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/phase-3-widget-overlay.md

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+# Phase 3: Widget Edit Overlay
+
+**Status:** ⬜ Not Started
+**Parent plan:** [PLAN.md](./PLAN.md)
+**Domain:** frontend
+
+## Objective
+Add hover overlays to every widget when in edit mode, showing edit/delete/drag controls without obscuring the widget content.
+
+## Tasks
+
+- [ ] Create `src/lib/components/widget/WidgetEditOverlay.svelte`
+- [ ] Overlay appears on hover over a widget in edit mode
+- [ ] Controls: pencil icon (top-right), trash icon (top-right, secondary), drag handle (top-left)
+- [ ] Semi-transparent backdrop on hover (e.g., bg-black/5)
+- [ ] Pencil click emits `onEdit(widgetId)` event
+- [ ] Trash click shows inline confirmation ("Delete?" with Yes/No), then emits `onDelete(widgetId)`
+- [ ] Drag handle integrated with svelte-dnd-action (prepared for Phase 7)
+- [ ] Wrap each widget in WidgetEditOverlay in `WidgetGrid.svelte` when edit mode is active
+- [ ] Overlay transitions: fade in on hover, fade out on leave
+- [ ] Overlay does NOT block widget interaction when not hovered (pointer-events)
+
+## Files to Modify/Create
+- `src/lib/components/widget/WidgetEditOverlay.svelte` — new component
+- `src/lib/components/widget/WidgetGrid.svelte` — wrap widgets conditionally
+
+## Acceptance Criteria
+- Hovering over a widget in edit mode shows the overlay
+- Overlay has pencil, trash, and drag handle controls
+- Controls are clickable and emit correct events
+- Overlay does not appear when NOT in edit mode
+- Widget content remains visible through the overlay
+
+## Notes
+- Keep overlay minimal — don't overwhelm the widget visually
+- Trash confirmation should be inline (not a browser confirm dialog)
+- The actual edit panel opening (pencil) is Phase 4
+- The actual delete logic is Phase 8
+
+## Review Checklist
+- [ ] All tasks completed
+- [ ] Code follows project conventions
+- [ ] No unintended side effects
+- [ ] Build passes
+- [ ] Tests pass (new + existing)
+
+## Handoff to Next Phase
+<!-- Filled in after completing this phase -->