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

src/lib/i18n/en.json

@@ -356,5 +356,48 @@
 	"app.quick_add_description": "Review the details below and save to add this app to your launcher.",
 	"app.quick_add_success": "App added successfully!",
 	"app.quick_add_view_apps": "View Apps",
-	"app.quick_add_close": "Close Window"
+	"app.quick_add_close": "Close Window",
+
+	"board.editing": "Editing",
+	"board.exit_edit": "Exit Edit Mode",
+	"board.settings": "Board Settings",
+	"board.add_section": "Add Section",
+	"board.section_title": "Section title...",
+	"board.no_sections_edit": "No sections yet. Click \"+\" below to add one.",
+	"board.discard_title": "Discard Changes",
+	"board.discard_confirm": "Are you sure you want to discard all unsaved changes?",
+	"board.delete_section_title": "Delete Section",
+	"board.delete_section_confirm": "Are you sure you want to delete this section and its {count} widgets?",
+	"board.try_inline_edit": "Try the new inline edit mode!",
+	"board.inline_edit_description": "Edit your board directly with live preview. Press Ctrl+E on the board page.",
+	"board.open_inline_edit": "Open Inline Edit",
+	"board.advanced": "Advanced",
+	"board.theme_hue": "Theme Hue",
+	"board.theme_saturation": "Saturation",
+	"board.background": "Background",
+	"board.card_size": "Card Size",
+	"board.custom_css": "Custom CSS",
+
+	"widget.add_widget": "Add Widget",
+	"widget.edit_widget": "Edit Widget",
+	"widget.select_type": "Select widget type",
+	"widget.search_type": "Search widget types...",
+	"widget.delete_title": "Delete Widget",
+	"widget.delete_confirm": "Are you sure you want to delete this widget? This action will take effect when you save.",
+	"widget.content": "Content",
+	"widget.format": "Format",
+	"widget.height": "Height",
+	"widget.apps": "Apps",
+	"widget.timezone": "Timezone",
+	"widget.style": "Style",
+	"widget.show_weather": "Show Weather",
+	"widget.app": "App",
+
+	"common.discard": "Discard",
+	"common.apply": "Apply",
+	"common.search": "Search...",
+	"common.clear": "Clear",
+	"common.label": "Label",
+	"common.no_results": "No results found",
+	"common.dismiss": "Dismiss"
 }