) => {
+    const target = evt.currentTarget;
+    const ratio = target.scrollTop / Math.max(target.scrollHeight - target.clientHeight, 1);
+    opts.onPreviewScroll?.(ratio);
+  }, [opts]);
+
+  return { handleEditorScroll, handlePreviewScroll };
+}
@@ -0,0 +1,96 @@
+import { useEffect } from 'react';
+
+/**
+ * Bind a keyboard shortcut to a callback.
+ *
+ * Combos use `+` separators. Tokens:
+ *   - `mod`         → meta (Mac) or ctrl (others)
+ *   - `ctrl`        → ctrl only
+ *   - `meta`        → meta only
+ *   - `alt`         → alt / option
+ *   - `shift`       → shift
+ *   - any single char (case-insensitive), e.g. `s`, `S`
+ *   - special names: `Tab`, `Enter`, `Escape`, `Space`, `ArrowUp/Down/Left/Right`
+ *
+ * The hook is suppressed when the keydown target is an `<input>`, `<textarea>`,
+ * or contentEditable element, mirroring the standard browser shortcut pattern.
+ *
+ * On match, `event.preventDefault()` is called.
+ */
+export function useShortcut(combo: string, callback: (e: KeyboardEvent) => void): void {
+  useEffect(() => {
+    const tokens = parseCombo(combo);
+
+    function isTypingTarget(target: EventTarget | null): boolean {
+      if (!(target instanceof HTMLElement)) return false;
+      const tag = target.tagName;
+      if (tag === 'INPUT' || tag === 'TEXTAREA') return true;
+      if (target.isContentEditable) return true;
+      return false;
+    }
+
+    function handle(e: KeyboardEvent): void {
+      if (isTypingTarget(e.target)) return;
+      if (!matchCombo(tokens, e)) return;
+      e.preventDefault();
+      callback(e);
+    }
+
+    window.addEventListener('keydown', handle);
+    return () => window.removeEventListener('keydown', handle);
+  }, [combo, callback]);
+}
+
+interface ComboSpec {
+  mod?: boolean;
+  ctrl?: boolean;
+  meta?: boolean;
+  alt?: boolean;
+  shift?: boolean;
+  key: string; // lowercased
+}
+
+function parseCombo(combo: string): ComboSpec {
+  const parts = combo
+    .split('+')
+    .map((p) => p.trim())
+    .filter(Boolean);
+  const spec: ComboSpec = { key: '' };
+  for (const p of parts) {
+    const lower = p.toLowerCase();
+    if (lower === 'mod') spec.mod = true;
+    else if (lower === 'ctrl' || lower === 'control') spec.ctrl = true;
+    else if (lower === 'meta' || lower === 'cmd' || lower === 'command') spec.meta = true;
+    else if (lower === 'alt' || lower === 'option') spec.alt = true;
+    else if (lower === 'shift') spec.shift = true;
+    else spec.key = lower;
+  }
+  return spec;
+}
+
+function matchCombo(spec: ComboSpec, e: KeyboardEvent): boolean {
+  const key = e.key.toLowerCase();
+  if (key !== spec.key) return false;
+
+  if (spec.mod) {
+    if (!(e.metaKey || e.ctrlKey)) return false;
+  }
+  if (spec.ctrl && !e.ctrlKey) return false;
+  if (spec.meta && !e.metaKey) return false;
+  if (spec.alt && !e.altKey) return false;
+  if (spec.shift && !e.shiftKey) return false;
+
+  // Reject extra modifiers that the spec did not ask for.
+  // (e.g. spec says "mod+s" but user pressed "mod+shift+s" → no match.)
+  if (!spec.shift && e.shiftKey) return false;
+  if (!spec.alt && e.altKey) return false;
+  // ctrl/meta: if spec did not require mod, ctrl or meta must be absent.
+  if (!spec.mod && !spec.ctrl && e.ctrlKey) return false;
+  if (!spec.mod && !spec.meta && e.metaKey) return false;
+  // If spec said "mod" only, ctrl+meta is allowed (mod is either-or).
+  if (spec.mod && !spec.ctrl && !spec.meta) {
+    // ok
+  }
+
+  return true;
+}
@@ -0,0 +1,15 @@
+import { useEffect } from 'react';
+import { useAppStore } from '@/stores/app-store';
+import { useSettingsStore } from '@/stores/settings-store';
+
+/**
+ * On first mount, if the user hasn't dismissed the welcome dialog, open it.
+ * Call once at the top of App.tsx.
+ */
+export function useWelcomeTrigger() {
+  useEffect(() => {
+    if (!useSettingsStore.getState().welcomeDismissed) {
+      useAppStore.getState().openModal('welcome');
+    }
+  }, []);
+}
@@ -0,0 +1,44 @@
+/**
+ * Convert a 2D string array to a fixed-width ASCII table with `| ... |` rows
+ * and a `| --- |` separator.
+ */
+export function toAsciiTable(rows: string[][]): string {
+  if (rows.length === 0) return '';
+  const numCols = Math.max(...rows.map((r) => r.length));
+  const widths: number[] = Array.from({ length: numCols }, (_, c) =>
+    Math.max(...rows.map((r) => (r[c] ?? '').length))
+  );
+  // Heuristic: if ANY column header starts with a digit, right-align ALL columns
+  const header = rows[0];
+  const rightAlign = header.some((cell) => /^\d/.test(cell));
+  const pad = rightAlign
+    ? (s: string, w: number) => s.padStart(w)
+    : (s: string, w: number) => s.padEnd(w);
+  const lines = rows.map((row) =>
+    '| ' +
+    Array.from({ length: numCols }, (_, c) => pad(row[c] ?? '', widths[c])).join(' | ') +
+    ' |'
+  );
+  // Insert separator after first row
+  const sep =
+    '| ' + Array.from({ length: numCols }, (_, c) => '-'.repeat(widths[c])).join(' | ') + ' |';
+  return [lines[0], sep, ...lines.slice(1)].join('\n');
+}
+
+// Matches a markdown table block: header row, separator, ≥1 data row.
+const TABLE_RE = /^\|.+\|\n^\|[\s:|-]+\|\n((?:^\|.+\|\n?)+)/gm;
+
+/**
+ * Replace all markdown tables in `source` with fenced code blocks containing
+ * the ASCII-rendered equivalent. Non-table content is preserved verbatim.
+ */
+export function applyAsciiTransform(source: string): string {
+  return source.replace(TABLE_RE, (block) => {
+    const lines = block.trim().split('\n');
+    const header = lines[0].slice(1, -1).split('|').map((s) => s.trim());
+    const body = lines.slice(2).map((l) =>
+      l.slice(1, -1).split('|').map((s) => s.trim())
+    );
+    return '```\n' + toAsciiTable([header, ...body]) + '\n```';
+  });
+}
@@ -0,0 +1,112 @@
+import { useEffect } from 'react';
+import { useCommandStore } from '@/stores/command-store';
+import { useFileStore } from '@/stores/file-store';
+import { useAppStore } from '@/stores/app-store';
+import { useMenuAction } from '@/hooks/use-menu-action';
+
+/**
+ * Register all Phase 6 menu commands in the command store, and bridge
+ * the native menu IPC channels to the matching command ids.
+ *
+ * Phase 6 scope: file/view/tab commands with direct store mappings.
+ * Phase 7+ will add the dialog-driven commands (export, settings, etc.)
+ * once the corresponding modals exist.
+ */
+export function registerMenuCommands(): void {
+  const { registerMany } = useCommandStore.getState();
+
+  registerMany({
+    'settings.open': () => useAppStore.getState().openModal('settings'),
+    'help.about': () => useAppStore.getState().openModal('about'),
+    'help.welcome': () => useAppStore.getState().openModal('welcome'),
+    'file.exportPdf': () => {
+      const activeTabId = useFileStore.getState().activeTabId;
+      if (!activeTabId) return;
+      useAppStore.getState().openModal('export-pdf', { sourcePath: activeTabId });
+    },
+    'file.exportDocx': () => {
+      const activeTabId = useFileStore.getState().activeTabId;
+      if (!activeTabId) return;
+      useAppStore.getState().openModal('export-docx', { sourcePath: activeTabId });
+    },
+    'file.exportHtml': () => {
+      const activeTabId = useFileStore.getState().activeTabId;
+      if (!activeTabId) return;
+      useAppStore.getState().openModal('export-html', { sourcePath: activeTabId });
+    },
+    'file.exportBatch': () => {
+      const paths = useFileStore.getState().openTabs.map((t) => t.path);
+      if (paths.length === 0) return;
+      useAppStore.getState().openModal('export-batch', { sourcePaths: paths });
+    },
+    'file.confirmClose': () => {
+      /* stub — wired in later phase */
+    },
+    'app.quit': () => {
+      /* stub — wired in later phase */
+    },
+  });
+
+  const { register } = useCommandStore.getState();
+  register('file.open', () => {
+    void useFileStore.getState().openFileDialog();
+  });
+  register('file.openFolder', () => {
+    void useFileStore.getState().openFolderDialog();
+  });
+  register('file.save', () => {
+    void useFileStore.getState().saveActiveBuffer();
+  });
+  register('file.closeTab', () => {
+    const { activeTabId, closeTab } = useFileStore.getState();
+    if (activeTabId) closeTab(activeTabId);
+  });
+  register('tab.next', () => {
+    const { openTabs, activeTabId, setActiveTab } = useFileStore.getState();
+    if (openTabs.length === 0) return;
+    const idx = activeTabId ? openTabs.findIndex((t) => t.id === activeTabId) : 0;
+    const safeIdx = idx === -1 ? 0 : idx;
+    const nextIdx = safeIdx >= openTabs.length - 1 ? 0 : safeIdx + 1;
+    setActiveTab(openTabs[nextIdx].id);
+  });
+  register('tab.prev', () => {
+    const { openTabs, activeTabId, setActiveTab } = useFileStore.getState();
+    if (openTabs.length === 0) return;
+    const idx = activeTabId ? openTabs.findIndex((t) => t.id === activeTabId) : 0;
+    const safeIdx = idx === -1 ? 0 : idx;
+    const nextIdx = safeIdx <= 0 ? openTabs.length - 1 : safeIdx - 1;
+    setActiveTab(openTabs[nextIdx].id);
+  });
+  register('view.toggleSidebar', () => useAppStore.getState().toggleSidebar());
+  register('view.togglePreview', () => useAppStore.getState().togglePreview());
+}
+
+export function useRegisterMenuCommands(): void {
+  // Register handlers in the command store.
+  useEffect(() => {
+    registerMenuCommands();
+  }, []);
+}
+
+/**
+ * Wire native-menu IPC channels to the command store.
+ * Channel names match what main.js dispatches via webContents.send.
+ */
+export function useBridgeNativeMenu(): void {
+  useMenuAction('file-save', 'file.save');
+  useMenuAction('toggle-preview', 'view.togglePreview');
+  useMenuAction('toggle-command-palette', 'command.palette');
+  useMenuAction('toggle-sidebar-panel', 'view.sidebarPanel', (panel) => panel as string);
+  useMenuAction('toggle-bottom-panel', 'view.bottomPanel');
+  useMenuAction('toggle-find', 'find.toggle');
+  useMenuAction('undo', 'editor.undo');
+  useMenuAction('redo', 'editor.redo');
+  useMenuAction('adjust-font-size', 'font.size', (direction) => direction as string);
+  useMenuAction('load-custom-css', 'theme.loadCustomCss');
+  useMenuAction('clear-custom-css', 'theme.clearCustomCss');
+  useMenuAction('load-template-menu', 'template.load', (name) => name as string);
+  useMenuAction('print-preview', 'print.preview');
+  useMenuAction('print-preview-styled', 'print.previewStyled');
+  useMenuAction('file-opened', 'file.opened', (payload) => payload);
+  useMenuAction('clear-recent-files', 'file.clearRecent');
+}
@@ -66,6 +66,10 @@ export const ipc = {
      safeCall('file', 'write', path, content),
    list: (dir: string): Promise<IpcResult<FileEntry[] | ChannelMissing>> =>
      safeCall('file', 'list', dir),
+    pickFolder: (): Promise<IpcResult<string | null | ChannelMissing>> =>
+      safeCall('file', 'pickFolder'),
+    pickFile: (): Promise<IpcResult<string | null | ChannelMissing>> =>
+      safeCall('file', 'pickFile'),
    onChange: (cb: (path: string) => void): (() => void) => {
      if (typeof window === 'undefined' || !window.electronAPI?.file?.onChange) {
        return () => {};
@@ -91,4 +95,16 @@ export const ipc = {
    showItemInFolder: (path: string): Promise<IpcResult<void | ChannelMissing>> =>
      safeCall('app', 'showItemInFolder', path),
  },
+  menu: {
+    /**
+     * Subscribe to a native-menu IPC channel. The callback receives the
+     * raw payload(s) from the main process. Returns an unsubscribe fn.
+     */
+    on: (channel: string, callback: (...args: unknown[]) => void): (() => void) => {
+      if (typeof window === 'undefined' || !window.electronAPI?.on) {
+        return () => {};
+      }
+      return window.electronAPI.on(channel, callback as (...a: any[]) => void);
+    },
+  },
 };
@@ -0,0 +1,29 @@
+import { marked } from 'marked';
+import DOMPurify from 'dompurify';
+
+marked.setOptions({
+  gfm: true,
+  breaks: false,
+});
+
+const MERMAID_RE = /```mermaid\n([\s\S]*?)```/g;
+
+export function renderMarkdown(source: string): string {
+  // Mark mermaid blocks with a placeholder we can replace client-side.
+  const placeholders: string[] = [];
+  const withPlaceholders = source.replace(MERMAID_RE, (_m, code) => {
+    const idx = placeholders.length;
+    placeholders.push(code.trim());
+    return `<div class="mermaid-block" data-mermaid-source="${idx}"></div>`;
+  });
+
+  const rawHtml = marked.parse(withPlaceholders, { async: false }) as string;
+  const clean = DOMPurify.sanitize(rawHtml, {
+    ALLOWED_ATTR: ['href', 'src', 'alt', 'title', 'class', 'data-mermaid-source', 'data-language', 'id'],
+  });
+
+  // The sanitized HTML still has placeholders; we leave the actual mermaid
+  // rendering to the React layer (MermaidLazy component) so the heavy
+  // mermaid library only loads when needed.
+  return clean;
+}
@@ -0,0 +1,22 @@
+import { toast as sonnerToast } from 'sonner';
+
+/**
+ * Typed wrappers over sonner's toast API. Centralizing the import gives us
+ * a single surface to evolve (e.g., add brand colors, action buttons,
+ * analytics) without touching every call site.
+ */
+export const toast = {
+  success: (message: string) => sonnerToast.success(message),
+  error: (message: string) => sonnerToast.error(message),
+  info: (message: string) => sonnerToast.info(message),
+  warning: (message: string) => sonnerToast.warning(message),
+  promise: <T>(
+    promise: Promise<T>,
+    msgs: {
+      loading: string;
+      success: string | ((data: T) => string);
+      error: string | ((err: unknown) => string);
+    }
+  ) => sonnerToast.promise(promise, msgs),
+  dismiss: (id?: string | number) => sonnerToast.dismiss(id),
+};
@@ -0,0 +1,48 @@
+import { z } from 'zod';
+
+export const settingsSchema = z.object({
+  fontSize: z.number().min(10).max(24).default(14),
+  tabSize: z.union([z.literal(2), z.literal(4), z.literal(8)]).default(4),
+  lineNumbers: z.boolean().default(true),
+  wordWrap: z.boolean().default(true),
+  minimap: z.boolean().default(true),
+  theme: z.enum(['light', 'dark', 'auto']).default('auto'),
+  accentColor: z.enum(['brand', 'blue', 'green', 'purple', 'orange']).default('brand'),
+  fontFamily: z.enum(['system', 'jetbrains', 'fira']).default('system'),
+  pdfFormat: z.enum(['letter', 'a4', 'legal']).default('a4'),
+  pdfMargins: z.enum(['normal', 'narrow', 'wide']).default('normal'),
+  pdfEmbedFonts: z.boolean().default(true),
+  docxTemplate: z.enum(['standard', 'minimal', 'modern']).default('standard'),
+  htmlHighlightStyle: z.enum(['github', 'monokai', 'nord', 'none']).default('github'),
+  renderTablesAsAscii: z.boolean().default(false),
+  welcomeDismissed: z.boolean().default(false),
+});
+export type Settings = z.infer<typeof settingsSchema>;
+
+export const exportPdfSchema = z.object({
+  format: z.enum(['letter', 'a4', 'legal']),
+  margins: z.enum(['normal', 'narrow', 'wide']),
+  embedFonts: z.boolean(),
+  renderTablesAsAscii: z.boolean().optional(),
+});
+export type ExportPdfOptions = z.infer<typeof exportPdfSchema>;
+
+export const exportDocxSchema = z.object({
+  template: z.enum(['standard', 'minimal', 'modern']),
+  renderTablesAsAscii: z.boolean().optional(),
+});
+export type ExportDocxOptions = z.infer<typeof exportDocxSchema>;
+
+export const exportHtmlSchema = z.object({
+  standalone: z.boolean(),
+  highlightStyle: z.enum(['github', 'monokai', 'nord', 'none']),
+  renderTablesAsAscii: z.boolean().optional(),
+});
+export type ExportHtmlOptions = z.infer<typeof exportHtmlSchema>;
+
+export const exportBatchSchema = z.object({
+  format: z.enum(['pdf', 'docx', 'html', 'png']),
+  concurrency: z.number().int().min(1).max(16),
+  filePaths: z.array(z.string()).min(1),
+});
+export type ExportBatchOptions = z.infer<typeof exportBatchSchema>;
@@ -0,0 +1,80 @@
+import { create } from 'zustand';
+import { persist } from 'zustand/middleware';
+
+export interface PaneSizes {
+  sidebar: number;
+  editor: number;
+  preview: number;
+}
+
+export interface ConfirmProps {
+  title: string;
+  body: string;
+  confirmLabel?: string;
+  cancelLabel?: string;
+  destructive?: boolean;
+  onConfirm: () => void | Promise<void>;
+  onCancel?: () => void;
+}
+
+export type ModalState =
+  | { kind: null }
+  | { kind: 'export-pdf'; props: { sourcePath: string } }
+  | { kind: 'export-docx'; props: { sourcePath: string } }
+  | { kind: 'export-html'; props: { sourcePath: string } }
+  | { kind: 'export-batch'; props: { sourcePaths: string[] } }
+  | { kind: 'settings' }
+  | { kind: 'about' }
+  | { kind: 'welcome' }
+  | { kind: 'confirm'; props: ConfirmProps };
+
+export type ModalKind = ModalState['kind'];
+
+interface AppState {
+  sidebarVisible: boolean;
+  previewVisible: boolean;
+  zenMode: boolean;
+  paneSizes: PaneSizes;
+  modal: ModalState;
+  toggleSidebar: () => void;
+  togglePreview: () => void;
+  setZenMode: (value: boolean) => void;
+  setPaneSizes: (sizes: PaneSizes) => void;
+  openModal: <K extends NonNullable<ModalKind>>(
+    kind: K,
+    ...args: Extract<ModalState, { kind: K }> extends { props: infer P } ? [props?: P] : []
+  ) => void;
+  closeModal: () => void;
+}
+
+export const useAppStore = create<AppState>()(
+  persist(
+    (set) => ({
+      sidebarVisible: true,
+      previewVisible: true,
+      zenMode: false,
+      paneSizes: { sidebar: 20, editor: 50, preview: 30 },
+      modal: { kind: null },
+      toggleSidebar: () => set((s) => ({ sidebarVisible: !s.sidebarVisible })),
+      togglePreview: () => set((s) => ({ previewVisible: !s.previewVisible })),
+      setZenMode: (value) => set({ zenMode: value }),
+      setPaneSizes: (sizes) => set({ paneSizes: sizes }),
+      openModal: (kind, ...args) =>
+        set(() => {
+          const candidate = { kind, ...(args[0] ? { props: args[0] } : {}) } as ModalState;
+          return { modal: candidate };
+        }),
+      closeModal: () => set({ modal: { kind: null } }),
+    }),
+    {
+      name: 'mc-app-store',
+      partialize: (state) => ({
+        sidebarVisible: state.sidebarVisible,
+        previewVisible: state.previewVisible,
+        zenMode: state.zenMode,
+        paneSizes: state.paneSizes,
+        // modal is intentionally NOT persisted (runtime-only)
+      }),
+    }
+  )
+);
@@ -0,0 +1,66 @@
+import { create } from 'zustand';
+import { persist } from 'zustand/middleware';
+
+export type CommandId = string;
+
+export type CommandHandler = (args?: unknown) => void | Promise<void>;
+
+/**
+ * User-customizable key binding for a command.
+ * Format: same as useShortcut combo ('mod+s', 'mod+shift+s', etc.)
+ * Undefined means "use the default binding" (if any).
+ */
+export type UserBindings = Record<string, string>;
+
+interface CommandState {
+  handlers: Record<string, CommandHandler>;
+  userBindings: UserBindings;
+  register: (id: CommandId, handler: CommandHandler) => void;
+  registerMany: (handlers: Record<string, CommandHandler>) => void;
+  unregister: (id: CommandId) => void;
+  dispatch: (id: CommandId, args?: unknown) => void;
+  get: (id: CommandId) => CommandHandler | undefined;
+  setUserBinding: (id: CommandId, combo: string) => void;
+  clearUserBinding: (id: CommandId) => void;
+  getUserBinding: (id: CommandId) => string | undefined;
+}
+
+export const useCommandStore = create<CommandState>()(
+  persist(
+    (set, get) => ({
+      handlers: {},
+      userBindings: {},
+      register: (id, handler) =>
+        set((s) => ({ handlers: { ...s.handlers, [id]: handler } })),
+      registerMany: (handlers) =>
+        set((s) => ({ handlers: { ...s.handlers, ...handlers } })),
+      unregister: (id) =>
+        set((s) => {
+          const next = { ...s.handlers };
+          delete next[id];
+          return { handlers: next };
+        }),
+      dispatch: (id, args) => {
+        const handler = get().handlers[id];
+        if (handler) {
+          void handler(args);
+        }
+      },
+      get: (id) => get().handlers[id],
+      setUserBinding: (id, combo) =>
+        set((s) => ({ userBindings: { ...s.userBindings, [id]: combo } })),
+      clearUserBinding: (id) =>
+        set((s) => {
+          const next = { ...s.userBindings };
+          delete next[id];
+          return { userBindings: next };
+        }),
+      getUserBinding: (id) => get().userBindings[id],
+    }),
+    {
+      name: 'mc-command-store',
+      // Only persist user-customizable bindings; handlers are runtime-only.
+      partialize: (state) => ({ userBindings: state.userBindings }),
+    }
+  )
+);
@@ -0,0 +1,63 @@
+import { create } from 'zustand';
+import { immer } from 'zustand/middleware/immer';
+import { enableMapSet } from 'immer';
+
+enableMapSet();
+
+export interface Buffer {
+  id: string;
+  path: string;
+  content: string;
+  dirty: boolean;
+  cursor?: { line: number; column: number };
+}
+
+interface EditorState {
+  buffers: Map<string, Buffer>;
+  activeId: string | null;
+  openBuffer: (id: string, path: string, content: string) => void;
+  updateContent: (id: string, content: string) => void;
+  markSaved: (id: string) => void;
+  setCursor: (id: string, line: number, column: number) => void;
+  closeBuffer: (id: string) => void;
+  setActive: (id: string) => void;
+}
+
+export const useEditorStore = create<EditorState>()(
+  immer((set) => ({
+    buffers: new Map(),
+    activeId: null,
+    openBuffer: (id, path, content) =>
+      set((s) => {
+        s.buffers.set(id, { id, path, content, dirty: false });
+        s.activeId = id;
+      }),
+    updateContent: (id, content) =>
+      set((s) => {
+        const buf = s.buffers.get(id);
+        if (buf) {
+          buf.content = content;
+          buf.dirty = true;
+        }
+      }),
+    markSaved: (id) =>
+      set((s) => {
+        const buf = s.buffers.get(id);
+        if (buf) buf.dirty = false;
+      }),
+    setCursor: (id, line, column) =>
+      set((s) => {
+        const buf = s.buffers.get(id);
+        if (buf) buf.cursor = { line, column };
+      }),
+    closeBuffer: (id) =>
+      set((s) => {
+        s.buffers.delete(id);
+        if (s.activeId === id) s.activeId = null;
+      }),
+    setActive: (id) =>
+      set((s) => {
+        s.activeId = id;
+      }),
+  }))
+);
@@ -0,0 +1,247 @@
+import { create } from 'zustand';
+import { persist, createJSONStorage } from 'zustand/middleware';
+import { immer } from 'zustand/middleware/immer';
+import { enableMapSet } from 'immer';
+import { ipc } from '@/lib/ipc';
+import { toast } from '@/lib/toast';
+import { useEditorStore } from '@/stores/editor-store';
+import type { FileEntry } from '@/types/ipc';
+
+enableMapSet();
+
+export interface FileNode {
+  name: string;
+  path: string;
+  isDirectory: boolean;
+  children: FileNode[] | null;
+  expanded?: boolean;
+  loaded?: boolean;
+}
+
+export interface OpenTab {
+  id: string;
+  path: string;
+  title: string;
+  dirty: boolean;
+}
+
+interface FileState {
+  tree: FileNode | null;
+  rootPath: string | null;
+  expanded: Set<string>;
+  openTabs: OpenTab[];
+  activeTabId: string | null;
+
+  openFolder: (path: string) => Promise<void>;
+  loadChildren: (dirPath: string) => Promise<void>;
+  toggleExpanded: (dirPath: string) => void;
+  openFile: (filePath: string) => Promise<void>;
+  closeTab: (id: string) => void;
+  setActiveTab: (id: string) => void;
+  markTabClean: (id: string) => void;
+  markTabDirty: (id: string) => void;
+  reorderTabs: (fromIndex: number, toIndex: number) => void;
+  openFolderDialog: () => Promise<void>;
+  openFileDialog: () => Promise<void>;
+  saveActiveBuffer: () => Promise<boolean>;
+}
+
+function entryToNode(entry: FileEntry): FileNode {
+  return {
+    name: entry.name,
+    path: entry.path,
+    isDirectory: entry.isDirectory,
+    children: null, // lazy: start unloaded; loadChildren populates this
+  };
+}
+
+// Recursively find and update a directory node by path using immer's produce
+function updateNode(tree: FileNode, dirPath: string, updater: (node: FileNode) => void): boolean {
+  if (tree.path === dirPath && tree.isDirectory) {
+    updater(tree);
+    return true;
+  }
+  if (tree.children) {
+    for (const child of tree.children) {
+      if (updateNode(child, dirPath, updater)) return true;
+    }
+  }
+  return false;
+}
+
+export const useFileStore = create<FileState>()(
+  persist(
+    immer((set) => ({
+    tree: null,
+    rootPath: null,
+    expanded: new Set<string>(),
+    openTabs: [],
+    activeTabId: null,
+
+    openFolder: async (path) => {
+      const result = await ipc.file.list(path);
+      if (!result.ok) {
+        toast.error(`Failed to open folder: ${result.error.message}`);
+        return;
+      }
+
+      const children: FileNode[] = result.data!.map(entryToNode);
+
+      set((s) => {
+        s.tree = {
+          name: path.split('/').filter(Boolean).pop() ?? path,
+          path,
+          isDirectory: true,
+          children,
+          loaded: true,
+        };
+        s.rootPath = path;
+      });
+    },
+
+    loadChildren: async (dirPath) => {
+      // Find the node first
+      const tree = useFileStore.getState().tree;
+      if (!tree) return;
+
+      let found = false;
+      updateNode(tree, dirPath, (node) => {
+        if (node.loaded === true) return;
+        found = true;
+      });
+      if (!found) return;
+
+      const result = await ipc.file.list(dirPath);
+      if (!result.ok) return;
+
+      set((s) => {
+        updateNode(s.tree!, dirPath, (node) => {
+          node.children = result.data!.map(entryToNode);
+          node.loaded = true;
+        });
+      });
+    },
+
+    toggleExpanded: (dirPath) => {
+      set((s) => {
+        if (s.expanded.has(dirPath)) {
+          s.expanded.delete(dirPath);
+        } else {
+          s.expanded.add(dirPath);
+        }
+      });
+    },
+
+    openFile: async (filePath) => {
+      // If already open, sync dirty flag from editor buffer and activate
+      const existing = useFileStore.getState().openTabs.find((t) => t.id === filePath);
+      if (existing) {
+        const buffer = useEditorStore.getState().buffers.get(filePath);
+        set((s) => {
+          s.activeTabId = filePath;
+          if (buffer) {
+            const tab = s.openTabs.find((t) => t.id === filePath);
+            if (tab) tab.dirty = buffer.dirty;
+          }
+        });
+        return;
+      }
+
+      const result = await ipc.file.read(filePath);
+      if (!result.ok) {
+        toast.error(`Failed to open file: ${result.error.message}`);
+        return;
+      }
+
+      const content = result.data!;
+      const title = filePath.split('/').pop() ?? filePath;
+
+      // Open in editor store
+      useEditorStore.getState().openBuffer(filePath, filePath, content);
+
+      set((s) => {
+        s.openTabs.push({ id: filePath, path: filePath, title, dirty: false });
+        s.activeTabId = filePath;
+      });
+    },
+
+    closeTab: (id) => {
+      set((s) => {
+        const idx = s.openTabs.findIndex((t) => t.id === id);
+        if (idx === -1) return;
+        s.openTabs.splice(idx, 1);
+        if (s.activeTabId === id) {
+          s.activeTabId = idx > 0 ? s.openTabs[idx - 1]?.id ?? null : null;
+        }
+      });
+    },
+
+    setActiveTab: (id) => {
+      set((s) => {
+        s.activeTabId = id;
+      });
+    },
+
+    markTabClean: (id) => {
+      set((s) => {
+        const tab = s.openTabs.find((t) => t.id === id);
+        if (tab) tab.dirty = false;
+      });
+    },
+
+    markTabDirty: (id) => {
+      set((s) => {
+        const tab = s.openTabs.find((t) => t.id === id);
+        if (tab) tab.dirty = true;
+      });
+    },
+
+    reorderTabs: (fromIndex, toIndex) => {
+      set((s) => {
+        const tabs = s.openTabs;
+        const [moved] = tabs.splice(fromIndex, 1);
+        tabs.splice(toIndex, 0, moved);
+      });
+    },
+
+    openFolderDialog: async () => {
+      const result = await ipc.file.pickFolder();
+      if (!result.ok || result.data === null) return;
+      await useFileStore.getState().openFolder(result.data);
+    },
+
+    openFileDialog: async () => {
+      const result = await ipc.file.pickFile();
+      if (!result.ok || result.data === null) return;
+      await useFileStore.getState().openFile(result.data);
+    },
+
+    saveActiveBuffer: async () => {
+      const { activeTabId } = useFileStore.getState();
+      if (!activeTabId) return false;
+
+      const buffer = useEditorStore.getState().buffers.get(activeTabId);
+      if (!buffer) return false;
+
+      const writeResult = await ipc.file.write(activeTabId, buffer.content);
+      if (!writeResult.ok) {
+        toast.error(`Failed to save: ${writeResult.error.message}`);
+        return false;
+      }
+
+      useEditorStore.getState().markSaved(activeTabId);
+      useFileStore.getState().markTabClean(activeTabId);
+      const title = useFileStore.getState().openTabs.find(t => t.id === activeTabId)?.title ?? activeTabId.split('/').pop() ?? activeTabId;
+      toast.success(`Saved ${title}`);
+      return true;
+    },
+  })),
+    {
+      name: 'mc-file-store',
+      storage: createJSONStorage(() => localStorage),
+      // Only persist the folder path; tree, expanded Set, and openTabs are
+      // rebuilt on demand. The app re-opens the folder on startup.
+      partialize: (state) => ({ rootPath: state.rootPath }),
+    }
+  )
+);
@@ -0,0 +1,25 @@
+import { create } from 'zustand';
+
+interface PreviewState {
+  source: string;
+  scrollRatio: number;
+  setSource: (s: string) => void;
+  setScrollRatio: (r: number) => void;
+}
+
+const DEBOUNCE_MS = 300;
+let timer: ReturnType<typeof setTimeout> | null = null;
+let pending: string = '';
+
+export const usePreviewStore = create<PreviewState>((set) => ({
+  source: '',
+  scrollRatio: 0,
+  setSource: (s) => {
+    pending = s;
+    if (timer) clearTimeout(timer);
+    timer = setTimeout(() => {
+      set({ source: pending });
+    }, DEBOUNCE_MS);
+  },
+  setScrollRatio: (r) => set({ scrollRatio: r }),
+}));
@@ -0,0 +1,38 @@
+import { create } from 'zustand';
+import { persist, createJSONStorage } from 'zustand/middleware';
+import { settingsSchema, type Settings } from '@/lib/validators';
+
+type SettingsLeaf = keyof Omit<Settings, never>;
+
+interface SettingsState extends Settings {
+  setSetting: <K extends SettingsLeaf>(key: K, value: Settings[K]) => void;
+  resetToDefaults: () => void;
+}
+
+const DEFAULTS = settingsSchema.parse({});
+
+export const useSettingsStore = create<SettingsState>()(
+  persist(
+    (set) => ({
+      ...DEFAULTS,
+      setSetting: (key, value) => set((s) => ({ ...s, [key]: value }) as Partial<SettingsState>),
+      resetToDefaults: () => set(() => ({ ...DEFAULTS })),
+    }),
+    {
+      name: 'mc-settings-store',
+      storage: createJSONStorage(() => localStorage),
+      partialize: (state) => {
+        const { setSetting, resetToDefaults, ...rest } = state;
+        return rest;
+      },
+      onRehydrateStorage: () => (state) => {
+        if (!state) return;
+        const result = settingsSchema.safeParse(state);
+        if (!result.success) {
+          console.warn('[settings-store] invalid persisted state, resetting to defaults', result.error);
+          useSettingsStore.setState({ ...DEFAULTS } as any);
+        }
+      },
+    }
+  )
+);
@@ -10,3 +10,48 @@ declare global {
 if (typeof window !== 'undefined' && !window.electronAPI) {
  window.electronAPI = {};
 }
+
+// Mock matchMedia for next-themes (jsdom doesn't have it)
+if (typeof window !== 'undefined') {
+  Object.defineProperty(window, 'matchMedia', {
+    writable: true,
+    value: (query: string) => ({
+      matches: false,
+      media: query,
+      onchange: null,
+      addListener: () => {},
+      removeListener: () => {},
+      addEventListener: () => {},
+      removeEventListener: () => {},
+      dispatchEvent: () => true,
+    }),
+  });
+}
+
+// Mock react-resizable-panels for jsdom environment
+if (typeof window !== 'undefined') {
+  Object.defineProperty(window, 'innerWidth', { writable: true, value: 1920 });
+  Object.defineProperty(window, 'innerHeight', { writable: true, value: 1080 });
+}
+
+// Polyfill ResizeObserver for @radix-ui/react-use-size
+if (typeof window !== 'undefined' && !window.ResizeObserver) {
+  class ResizeObserver {
+    observe() {}
+    unobserve() {}
+    disconnect() {}
+  }
+  window.ResizeObserver = ResizeObserver;
+}
+
+// Polyfill hasPointerCapture for @radix-ui/react-select (jsdom doesn't implement it)
+if (typeof window !== 'undefined' && !Element.prototype.hasPointerCapture) {
+  Element.prototype.hasPointerCapture = function () {
+    return false;
+  };
+}
+
+// Polyfill scrollIntoView for @radix-ui/react-select (jsdom doesn't implement it)
+if (typeof window !== 'undefined' && !Element.prototype.scrollIntoView) {
+  Element.prototype.scrollIntoView = function () {};
+}
@@ -0,0 +1,38 @@
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import { ThemeProvider } from '@/components/theme-provider';
+import { EditorPane } from '@/components/editor/EditorPane';
+import { useEditorStore } from '@/stores/editor-store';
+import { CodeMirrorEditor } from '@/components/editor/CodeMirrorEditor';
+
+vi.mock('@/components/editor/CodeMirrorEditor', () => ({
+  CodeMirrorEditor: ({ initialContent }: { initialContent: string }) => (
+    <div data-testid="codemirror-mock">{initialContent}</div>
+  ),
+}));
+
+describe('EditorPane', () => {
+  beforeEach(() => {
+    useEditorStore.setState({ buffers: new Map(), activeId: null });
+  });
+
+  it('renders the empty state when no buffer is open', () => {
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <EditorPane />
+      </ThemeProvider>
+    );
+    expect(screen.getByText(/no file open/i)).toBeInTheDocument();
+  });
+
+  it('renders the editor when a buffer is open', () => {
+    useEditorStore.getState().openBuffer('b1', '/x.md', '# hello');
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <EditorPane />
+      </ThemeProvider>
+    );
+    expect(screen.getByTestId('codemirror-mock')).toBeInTheDocument();
+    expect(screen.getByTestId('codemirror-mock')).toHaveTextContent('# hello');
+  });
+});
@@ -0,0 +1,93 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { ThemeProvider } from '@/components/theme-provider';
+import { AppHeader } from '@/components/layout/AppHeader';
+import { useAppStore } from '@/stores/app-store';
+import { useCommandStore } from '@/stores/command-store';
+
+describe('AppHeader', () => {
+  beforeEach(() => {
+    localStorage.clear();
+    useAppStore.setState({ sidebarVisible: true, previewVisible: true, zenMode: false });
+    useCommandStore.setState({ handlers: {} });
+    // Mirror what AppShell registers so dispatching actually does something.
+    useCommandStore.getState().register('view.toggleSidebar', () => {
+      useAppStore.getState().toggleSidebar();
+    });
+    useCommandStore.getState().register('view.togglePreview', () => {
+      useAppStore.getState().togglePreview();
+    });
+    useCommandStore.getState().register('shortcuts.show', () => {});
+    useCommandStore.getState().register('settings.open', () => {
+      useAppStore.getState().openModal('settings');
+    });
+    useCommandStore.getState().register('help.about', () => {
+      useAppStore.getState().openModal('about');
+    });
+  });
+
+  it('renders the app title', () => {
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <AppHeader />
+      </ThemeProvider>
+    );
+    expect(screen.getByText(/markdownconverter/i)).toBeInTheDocument();
+  });
+
+  it('toggles sidebar when sidebar button clicked', async () => {
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <AppHeader />
+      </ThemeProvider>
+    );
+    const btn = screen.getByRole('button', { name: /toggle sidebar/i });
+    await userEvent.click(btn);
+    expect(useAppStore.getState().sidebarVisible).toBe(false);
+  });
+
+  it('toggles preview when preview button clicked', async () => {
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <AppHeader />
+      </ThemeProvider>
+    );
+    const btn = screen.getByRole('button', { name: /toggle preview/i });
+    await userEvent.click(btn);
+    expect(useAppStore.getState().previewVisible).toBe(false);
+  });
+
+  it('disables-shortcut button dispatches shortcuts.show', async () => {
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <AppHeader />
+      </ThemeProvider>
+    );
+    const btn = screen.getByTestId('header-shortcuts');
+    await userEvent.click(btn);
+    // No observable side effect; the command was registered as a no-op.
+    // The test passes if no error is thrown and the click is processed.
+    expect(btn).toBeInTheDocument();
+  });
+
+  it('settings button opens settings modal', async () => {
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <AppHeader />
+      </ThemeProvider>
+    );
+    await userEvent.click(screen.getByRole('button', { name: /settings/i }));
+    expect(useAppStore.getState().modal).toEqual({ kind: 'settings' });
+  });
+
+  it('about button opens about modal', async () => {
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <AppHeader />
+      </ThemeProvider>
+    );
+    await userEvent.click(screen.getByRole('button', { name: /^about$/i }));
+    expect(useAppStore.getState().modal).toEqual({ kind: 'about' });
+  });
+});
@@ -0,0 +1,49 @@
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import { ThemeProvider } from '@/components/theme-provider';
+import { AppShell } from '@/components/layout/AppShell';
+import { useAppStore } from '@/stores/app-store';
+
+// Mock react-resizable-panels for jsdom environment
+vi.mock('@/components/ui/resizable', () => ({
+  ResizablePanelGroup: ({ children, direction, onLayout }: any) => (
+    <div data-testid="resizable-panel-group" data-direction={direction}>
+      {children}
+    </div>
+  ),
+  ResizablePanel: ({ children, defaultSize, minSize, maxSize }: any) => (
+    <div data-testid="resizable-panel" data-size={defaultSize} data-min={minSize} data-max={maxSize}>
+      {children}
+    </div>
+  ),
+  ResizableHandle: () => <div data-testid="resizable-handle" />,
+}));
+
+describe('AppShell', () => {
+  beforeEach(() => {
+    localStorage.clear();
+    useAppStore.setState({ sidebarVisible: true, previewVisible: true, zenMode: false });
+  });
+
+  it('renders all shell surfaces when sidebar and preview are visible', () => {
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <AppShell />
+      </ThemeProvider>
+    );
+    expect(screen.getByText(/markdownconverter/i)).toBeInTheDocument();
+    expect(screen.getByText(/no files open/i)).toBeInTheDocument();
+    expect(screen.getByText(/no file selected/i)).toBeInTheDocument();
+    expect(screen.getByText(/0 words/i)).toBeInTheDocument();
+  });
+
+  it('hides sidebar when sidebarVisible is false', () => {
+    useAppStore.setState({ sidebarVisible: false });
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <AppShell />
+      </ThemeProvider>
+    );
+    expect(screen.queryByText(/file tree placeholder/i)).not.toBeInTheDocument();
+  });
+});
@@ -0,0 +1,10 @@
+import { describe, it, expect } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import { StatusBar } from '@/components/layout/StatusBar';
+
+describe('StatusBar', () => {
+  it('renders zero word count when no file is open', () => {
+    render(<StatusBar />);
+    expect(screen.getByText(/0 words/i)).toBeInTheDocument();
+  });
+});
@@ -0,0 +1,116 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import { render, screen, act } from '@testing-library/react';
+import { TabBar } from '@/components/layout/TabBar';
+import { useFileStore } from '@/stores/file-store';
+
+describe('TabBar', () => {
+  beforeEach(() => {
+    useFileStore.setState({ openTabs: [], activeTabId: null });
+  });
+
+  it('renders "No files open" when openTabs is empty', () => {
+    render(<TabBar />);
+    expect(screen.getByText(/no files open/i)).toBeInTheDocument();
+  });
+
+  it('renders a tab for each OpenTab', () => {
+    useFileStore.setState({
+      openTabs: [
+        { id: '/tmp/foo.md', path: '/tmp/foo.md', title: 'foo.md', dirty: false },
+        { id: '/tmp/bar.md', path: '/tmp/bar.md', title: 'bar.md', dirty: false },
+      ],
+      activeTabId: '/tmp/foo.md',
+    });
+    render(<TabBar />);
+    expect(screen.getByText('foo.md')).toBeInTheDocument();
+    expect(screen.getByText('bar.md')).toBeInTheDocument();
+  });
+
+  it('highlights the active tab with aria-current', () => {
+    useFileStore.setState({
+      openTabs: [
+        { id: '/tmp/foo.md', path: '/tmp/foo.md', title: 'foo.md', dirty: false },
+        { id: '/tmp/bar.md', path: '/tmp/bar.md', title: 'bar.md', dirty: false },
+      ],
+      activeTabId: '/tmp/foo.md',
+    });
+    render(<TabBar />);
+    const fooTab = screen.getByText('foo.md').closest('[role="tab"]');
+    expect(fooTab).toHaveAttribute('aria-current', 'page');
+    const barTab = screen.getByText('bar.md').closest('[role="tab"]');
+    expect(barTab).not.toHaveAttribute('aria-current');
+  });
+
+  it('clicking a tab calls setActiveTab', async () => {
+    useFileStore.setState({
+      openTabs: [
+        { id: '/tmp/foo.md', path: '/tmp/foo.md', title: 'foo.md', dirty: false },
+        { id: '/tmp/bar.md', path: '/tmp/bar.md', title: 'bar.md', dirty: false },
+      ],
+      activeTabId: '/tmp/foo.md',
+    });
+    render(<TabBar />);
+    await act(async () => {
+      screen.getByText('bar.md').closest('[role="tab"]')!.click();
+    });
+    expect(useFileStore.getState().activeTabId).toBe('/tmp/bar.md');
+  });
+
+  it('clicking the close button calls closeTab and does not call setActiveTab separately', async () => {
+    // Use a non-active tab to test that closeTab doesn't change activeTabId
+    useFileStore.setState({
+      openTabs: [
+        { id: '/tmp/foo.md', path: '/tmp/foo.md', title: 'foo.md', dirty: false },
+        { id: '/tmp/bar.md', path: '/tmp/bar.md', title: 'bar.md', dirty: false },
+      ],
+      activeTabId: '/tmp/bar.md',
+    });
+    render(<TabBar />);
+
+    const fooTab = screen.getByText('foo.md');
+    const closeBtn = fooTab.closest('[role="tab"]')!.querySelector('button')!;
+    await act(async () => {
+      closeBtn.click();
+    });
+
+    const state = useFileStore.getState();
+    expect(state.openTabs.find((t) => t.id === '/tmp/foo.md')).toBeUndefined();
+    // activeTabId stays on bar since we closed a non-active tab
+    expect(state.activeTabId).toBe('/tmp/bar.md');
+  });
+
+  it('renders a dirty indicator when dirty === true', () => {
+    useFileStore.setState({
+      openTabs: [
+        { id: '/tmp/foo.md', path: '/tmp/foo.md', title: 'foo.md', dirty: true },
+      ],
+      activeTabId: '/tmp/foo.md',
+    });
+    render(<TabBar />);
+    const dirtyDot = screen.getByLabelText('Unsaved changes');
+    expect(dirtyDot).toBeInTheDocument();
+  });
+
+  it('reorders tabs when reorderTabs is called (drag end handler integration)', () => {
+    useFileStore.setState({
+      openTabs: [
+        { id: '/tmp/a.md', path: '/tmp/a.md', title: 'a.md', dirty: false },
+        { id: '/tmp/b.md', path: '/tmp/b.md', title: 'b.md', dirty: false },
+        { id: '/tmp/c.md', path: '/tmp/c.md', title: 'c.md', dirty: false },
+      ],
+      activeTabId: '/tmp/a.md',
+    });
+    render(<TabBar />);
+    // Initial DOM order
+    const initialOrder = screen.getAllByRole('tab').map((el) => el.getAttribute('data-testid'));
+    expect(initialOrder).toEqual(['tab-/tmp/a.md', 'tab-/tmp/b.md', 'tab-/tmp/c.md']);
+
+    // Simulate what dnd-kit's onDragEnd would do: move a.md (idx 0) to idx 2
+    act(() => {
+      useFileStore.getState().reorderTabs(0, 2);
+    });
+
+    const newOrder = screen.getAllByRole('tab').map((el) => el.getAttribute('data-testid'));
+    expect(newOrder).toEqual(['tab-/tmp/b.md', 'tab-/tmp/c.md', 'tab-/tmp/a.md']);
+  });
+});
@@ -0,0 +1,98 @@
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+import { render, screen, fireEvent, act } from '@testing-library/react';
+import { Toolbar } from '@/components/layout/Toolbar';
+import { useCommandStore } from '@/stores/command-store';
+import { useAppStore } from '@/stores/app-store';
+
+describe('Toolbar', () => {
+  beforeEach(() => {
+    useCommandStore.setState({ handlers: {} });
+    useAppStore.setState({
+      sidebarVisible: true,
+      previewVisible: true,
+      zenMode: false,
+      paneSizes: { sidebar: 20, editor: 50, preview: 30 },
+    });
+  });
+
+  it('renders formatting buttons', () => {
+    render(<Toolbar />);
+    expect(screen.getByRole('button', { name: /bold/i })).toBeInTheDocument();
+    expect(screen.getByRole('button', { name: /italic/i })).toBeInTheDocument();
+  });
+
+  it('renders all toolbar buttons', () => {
+    render(<Toolbar />);
+    expect(screen.getByTestId('toolbar-open-file')).toBeInTheDocument();
+    expect(screen.getByTestId('toolbar-open-folder')).toBeInTheDocument();
+    expect(screen.getByTestId('toolbar-save')).toBeInTheDocument();
+    expect(screen.getByTestId('toolbar-toggle-sidebar')).toBeInTheDocument();
+    expect(screen.getByTestId('toolbar-toggle-preview')).toBeInTheDocument();
+  });
+
+  it('Open file button dispatches file.open', () => {
+    const handler = vi.fn();
+    useCommandStore.getState().register('file.open', handler);
+    render(<Toolbar />);
+    fireEvent.click(screen.getByTestId('toolbar-open-file'));
+    expect(handler).toHaveBeenCalledTimes(1);
+  });
+
+  it('Open folder button dispatches file.openFolder', () => {
+    const handler = vi.fn();
+    useCommandStore.getState().register('file.openFolder', handler);
+    render(<Toolbar />);
+    fireEvent.click(screen.getByTestId('toolbar-open-folder'));
+    expect(handler).toHaveBeenCalledTimes(1);
+  });
+
+  it('Save button dispatches file.save', () => {
+    const handler = vi.fn();
+    useCommandStore.getState().register('file.save', handler);
+    render(<Toolbar />);
+    fireEvent.click(screen.getByTestId('toolbar-save'));
+    expect(handler).toHaveBeenCalledTimes(1);
+  });
+
+  it('Toggle sidebar button dispatches view.toggleSidebar and reflects aria-pressed', () => {
+    const handler = vi.fn();
+    useCommandStore.getState().register('view.toggleSidebar', handler);
+    render(<Toolbar />);
+    const btn = screen.getByTestId('toolbar-toggle-sidebar');
+    expect(btn).toHaveAttribute('aria-pressed', 'true');
+    fireEvent.click(btn);
+    expect(handler).toHaveBeenCalledTimes(1);
+  });
+
+  it('Toggle preview button dispatches view.togglePreview', () => {
+    const handler = vi.fn();
+    useCommandStore.getState().register('view.togglePreview', handler);
+    render(<Toolbar />);
+    fireEvent.click(screen.getByTestId('toolbar-toggle-preview'));
+    expect(handler).toHaveBeenCalledTimes(1);
+  });
+
+  it('toggle sidebar end-to-end: command flips appStore state, aria-pressed reflects it', () => {
+    useCommandStore.getState().register('view.toggleSidebar', () => {
+      useAppStore.getState().toggleSidebar();
+    });
+    render(<Toolbar />);
+    const btn = screen.getByTestId('toolbar-toggle-sidebar');
+    expect(btn).toHaveAttribute('aria-pressed', 'true');
+    act(() => {
+      fireEvent.click(btn);
+    });
+    expect(useAppStore.getState().sidebarVisible).toBe(false);
+    expect(btn).toHaveAttribute('aria-pressed', 'false');
+  });
+
+  it('formatting buttons (bold, italic, etc.) are disabled (Phase 9 work)', () => {
+    render(<Toolbar />);
+    expect(screen.getByLabelText('Bold')).toBeDisabled();
+    expect(screen.getByLabelText('Italic')).toBeDisabled();
+    expect(screen.getByLabelText('Unordered list')).toBeDisabled();
+    expect(screen.getByLabelText('Ordered list')).toBeDisabled();
+    expect(screen.getByLabelText('Code')).toBeDisabled();
+    expect(screen.getByLabelText('Link')).toBeDisabled();
+  });
+});
@@ -0,0 +1,34 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { AboutDialog } from '@/components/modals/AboutDialog';
+import { useAppStore } from '@/stores/app-store';
+
+describe('AboutDialog', () => {
+  beforeEach(() => {
+    window.electronAPI = {
+      app: {
+        getVersion: vi.fn().mockResolvedValue('5.0.0'),
+        openExternal: vi.fn().mockResolvedValue({ ok: true }),
+      },
+    } as any;
+    // Reset store to about modal so dialog renders
+    useAppStore.setState({ modal: { kind: 'about' } } as any);
+  });
+
+  it('renders title and version', async () => {
+    render(<AboutDialog />);
+    expect(screen.getByText(/about markdownconverter/i)).toBeInTheDocument();
+    expect(await screen.findByText(/5\.0\.0/)).toBeInTheDocument();
+  });
+
+  it('closes when the close button is clicked', async () => {
+    render(<AboutDialog />);
+    // dialog-footer has the visible Close button; the X button also has sr-only "Close"
+    const closeButtons = await screen.findAllByRole('button', { name: /close/i });
+    const close = closeButtons[0];
+    await userEvent.click(close);
+    // closeModal sets modal.kind = null, so isOpen=false, Dialog unmounts
+    expect(screen.queryByRole('dialog')).not.toBeInTheDocument();
+  });
+});
@@ -0,0 +1,43 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { ConfirmDialog } from '@/components/modals/ConfirmDialog';
+import { useAppStore } from '@/stores/app-store';
+
+describe('ConfirmDialog', () => {
+  beforeEach(() => {
+    localStorage.clear();
+    useAppStore.setState({ modal: { kind: null } } as any);
+  });
+
+  it('renders title, body, and confirm/cancel labels', () => {
+    render(
+      <ConfirmDialog
+        title="Delete file?"
+        body="This cannot be undone."
+        confirmLabel="Delete"
+        onConfirm={() => {}}
+      />
+    );
+    expect(screen.getByText(/delete file/i)).toBeInTheDocument();
+    expect(screen.getByText(/cannot be undone/i)).toBeInTheDocument();
+    expect(screen.getByRole('button', { name: /^delete$/i })).toBeInTheDocument();
+    expect(screen.getByRole('button', { name: /cancel/i })).toBeInTheDocument();
+  });
+
+  it('calls onConfirm and closes on confirm click', async () => {
+    const onConfirm = vi.fn();
+    render(<ConfirmDialog title="T" body="B" onConfirm={onConfirm} />);
+    await userEvent.click(screen.getByRole('button', { name: /confirm/i }));
+    expect(onConfirm).toHaveBeenCalledTimes(1);
+    expect(useAppStore.getState().modal).toEqual({ kind: null });
+  });
+
+  it('destructive variant uses destructive button class', () => {
+    render(
+      <ConfirmDialog title="T" body="B" destructive onConfirm={() => {}} />
+    );
+    const btn = screen.getByRole('button', { name: /confirm/i });
+    expect(btn.className).toContain('bg-destructive');
+  });
+});
@@ -0,0 +1,29 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { ExportBatchDialog } from '@/components/modals/ExportBatchDialog';
+
+describe('ExportBatchDialog', () => {
+  beforeEach(() => {
+    localStorage.clear();
+    window.electronAPI = {
+      export: { batch: vi.fn().mockResolvedValue({ ok: true, data: { total: 2, succeeded: 2, failed: 0, results: [] } }) },
+    } as any;
+  });
+
+  it('renders the file list passed via sourcePaths', () => {
+    render(<ExportBatchDialog sourcePaths={['/a.md', '/b.md']} />);
+    expect(screen.getByText('/a.md')).toBeInTheDocument();
+    expect(screen.getByText('/b.md')).toBeInTheDocument();
+  });
+
+  it('selecting format and concurrency submits correct options', async () => {
+    render(<ExportBatchDialog sourcePaths={['/a.md', '/b.md']} />);
+    await userEvent.click(screen.getByRole('combobox', { name: /format/i }));
+    await userEvent.click(screen.getByRole('option', { name: /^pdf$/i }));
+    await userEvent.click(screen.getByRole('button', { name: /^export$/i }));
+    const call = (window.electronAPI.export.batch as any).mock.calls[0];
+    expect(call[0]).toEqual([{ inputPath: '/a.md', outputPath: expect.any(String) }, { inputPath: '/b.md', outputPath: expect.any(String) }]);
+    expect(call[1].format).toBe('pdf');
+  });
+});
@@ -0,0 +1,41 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { ExportDocxDialog } from '@/components/modals/ExportDocxDialog';
+import { useFileStore } from '@/stores/file-store';
+import { useEditorStore } from '@/stores/editor-store';
+import { useSettingsStore } from '@/stores/settings-store';
+
+describe('ExportDocxDialog', () => {
+  beforeEach(() => {
+    localStorage.clear();
+    window.electronAPI = {
+      export: { docx: vi.fn().mockResolvedValue({ ok: true, data: { outputPath: '/out.docx' } }) },
+    } as any;
+    useSettingsStore.setState(useSettingsStore.getInitialState());
+    useFileStore.setState({ activeTabId: '/test.md', openTabs: [{ id: '/test.md', path: '/test.md', title: 'test.md', dirty: false }] } as any);
+    useEditorStore.setState({ buffers: new Map([['/test.md', { id: '/test.md', path: '/test.md', content: '# hi', dirty: false }]]) } as any);
+  });
+
+  it('renders with standard template selected by default', () => {
+    render(<ExportDocxDialog sourcePath="/test.md" />);
+    expect(screen.getByText(/export to docx/i)).toBeInTheDocument();
+    expect(screen.getByRole('combobox', { name: /template/i })).toBeInTheDocument();
+  });
+
+  it('submitting with default options sends template=standard', async () => {
+    render(<ExportDocxDialog sourcePath="/test.md" />);
+    await userEvent.click(screen.getByRole('button', { name: /^export$/i }));
+    const call = (window.electronAPI.export.docx as any).mock.calls[0][0];
+    expect(call.template).toBe('standard');
+  });
+
+  it('selecting "modern" template sends template=modern', async () => {
+    render(<ExportDocxDialog sourcePath="/test.md" />);
+    await userEvent.click(screen.getByRole('combobox', { name: /template/i }));
+    await userEvent.click(screen.getByRole('option', { name: /modern/i }));
+    await userEvent.click(screen.getByRole('button', { name: /^export$/i }));
+    const call = (window.electronAPI.export.docx as any).mock.calls[0][0];
+    expect(call.template).toBe('modern');
+  });
+});
@@ -0,0 +1,35 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { ExportHtmlDialog } from '@/components/modals/ExportHtmlDialog';
+import { useFileStore } from '@/stores/file-store';
+import { useEditorStore } from '@/stores/editor-store';
+import { useSettingsStore } from '@/stores/settings-store';
+
+describe('ExportHtmlDialog', () => {
+  beforeEach(() => {
+    localStorage.clear();
+    window.electronAPI = {
+      export: { html: vi.fn().mockResolvedValue({ ok: true, data: { outputPath: '/out.html' } }) },
+    } as any;
+    useSettingsStore.setState(useSettingsStore.getInitialState());
+    useFileStore.setState({ activeTabId: '/test.md', openTabs: [{ id: '/test.md', path: '/test.md', title: 'test.md', dirty: false }] } as any);
+    useEditorStore.setState({ buffers: new Map([['/test.md', { id: '/test.md', path: '/test.md', content: '# hi', dirty: false }]]) } as any);
+  });
+
+  it('renders with default github highlight style', () => {
+    render(<ExportHtmlDialog sourcePath="/test.md" />);
+    expect(screen.getByText(/export to html/i)).toBeInTheDocument();
+  });
+
+  it('toggles standalone and submits with chosen highlight', async () => {
+    render(<ExportHtmlDialog sourcePath="/test.md" />);
+    await userEvent.click(screen.getByRole('checkbox', { name: /standalone/i }));
+    await userEvent.click(screen.getByRole('combobox', { name: /highlight/i }));
+    await userEvent.click(screen.getByRole('option', { name: /monokai/i }));
+    await userEvent.click(screen.getByRole('button', { name: /^export$/i }));
+    const call = (window.electronAPI.export.html as any).mock.calls[0][0];
+    expect(call.standalone).toBe(false);
+    expect(call.highlightStyle).toBe('monokai');
+  });
+});
@@ -0,0 +1,43 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { ExportPdfDialog } from '@/components/modals/ExportPdfDialog';
+import { useFileStore } from '@/stores/file-store';
+import { useEditorStore } from '@/stores/editor-store';
+import { useSettingsStore } from '@/stores/settings-store';
+
+describe('ExportPdfDialog', () => {
+  beforeEach(() => {
+    localStorage.clear();
+    window.electronAPI = {
+      export: {
+        pdf: vi.fn().mockResolvedValue({ ok: true, data: { outputPath: '/out.pdf', bytes: 1024, durationMs: 100 } }),
+      },
+    } as any;
+    useSettingsStore.setState(useSettingsStore.getInitialState());
+    useFileStore.setState({ activeTabId: '/test.md', openTabs: [{ id: '/test.md', path: '/test.md', title: 'test.md', dirty: false }] } as any);
+    useEditorStore.setState({ buffers: new Map([['/test.md', { id: '/test.md', path: '/test.md', content: '# hi', dirty: false }]]) } as any);
+  });
+
+  it('renders with default PDF options from settings', () => {
+    render(<ExportPdfDialog sourcePath="/test.md" />);
+    expect(screen.getByText(/export to pdf/i)).toBeInTheDocument();
+    expect(screen.getByRole('combobox', { name: /format/i })).toBeInTheDocument();
+  });
+
+  it('toggles ASCII tables and submits merged options', async () => {
+    render(<ExportPdfDialog sourcePath="/test.md" />);
+    await userEvent.click(screen.getByRole('checkbox', { name: /ascii/i }));
+    await userEvent.click(screen.getByRole('button', { name: /^export$/i }));
+    const call = (window.electronAPI.export.pdf as any).mock.calls[0][0];
+    expect(call.renderTablesAsAscii).toBe(true);
+    expect(call.format).toBe('a4');
+  });
+
+  it('renders an error banner when IPC fails', async () => {
+    (window.electronAPI.export.pdf as any).mockRejectedValueOnce(new Error('Pandoc not found'));
+    render(<ExportPdfDialog sourcePath="/test.md" />);
+    await userEvent.click(screen.getByRole('button', { name: /^export$/i }));
+    expect(await screen.findByText(/pandoc not found/i)).toBeInTheDocument();
+  });
+});
@@ -0,0 +1,32 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import { ModalLayer } from '@/components/modals/ModalLayer';
+import { useAppStore } from '@/stores/app-store';
+
+describe('ModalLayer', () => {
+  beforeEach(() => {
+    localStorage.clear();
+    useAppStore.setState({ modal: { kind: null } } as any);
+  });
+
+  it('renders nothing when modal is null', () => {
+    const { container } = render(<ModalLayer />);
+    expect(container.firstChild).toBeNull();
+  });
+
+  it('renders AboutDialog when kind is "about"', () => {
+    useAppStore.getState().openModal('about');
+    render(<ModalLayer />);
+    expect(screen.getByRole('dialog')).toBeInTheDocument();
+  });
+
+  it('switches from about to settings when modal kind changes', () => {
+    useAppStore.getState().openModal('about');
+    const { rerender } = render(<ModalLayer />);
+    expect(screen.getByText(/about markdownconverter/i)).toBeInTheDocument();
+    useAppStore.getState().openModal('settings');
+    rerender(<ModalLayer />);
+    expect(screen.queryByText(/about markdownconverter/i)).not.toBeInTheDocument();
+    expect(screen.getByText(/settings/i)).toBeInTheDocument();
+  });
+});
@@ -0,0 +1,58 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { SettingsSheet } from '@/components/modals/SettingsSheet';
+import { useSettingsStore } from '@/stores/settings-store';
+
+describe('SettingsSheet', () => {
+  beforeEach(() => {
+    localStorage.clear();
+    useSettingsStore.setState(useSettingsStore.getInitialState());
+  });
+
+  it('renders 5 tab triggers', () => {
+    render(<SettingsSheet />);
+    expect(screen.getByRole('tab', { name: /editor/i })).toBeInTheDocument();
+    expect(screen.getByRole('tab', { name: /theme/i })).toBeInTheDocument();
+    expect(screen.getByRole('tab', { name: /export/i })).toBeInTheDocument();
+    expect(screen.getByRole('tab', { name: /plugins/i })).toBeInTheDocument();
+    expect(screen.getByRole('tab', { name: /about/i })).toBeInTheDocument();
+  });
+
+  it('editor tab is open by default and shows font size', () => {
+    render(<SettingsSheet />);
+    expect(screen.getByText(/font size/i)).toBeInTheDocument();
+  });
+
+  it('theme tab shows theme radio group', async () => {
+    render(<SettingsSheet />);
+    await userEvent.click(screen.getByRole('tab', { name: /theme/i }));
+    expect(screen.getByText(/accent color/i)).toBeInTheDocument();
+  });
+
+  it('export tab shows ascii toggle and template picker', async () => {
+    render(<SettingsSheet />);
+    await userEvent.click(screen.getByRole('tab', { name: /export/i }));
+    expect(screen.getByText(/render tables as ascii by default/i)).toBeInTheDocument();
+    expect(screen.getByText(/default docx template/i)).toBeInTheDocument();
+  });
+
+  it('plugins tab shows coming soon message', async () => {
+    render(<SettingsSheet />);
+    await userEvent.click(screen.getByRole('tab', { name: /plugins/i }));
+    expect(screen.getByText(/coming soon/i)).toBeInTheDocument();
+  });
+
+  it('about tab shows version', async () => {
+    render(<SettingsSheet />);
+    await userEvent.click(screen.getByRole('tab', { name: /about/i }));
+    expect(screen.getByText(/markdownconverter/i)).toBeInTheDocument();
+  });
+
+  it('reset to defaults button clears all settings', async () => {
+    useSettingsStore.getState().setSetting('fontSize', 22);
+    render(<SettingsSheet />);
+    await userEvent.click(screen.getByRole('button', { name: /reset/i }));
+    expect(useSettingsStore.getState().fontSize).toBe(14);
+  });
+});
@@ -0,0 +1,34 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { WelcomeDialog } from '@/components/modals/WelcomeDialog';
+import { useSettingsStore } from '@/stores/settings-store';
+import { useAppStore } from '@/stores/app-store';
+
+describe('WelcomeDialog', () => {
+  beforeEach(() => {
+    localStorage.clear();
+    useSettingsStore.setState(useSettingsStore.getInitialState());
+    useAppStore.setState({ modal: { kind: null } } as any);
+  });
+
+  it('renders a heading and quick-start content', () => {
+    render(<WelcomeDialog />);
+    expect(screen.getByRole('heading', { name: /welcome/i })).toBeInTheDocument();
+    expect(screen.getByText(/open a folder/i)).toBeInTheDocument();
+  });
+
+  it('closing without the checkbox does not dismiss future welcome dialogs', async () => {
+    render(<WelcomeDialog />);
+    await userEvent.click(screen.getByRole('button', { name: /get started/i }));
+    expect(useSettingsStore.getState().welcomeDismissed).toBe(false);
+    expect(useAppStore.getState().modal).toEqual({ kind: null });
+  });
+
+  it('checking "don\'t show again" persists the flag', async () => {
+    render(<WelcomeDialog />);
+    await userEvent.click(screen.getByRole('checkbox', { name: /don't show again/i }));
+    await userEvent.click(screen.getByRole('button', { name: /get started/i }));
+    expect(useSettingsStore.getState().welcomeDismissed).toBe(true);
+  });
+});
@@ -0,0 +1,28 @@
+import { describe, it, expect, vi } from 'vitest';
+import { render, screen, waitFor } from '@testing-library/react';
+import { MermaidLazy } from '@/components/preview/MermaidLazy';
+
+vi.mock('mermaid', () => ({
+  default: {
+    initialize: vi.fn(),
+    render: vi.fn().mockResolvedValue('<svg></svg>'),
+  },
+}));
+
+describe('MermaidLazy', () => {
+  it('renders an svg after mermaid resolves', async () => {
+    render(<MermaidLazy code="graph TD; A-->B" />);
+    await waitFor(() => {
+      expect(screen.getByTestId('mermaid-output').innerHTML).toContain('<svg');
+    });
+  });
+
+  it('shows an error message if mermaid throws', async () => {
+    const mermaid = (await import('mermaid')).default as any;
+    mermaid.render.mockRejectedValueOnce(new Error('mermaid failed'));
+    render(<MermaidLazy code="bad code" />);
+    await waitFor(() => {
+      expect(screen.getByText(/mermaid failed/i)).toBeInTheDocument();
+    });
+  });
+});
@@ -0,0 +1,30 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import { ThemeProvider } from '@/components/theme-provider';
+import { PreviewPane } from '@/components/preview/PreviewPane';
+import { usePreviewStore } from '@/stores/preview-store';
+
+describe('PreviewPane', () => {
+  beforeEach(() => {
+    usePreviewStore.setState({ scrollRatio: 0, source: '' });
+  });
+
+  it('renders empty state when no source', () => {
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <PreviewPane />
+      </ThemeProvider>
+    );
+    expect(screen.getByText(/nothing to preview/i)).toBeInTheDocument();
+  });
+
+  it('renders markdown when source is set', () => {
+    usePreviewStore.setState({ source: '# Hello' });
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <PreviewPane />
+      </ThemeProvider>
+    );
+    expect(screen.getByRole('heading', { level: 1, name: /hello/i })).toBeInTheDocument();
+  });
+});
@@ -0,0 +1,111 @@
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import { ThemeProvider } from '@/components/theme-provider';
+import { FileTree } from '@/components/sidebar/FileTree';
+import { useFileStore } from '@/stores/file-store';
+
+vi.mock('@/lib/ipc', () => ({
+  ipc: {
+    file: {
+      list: vi.fn().mockResolvedValue({ ok: true, data: [] }),
+      read: vi.fn().mockResolvedValue({ ok: true, data: '' }),
+    },
+  },
+}));
+
+describe('FileTree', () => {
+  beforeEach(() => {
+    useFileStore.setState({ tree: null, rootPath: null, expanded: new Set(), openTabs: [], activeTabId: null });
+  });
+
+  it('renders nothing when tree is null', () => {
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <FileTree />
+      </ThemeProvider>
+    );
+    expect(screen.queryByRole('button')).toBeNull();
+  });
+
+  it('renders root children after openFolder', async () => {
+    useFileStore.setState({
+      tree: {
+        name: 'project',
+        path: '/project',
+        isDirectory: true,
+        loaded: true,
+        children: [
+          { name: 'src', path: '/project/src', isDirectory: true, children: null, loaded: false },
+          { name: 'README.md', path: '/project/README.md', isDirectory: false, children: null },
+        ],
+      },
+      rootPath: '/project',
+    });
+
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <FileTree />
+      </ThemeProvider>
+    );
+
+    expect(screen.getByText('src')).toBeInTheDocument();
+    expect(screen.getByText('README.md')).toBeInTheDocument();
+  });
+
+  it('shows folder as expanded after toggle and reveals children', async () => {
+    useFileStore.setState({
+      tree: {
+        name: 'project',
+        path: '/project',
+        isDirectory: true,
+        loaded: true,
+        children: [
+          {
+            name: 'src',
+            path: '/project/src',
+            isDirectory: true,
+            loaded: true,
+            children: [
+              { name: 'index.ts', path: '/project/src/index.ts', isDirectory: false, children: null },
+            ],
+          },
+        ],
+      },
+      rootPath: '/project',
+      expanded: new Set(['/project/src']),
+    });
+
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <FileTree />
+      </ThemeProvider>
+    );
+
+    expect(screen.getByText('index.ts')).toBeInTheDocument();
+  });
+
+  it('highlights the active tab path', () => {
+    useFileStore.setState({
+      tree: {
+        name: 'project',
+        path: '/project',
+        isDirectory: true,
+        loaded: true,
+        children: [
+          { name: 'README.md', path: '/project/README.md', isDirectory: false, children: null },
+        ],
+      },
+      rootPath: '/project',
+      activeTabId: '/project/README.md',
+    });
+
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <FileTree />
+      </ThemeProvider>
+    );
+
+    const btn = screen.getByRole('button', { name: /README.md/i });
+    expect(btn).toHaveClass('bg-accent');
+  });
+});
@@ -0,0 +1,75 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import { ThemeProvider } from '@/components/theme-provider';
+import { Outline } from '@/components/sidebar/Outline';
+import { useEditorStore } from '@/stores/editor-store';
+
+describe('Outline', () => {
+  beforeEach(() => {
+    useEditorStore.setState({ buffers: new Map(), activeId: null });
+  });
+
+  it('renders "No file open" when no active buffer', () => {
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <Outline />
+      </ThemeProvider>
+    );
+    expect(screen.getByText(/no file open/i)).toBeInTheDocument();
+  });
+
+  it('renders H1-H6 headings from the active buffer content', () => {
+    const buffers = new Map([
+      [
+        'b1',
+        {
+          id: 'b1',
+          path: '/x.md',
+          content: '# Hello\n## World\n### Foo\n#### Bar\n##### Baz\n###### Qux',
+          dirty: false,
+        },
+      ],
+    ]);
+    useEditorStore.setState({ buffers, activeId: 'b1' });
+
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <Outline />
+      </ThemeProvider>
+    );
+
+    expect(screen.getByText('Hello')).toBeInTheDocument();
+    expect(screen.getByText('World')).toBeInTheDocument();
+    expect(screen.getByText('Foo')).toBeInTheDocument();
+    expect(screen.getByText('Bar')).toBeInTheDocument();
+    expect(screen.getByText('Baz')).toBeInTheDocument();
+    expect(screen.getByText('Qux')).toBeInTheDocument();
+  });
+
+  it('renders headings with level-based indent', () => {
+    const buffers = new Map([
+      [
+        'b1',
+        {
+          id: 'b1',
+          path: '/x.md',
+          content: '# Title\n## Subtitle\n### Section',
+          dirty: false,
+        },
+      ],
+    ]);
+    useEditorStore.setState({ buffers, activeId: 'b1' });
+
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <Outline />
+      </ThemeProvider>
+    );
+
+    const buttons = screen.getAllByRole('button');
+    // H1 has paddingLeft 8px, H2 has24px, H3 has 40px
+    expect(buttons[0]).toHaveStyle('padding-left: 8px');
+    expect(buttons[1]).toHaveStyle('padding-left: 24px');
+    expect(buttons[2]).toHaveStyle('padding-left: 40px');
+  });
+});
@@ -0,0 +1,92 @@
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+import { render, screen, fireEvent } from '@testing-library/react';
+import { ThemeProvider } from '@/components/theme-provider';
+import { Sidebar } from '@/components/sidebar/Sidebar';
+import { useFileStore } from '@/stores/file-store';
+import { useEditorStore } from '@/stores/editor-store';
+
+vi.mock('@/lib/ipc', () => ({
+  ipc: {
+    file: {
+      pickFolder: vi.fn(),
+      list: vi.fn(),
+      pickFile: vi.fn(),
+      read: vi.fn(),
+      write: vi.fn(),
+    },
+  },
+}));
+
+describe('Sidebar', () => {
+  beforeEach(() => {
+    useFileStore.setState({ tree: null, rootPath: null, expanded: new Set(), openTabs: [], activeTabId: null });
+    useEditorStore.setState({ buffers: new Map(), activeId: null });
+  });
+
+  it('renders without crashing with empty state in both sections', () => {
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <Sidebar />
+      </ThemeProvider>
+    );
+    expect(screen.getByText('Files')).toBeInTheDocument();
+    expect(screen.getByText('Outline')).toBeInTheDocument();
+    expect(screen.getByText(/no folder opened/i)).toBeInTheDocument();
+    expect(screen.getByText(/no file open/i)).toBeInTheDocument();
+  });
+
+  it('renders FileTree and Outline sections', () => {
+    useFileStore.setState({
+      tree: {
+        name: 'project',
+        path: '/project',
+        isDirectory: true,
+        loaded: true,
+        children: [{ name: 'README.md', path: '/project/README.md', isDirectory: false, children: null }],
+      },
+      rootPath: '/project',
+    });
+
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <Sidebar />
+      </ThemeProvider>
+    );
+
+    expect(screen.getByText('Files')).toBeInTheDocument();
+    expect(screen.getByText('Outline')).toBeInTheDocument();
+    expect(screen.getByText('README.md')).toBeInTheDocument();
+  });
+
+  it('renders "Open Folder" button when no folder is open', () => {
+    useFileStore.setState({ tree: null, rootPath: null });
+
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <Sidebar />
+      </ThemeProvider>
+    );
+
+    expect(screen.getByText(/no folder opened/i)).toBeInTheDocument();
+    const btn = screen.getByRole('button', { name: /open folder/i });
+    expect(btn).toBeInTheDocument();
+  });
+
+  it('clicking "Open Folder" button calls openFolderDialog', async () => {
+    const { ipc } = await import('@/lib/ipc');
+    const spy = vi.spyOn(useFileStore.getState(), 'openFolderDialog');
+
+    useFileStore.setState({ tree: null, rootPath: null });
+
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <Sidebar />
+      </ThemeProvider>
+    );
+
+    const btn = screen.getByRole('button', { name: /open folder/i });
+    fireEvent.click(btn);
+
+    expect(spy).toHaveBeenCalled();
+  });
+});
@@ -0,0 +1,13 @@
+import { describe, it, expect, vi } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { Checkbox } from '@/components/ui/checkbox';
+
+describe('Checkbox', () => {
+  it('toggles checked state on click', async () => {
+    const onCheckedChange = vi.fn();
+    render(<Checkbox aria-label="agree" onCheckedChange={onCheckedChange} />);
+    await userEvent.click(screen.getByRole('checkbox', { name: /agree/i }));
+    expect(onCheckedChange).toHaveBeenCalledWith(true);
+  });
+});
@@ -0,0 +1,30 @@
+import { describe, it, expect } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogHeader,
+  DialogTitle,
+  DialogTrigger,
+} from '@/components/ui/dialog';
+
+describe('Dialog', () => {
+  it('opens on trigger click and shows content', async () => {
+    render(
+      <Dialog>
+        <DialogTrigger>Open</DialogTrigger>
+        <DialogContent aria-describedby="d">
+          <DialogHeader>
+            <DialogTitle>Title</DialogTitle>
+            <DialogDescription id="d">Desc</DialogDescription>
+          </DialogHeader>
+        </DialogContent>
+      </Dialog>
+    );
+    await userEvent.click(screen.getByRole('button', { name: /open/i }));
+    expect(screen.getByRole('dialog')).toBeInTheDocument();
+    expect(screen.getByText(/title/i)).toBeInTheDocument();
+  });
+});
@@ -0,0 +1,42 @@
+import { describe, it, expect } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import { useForm, FormProvider } from 'react-hook-form';
+import { z } from 'zod';
+import { zodResolver } from '@hookform/resolvers/zod';
+import { Form, FormField, FormItem, FormLabel, FormControl, FormMessage } from '@/components/ui/form';
+import { Input } from '@/components/ui/input';
+
+const schema = z.object({ name: z.string().min(2) });
+
+function Harness() {
+  const form = useForm<{ name: string }>({
+    resolver: zodResolver(schema),
+    defaultValues: { name: '' },
+  });
+  return (
+    <FormProvider {...form}>
+      <Form>
+        <FormField
+          control={form.control}
+          name="name"
+          render={({ field }) => (
+            <FormItem>
+              <FormLabel>Name</FormLabel>
+              <FormControl>
+                <Input {...field} aria-label="name" />
+              </FormControl>
+              <FormMessage />
+            </FormItem>
+          )}
+        />
+      </Form>
+    </FormProvider>
+  );
+}
+
+describe('Form', () => {
+  it('renders a labeled form field', () => {
+    render(<Harness />);
+    expect(screen.getByLabelText(/name/i)).toBeInTheDocument();
+  });
+});
@@ -0,0 +1,14 @@
+import { describe, it, expect, vi } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { Input } from '@/components/ui/input';
+
+describe('Input', () => {
+  it('renders and accepts typing', async () => {
+    const onChange = vi.fn();
+    render(<Input aria-label="name" onChange={onChange} />);
+    const input = screen.getByLabelText(/name/i);
+    await userEvent.type(input, 'a');
+    expect(onChange).toHaveBeenCalled();
+  });
+});
@@ -0,0 +1,17 @@
+import { describe, it, expect } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import { Label } from '@/components/ui/label';
+
+describe('Label', () => {
+  it('renders children and associates with a control', () => {
+    render(
+      <>
+        <Label htmlFor="x">Username</Label>
+        <input id="x" />
+      </>
+    );
+    const label = screen.getByText(/username/i);
+    expect(label).toBeInTheDocument();
+    expect(label.tagName).toBe('LABEL');
+  });
+});
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
amitwh	24c6675c82	fix(test): use mockRejectedValue for IPC error in ExportPdfDialog test	2026-06-05 23:17:57 +05:30
amitwh	929d72cf1d	test(renderer): Phase 8 toasts integration smoke test	2026-06-05 23:12:26 +05:30
amitwh	b40bff641c	feat(renderer): export dialogs toast on success/failure	2026-06-05 23:05:32 +05:30
amitwh	338669f2db	feat(renderer): file-store toasts on save/open/folder	2026-06-05 22:59:54 +05:30
amitwh	54615649f4	feat(renderer): mount Toaster in App.tsx	2026-06-05 22:52:04 +05:30
amitwh	3ff76c8c33	feat(renderer): add shadcn Toaster primitive	2026-06-05 22:50:07 +05:30
amitwh	8160ac05e0	feat(renderer): lib/toast.ts typed wrappers over sonner	2026-06-05 22:46:45 +05:30
amitwh	6762b5f9af	docs(spec): Phase 8 toasts design — typed helpers, Toaster mount, 4 wire points	2026-06-05 22:41:28 +05:30
amitwh	00485d1bef	feat(renderer): implement numeric right-alignment in ascii-table Adds the actual right-alignment heuristic to toAsciiTable (was missing from initial implementation). When any column header starts with a digit, all columns are right-padded instead of left-padded. Matches the test added in `53870d5` which exercises the right-alignment path with header ['Item', '7']. All 6 ascii-table tests pass.	2026-06-05 22:18:15 +05:30
amitwh	24bb9aa9f5	test(renderer): Phase 7 modals integration smoke test	2026-06-05 19:54:35 +05:30
amitwh	b39bdcf475	feat(renderer): mount ModalLayer + first-launch welcome trigger	2026-06-05 19:48:37 +05:30
amitwh	9d154a8521	feat(renderer): AppHeader gets Settings + About icon buttons	2026-06-05 19:46:56 +05:30
amitwh	fe62c8814c	feat(renderer): register 9 modal-opening commands in command store	2026-06-05 19:44:13 +05:30
amitwh	9306a9c23b	feat(renderer): SettingsSheet (5 tabs: editor, theme, export, plugins, about)	2026-06-05 19:41:18 +05:30
amitwh	88e26c130e	feat(renderer): AboutSettings tab (version + links)	2026-06-05 19:39:01 +05:30
amitwh	b02707ac7f	feat(renderer): PluginsSettings tab placeholder (Coming soon)	2026-06-05 19:37:54 +05:30
amitwh	ebc149ff0b	feat(renderer): ExportSettings tab (PDF/DOCX/HTML defaults + ascii toggle)	2026-06-05 19:35:28 +05:30
amitwh	be3af42fc5	feat(renderer): ThemeSettings tab (mode, accent, font)	2026-06-05 19:32:43 +05:30
amitwh	ed611c77ed	feat(renderer): EditorSettings tab (font, tab, line/wrap, minimap)	2026-06-05 19:31:18 +05:30
amitwh	f25d856a2a	feat(renderer): ExportBatchDialog (format, concurrency, file list)	2026-06-05 19:30:15 +05:30
amitwh	76fed872ce	test(renderer): assert toggled standalone value in ExportHtmlDialog test	2026-06-05 19:28:44 +05:30
amitwh	9de14df016	feat(renderer): ExportHtmlDialog (standalone, highlight style, ascii tables)	2026-06-05 19:27:16 +05:30
amitwh	5f0b4c9c4e	feat(renderer): ExportDocxDialog (template picker + ascii tables)	2026-06-05 19:23:40 +05:30
amitwh	7d083a024d	feat(renderer): ExportPdfDialog (format, margins, ascii tables)	2026-06-05 19:19:18 +05:30
amitwh	68fcaf9bfc	feat(renderer): ExportDialogFooter (shared cancel/export row)	2026-06-05 19:11:27 +05:30
amitwh	a2a44fbf2c	feat(renderer): useExportSource hook (shared by export dialogs)	2026-06-05 19:09:55 +05:30
amitwh	026a4d9fac	feat(renderer): WelcomeDialog (first-launch quick-start)	2026-06-05 19:07:14 +05:30
amitwh	a461b62dd3	feat(renderer): ConfirmDialog (generic title/body/onConfirm)	2026-06-05 19:01:06 +05:30
amitwh	1cd316caf1	feat(renderer): AboutDialog (version + GitHub link)	2026-06-05 18:47:14 +05:30
amitwh	2bdb380130	feat(renderer): ModalLayer shell (dispatches to 7 modal types)	2026-06-05 18:36:28 +05:30
amitwh	41942a1316	feat(renderer): useSettingsStore (persisted, validated, reset-able)	2026-06-05 18:31:27 +05:30
amitwh	9ad484744a	feat(renderer): useAppStore extended with modal discriminated union	2026-06-05 18:28:02 +05:30
amitwh	d0a26126cc	feat(renderer): zod validators for settings + export schemas	2026-06-05 18:25:13 +05:30
amitwh	53870d58bb	test(renderer): clarify ascii-table alignment tests (left vs right)	2026-06-05 18:23:48 +05:30
amitwh	00d6802422	feat(renderer): ascii-table helper for export-time table formatting	2026-06-05 18:20:23 +05:30
amitwh	02418b943e	feat(renderer): add shadcn form primitive (react-hook-form glue)	2026-06-05 18:03:26 +05:30
amitwh	8b2809ebaf	fix(renderer): export SheetPortal and SheetOverlay from sheet primitive	2026-06-05 17:55:21 +05:30
amitwh	8f5eb301b6	feat(renderer): add shadcn sheet primitive	2026-06-05 17:53:08 +05:30
amitwh	8f9dab1405	feat(renderer): add shadcn dialog primitive	2026-06-05 17:49:31 +05:30
amitwh	a6fa14124d	feat(renderer): add shadcn tabs primitive	2026-06-05 17:42:21 +05:30
amitwh	0538aec02c	feat(renderer): add shadcn select primitive	2026-06-05 17:35:45 +05:30
amitwh	1d782a00e6	feat(renderer): add shadcn radio-group primitive	2026-06-05 17:26:29 +05:30
amitwh	9eb1fe0f00	test(renderer): add ResizeObserver polyfill to test setup (required for slider/shadcn components)	2026-06-05 17:23:59 +05:30
amitwh	3344b2aea9	feat(renderer): add shadcn slider primitive	2026-06-05 17:23:13 +05:30
amitwh	6b23e5ef60	feat(renderer): add shadcn switch primitive	2026-06-05 17:18:19 +05:30
amitwh	221598c91b	feat(renderer): add shadcn checkbox primitive	2026-06-05 17:13:49 +05:30
amitwh	d8ee743fb1	feat(renderer): add shadcn textarea primitive	2026-06-05 17:09:59 +05:30
amitwh	66e2b56221	feat(renderer): add shadcn input primitive	2026-06-05 17:06:36 +05:30
amitwh	d22d616727	feat(renderer): add shadcn label primitive	2026-06-05 17:03:10 +05:30
amitwh	89590a349a	docs(plan): Phase 7 modals implementation plan (37 tasks, TDD, ~+50 tests)	2026-06-05 16:54:07 +05:30
amitwh	f447896a63	docs(spec): Phase 7 modals design — settings store, ModalLayer, 7 modal types, ASCII tables	2026-06-05 16:27:25 +05:30
Amit Haridas	ccb998be66	test(renderer): Phase 6 integration smoke test (menu -> command -> store) - 7 end-to-end tests covering toolbar, header, native menu IPC, userBindings persistence, and command registry - 169/169 tests pass (was 105 at end of Phase 5) - build succeeds	2026-06-05 16:03:46 +05:30
Amit Haridas	813582aa8d	feat(renderer): command store persists userBindings (Phase 6) - add userBindings map (commandId -> combo string) - setUserBinding / clearUserBinding / getUserBinding actions - persist middleware with partialize: handlers are runtime-only, userBindings are serialized - TDD: 7 persistence tests + existing 10 command-store tests still pass - 162/162 total tests pass	2026-06-05 16:02:26 +05:30
Amit Haridas	b1e16af62d	feat(renderer): AppHeader wired to command store - toggle sidebar/preview buttons dispatch through command store - new 'shortcuts.show' command (Keyboard icon, opens shortcuts panel later) - AppHeader.test.tsx updated: registers matching commands in beforeEach - integration test fixed: 'Open folder' button now matches 2 (toolbar + sidebar) - 155/155 tests pass	2026-06-05 16:00:58 +05:30
Amit Haridas	487ce2ad45	feat(renderer): Toolbar wired to command store - 5 functional buttons: Open file, Open folder, Save, Toggle sidebar, Toggle preview - each dispatches via useCommandStore - aria-pressed on toggle buttons reflects app store state - formatting buttons (bold, italic, etc.) stay disabled (Phase 9) - toolbar now has role='toolbar' and aria-label - TDD: 9 component tests	2026-06-05 15:58:21 +05:30
Amit Haridas	1717b2e8c0	feat(renderer): register menu commands in AppShell (Phase 6 wiring) - useRegisterMenuCommands: registers file.open, file.save, file.closeTab, tab.next, tab.prev, view.toggleSidebar, view.togglePreview in command store - useBridgeNativeMenu: useMenuAction for 13 native-menu channels (file-save, toggle-preview, load-template-menu, etc.) - AppShell calls both on mount - integration test mock extended to include ipc.menu.on - 145/145 tests pass (was 105)	2026-06-05 15:56:32 +05:30
Amit Haridas	cdd370c62d	feat(renderer): useMenuAction hook (native menu IPC -> command store) - bridge between main-process menu events and the command dispatcher - optional transform: convert raw IPC payload to command args - extends ipc.ts with ipc.menu.on() helper - TDD: 5 unit tests covering subscription, payload transform, no-op, unmount	2026-06-05 15:53:37 +05:30
Amit Haridas	6df21ace35	feat(renderer): useShortcut hook (generic key combo binding) - 'mod+s' / 'mod+shift+s' / 'Tab' / etc. - mod = meta (Mac) or ctrl (others) - suppresses when <input>/<textarea>/contentEditable focused - preventDefault on match - TDD: 15 unit tests covering parser, match, suppression, unmount	2026-06-05 15:51:35 +05:30
Amit Haridas	c93747c476	feat(renderer): command store (action registry for menu/shortcut/toolbar) - useCommandStore: register/unregister/registerMany/dispatch/get - keyed by id (e.g. 'file.open', 'view.toggleSidebar') - TDD: 10 unit tests covering register, dispatch, unregister, batch - foundation for Phase 6 native menu + toolbar wiring	2026-06-05 15:49:45 +05:30
amitwh	d865b181e9	test(renderer): phase 5 integration smoke test	2026-06-05 15:39:36 +05:30
amitwh	5e5bab3da9	feat(renderer): persist last-opened folder (mc-file-store) + restore on mount	2026-06-05 15:36:59 +05:30
amitwh	ce2bf62d42	feat(renderer): drag-to-reorder tabs (dnd-kit)	2026-06-05 15:34:25 +05:30
amitwh	6da98c3a54	feat(renderer): keyboard shortcuts for file ops (open, save, close, next/prev tab)	2026-06-05 15:32:55 +05:30
amitwh	3598d06240	feat(preload): add file.list, file.pickFolder, file.pickFile convenience methods	2026-06-05 15:13:16 +05:30
amitwh	650c266945	feat(renderer): TabBar wired to file store (dirty dot, close, active highlight) - Renders tabs from useFileStore.openTabs with title + dirty dot + close button - Uses Zustand selectors for granular re-renders - Active tab highlighted with aria-current and accent background - Close button stops propagation; does not trigger tab activation - Horizontal scroll on overflow, h-9 fixed bar with border - Empty state preserved when no tabs open Tests: 6 cases (empty, render, highlight, click-switch, click-close, dirty indicator) - 75 total tests (was 70, gained 5 new) - All pass - Build: succeeds Amit Haridas	2026-06-05 15:03:01 +05:30
amitwh	05bbb9f86b	feat(renderer): Sidebar, FileTree, Outline components wired into AppShell	2026-06-05 14:59:15 +05:30
amitwh	77c8e05fa5	feat(renderer): shadcn collapsible, scroll-area, context-menu primitives	2026-06-05 14:54:31 +05:30
amitwh	17f318dd75	fix(renderer): drop redundant ternary, add loadChildren idempotence test	2026-06-05 14:50:56 +05:30
amitwh	fa5a46d5ac	feat(renderer): file store with FileNode tree, openTabs, lazy loadChildren	2026-06-05 14:42:08 +05:30
amitwh	a4201acad9	feat(renderer): wire PreviewPane into AppShell	2026-06-05 13:15:47 +05:30
amitwh	0b5af04a6a	feat(renderer): PreviewPane tracks scroll ratio	2026-06-05 13:14:50 +05:30
amitwh	2d6f909b0e	feat(renderer): useScrollSync hook (60fps throttling, ratio calc)	2026-06-05 13:13:37 +05:30
amitwh	8624257c1f	feat(renderer): editor buffer content feeds preview store (300ms debounce)	2026-06-05 13:09:34 +05:30
amitwh	b75f436aaa	feat(renderer): PreviewPane with empty state and MarkdownRenderer	2026-06-05 13:07:55 +05:30
amitwh	d81d8c28d2	test(renderer): remove non-existent html property from preview-store reset	2026-06-05 13:07:06 +05:30
amitwh	559d09cad9	feat(renderer): preview store with 300ms debounced source	2026-06-05 13:04:39 +05:30
amitwh	5ad582ec3e	feat(renderer): MarkdownRenderer with mermaid code re-extraction from source	2026-06-05 13:03:32 +05:30
amitwh	d02f896167	feat(renderer): MermaidLazy (loads mermaid on first use, error UI)	2026-06-05 13:01:24 +05:30
amitwh	f34775ce53	feat(renderer): markdown lib (marked + DOMPurify + mermaid placeholders)	2026-06-05 12:56:31 +05:30
amitwh	5d6a55dd09	feat(renderer): StatusBar reads from editor store (word count, cursor pos)	2026-06-05 12:49:16 +05:30
amitwh	0e80e37d9d	feat(renderer): wire EditorPane into AppShell	2026-06-05 12:46:13 +05:30
amitwh	9a7e994224	feat(renderer): EditorPane with empty state and CodeMirror rendering	2026-06-05 12:42:25 +05:30
amitwh	3effacf816	feat(renderer): CodeMirror 6 editor wrapper with markdown, themes, keymaps	2026-06-05 12:38:09 +05:30
amitwh	1be10f9ae5	feat(renderer): CodeMirror light theme with brand-aware syntax colors	2026-06-05 12:25:31 +05:30
amitwh	4c0b7d6e84	feat(renderer): editor store with buffers, dirty state, cursor (immer)	2026-06-05 12:21:48 +05:30
amitwh	db04ea5854	feat(renderer): App.tsx renders AppShell	2026-06-05 12:11:01 +05:30
amitwh	567726022c	feat(renderer): AppShell with resizable panes, sidebar/preview toggle, persisted sizes	2026-06-05 12:02:35 +05:30
amitwh	1999a7716e	feat(renderer): StatusBar placeholder (word count wired in Phase 3)	2026-06-05 11:53:34 +05:30
amitwh	16e071ae5e	feat(renderer): Breadcrumb placeholder (wired in Phase 5)	2026-06-05 11:50:45 +05:30
amitwh	7ecf54ceb0	feat(renderer): Toolbar skeleton with formatting buttons	2026-06-05 11:48:26 +05:30
amitwh	95e2f45f1f	feat(renderer): TabBar skeleton (no tabs yet — wired in Phase 5)	2026-06-05 11:45:33 +05:30
amitwh	7fbbd60525	feat(renderer): AppHeader with sidebar/preview toggles + theme toggle	2026-06-05 11:40:54 +05:30
amitwh	c715bb354c	feat(renderer): install shadcn resizable primitive	2026-06-05 11:35:02 +05:30
amitwh	6525de7667	feat(renderer): add useAppStore with sidebar/preview/zen/pane-sizes	2026-06-05 11:30:25 +05:30