feat(inline-edit): add WYSIWYG inline dashboard editing mode

Replace the disconnected board edit page with inline editing directly
on the board view. Toggle with Ctrl+E or the Edit button. Features:

- Edit mode store with changeset accumulation and batch save
- Floating toolbar (save, discard, add section, board settings, exit)
- Widget hover overlays with edit/delete/drag controls
- Type-specific widget config panels for all 14 widget types
- Section inline editing (title, icon picker, delete)
- "+" buttons for adding widgets and sections inline
- Section-level drag-and-drop reordering via svelte-dnd-action
- Batch save API endpoint (single Prisma transaction)
- Board properties side panel with live theme/wallpaper preview
- Modal widget type picker with search filtering
- Icon picker component with visual grid and search
- Confirmation dialog modal for all destructive actions
- HTML format support for Note widget (in addition to markdown/text)
- Full i18n support (en + ru) for all new UI strings
- Legacy edit page banner linking to new inline mode

plans/inline-dashboard-editing/CONTEXT.md

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+# Feature Context: Inline Dashboard Editing
+
+## Configuration
+- **Development mode:** Automated
+- **Execution mode:** Direct
+- **Strategy:** Big Bang
+- **Build:** `npm run build`
+- **Test:** `npm run test`
+- **Lint:** `npm run lint`
+- **Dev server:** `npm run dev` (port: 5173)
+
+## Current State
+Starting fresh. The board view page (`/boards/[boardId]`) is read-only.
+The edit page (`/boards/[boardId]/edit`) is a separate form-based page.
+
+## Key Architecture Notes
+- SvelteKit 2 + Svelte 5 (runes: $state, $derived, $props)
+- Prisma ORM with SQLite
+- Tailwind CSS v4
+- `svelte-dnd-action` for drag-and-drop
+- `lucide-svelte` for icons
+- `bits-ui` for UI primitives
+- Widget configs stored as JSON strings in `Widget.config`
+- Each widget type has Zod validation in `src/lib/utils/validators.ts`
+- Existing form actions on edit page: ?/updateBoard, ?/addSection, ?/deleteSection, ?/updateSection, ?/addWidget, ?/deleteWidget
+- Board view components: Board.svelte → Section.svelte → WidgetGrid.svelte → WidgetRenderer.svelte → [TypeWidget].svelte
+
+## Temporary Workarounds
+(none yet)
+
+## Cross-Phase Dependencies
+- Phase 3 (widget overlay) depends on Phase 1 (edit mode state)
+- Phase 4 (config panels) depends on Phase 3 (overlay triggers)
+- Phase 6 (add widget) depends on Phase 4 (config panel infrastructure)
+- Phase 7 (DnD) depends on Phase 1 (edit mode gate)
+- Phase 8 (batch save) depends on Phases 1-7 (all accumulated changes)
+- Phase 9 (board properties) depends on Phase 2 (toolbar trigger)
+- Phase 10 (migration) depends on all previous phases
+
+## Deferred Work
+(none yet)
+
+## Failed Approaches
+(none yet)
+
+## Review Findings Log
+(none yet)
+
+## Phase Execution Log
+| Phase | Agent Used | Test Writer | Parallel | Notes |
+|-------|-----------|-------------|----------|-------|
+| — | — | — | — | — |
+
+## Environment & Runtime Notes
+- Windows 10, Git Bash
+- Node.js project with Vite dev server
+
+## Implementation Notes
+(none yet)