feat: smart note history with manual/auto modes, delete entries, i18n fixes

- Add noteHistoryMode setting (manual default / auto) with DB migration
- Manual mode: commit button in editor toolbar creates snapshots on demand
- Auto mode: smart snapshots with 20-char diff threshold + 5min cooldown,
  structural changes (color, pin, archive, labels) bypass cooldown
- Add delete individual history entries from history modal
- Fix sidebar: Notes nav no longer active on notebook pages
- Fix sidebar icon: replace filled Lightbulb with outlined FileText
- Fix title suggestions: change from amber to sky blue color scheme
- Fix hydration mismatch: add suppressHydrationWarning on locale dates
- Complete i18n: add history, sort, and AI chat translations for all 16 languages
- Translate French AI assistant section (40+ keys) from English to French
- Update README with new features and stack info

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

memento-note/components/masonry-grid.tsx

@@ -39,6 +39,9 @@ interface MasonryGridProps {
   onEdit?: (note: Note, readOnly?: boolean) => void;
   onSizeChange?: (noteId: string, size: 'small' | 'medium' | 'large') => void;
   isTrashView?: boolean;
+  noteHistoryEnabled?: boolean;
+  noteHistoryMode?: 'manual' | 'auto';
+  onOpenHistory?: (note: Note) => void;
 }
 
 // ─────────────────────────────────────────────
@@ -53,6 +56,8 @@ interface SortableNoteProps {
   isDragging?: boolean;
   isOverlay?: boolean;
   isTrashView?: boolean;
+  noteHistoryEnabled?: boolean;
+  onOpenHistory?: (note: Note) => void;
 }
 
 const SortableNoteItem = memo(function SortableNoteItem({
@@ -64,6 +69,8 @@ const SortableNoteItem = memo(function SortableNoteItem({
   isDragging,
   isOverlay,
   isTrashView,
+  noteHistoryEnabled,
+  onOpenHistory,
 }: SortableNoteProps) {
   const {
     attributes,
@@ -98,6 +105,8 @@ const SortableNoteItem = memo(function SortableNoteItem({
         isDragging={isDragging}
         isTrashView={isTrashView}
         onSizeChange={(newSize) => onSizeChange(note.id, newSize)}
+        noteHistoryEnabled={noteHistoryEnabled}
+        onOpenHistory={onOpenHistory}
       />
     </div>
   );
@@ -114,6 +123,8 @@ interface SortableGridSectionProps {
   onDragStartNote: (noteId: string) => void;
   onDragEndNote: () => void;
   isTrashView?: boolean;
+  noteHistoryEnabled?: boolean;
+  onOpenHistory?: (note: Note) => void;
 }
 
 const SortableGridSection = memo(function SortableGridSection({
@@ -124,6 +135,8 @@ const SortableGridSection = memo(function SortableGridSection({
   onDragStartNote,
   onDragEndNote,
   isTrashView,
+  noteHistoryEnabled,
+  onOpenHistory,
 }: SortableGridSectionProps) {
   const ids = useMemo(() => notes.map(n => n.id), [notes]);
 
@@ -140,6 +153,8 @@ const SortableGridSection = memo(function SortableGridSection({
             onDragEndNote={onDragEndNote}
             isDragging={draggedNoteId === note.id}
             isTrashView={isTrashView}
+            noteHistoryEnabled={noteHistoryEnabled}
+            onOpenHistory={onOpenHistory}
           />
         ))}
       </div>
@@ -150,7 +165,14 @@ const SortableGridSection = memo(function SortableGridSection({
 // ─────────────────────────────────────────────
 // Main MasonryGrid component
 // ─────────────────────────────────────────────
-export function MasonryGrid({ notes, onEdit, onSizeChange, isTrashView }: MasonryGridProps) {
+export function MasonryGrid({
+  notes,
+  onEdit,
+  onSizeChange,
+  isTrashView,
+  noteHistoryEnabled = false,
+  onOpenHistory,
+}: MasonryGridProps) {
   const { t } = useLanguage();
   const [editingNote, setEditingNote] = useState<{ note: Note; readOnly?: boolean } | null>(null);
   const { startDrag, endDrag, draggedNoteId } = useNotebookDrag();
@@ -261,6 +283,8 @@ export function MasonryGrid({ notes, onEdit, onSizeChange, isTrashView }: Masonr
               onDragStartNote={startDrag}
               onDragEndNote={endDrag}
               isTrashView={isTrashView}
+              noteHistoryEnabled={noteHistoryEnabled}
+              onOpenHistory={onOpenHistory}
             />
           </div>
         )}
@@ -280,6 +304,8 @@ export function MasonryGrid({ notes, onEdit, onSizeChange, isTrashView }: Masonr
               onDragStartNote={startDrag}
               onDragEndNote={endDrag}
               isTrashView={isTrashView}
+              noteHistoryEnabled={noteHistoryEnabled}
+              onOpenHistory={onOpenHistory}
             />
           </div>
         )}
@@ -294,6 +320,8 @@ export function MasonryGrid({ notes, onEdit, onSizeChange, isTrashView }: Masonr
               onEdit={handleEdit}
               isDragging={true}
               onSizeChange={(newSize) => handleSizeChange(activeNote.id, newSize)}
+              noteHistoryEnabled={noteHistoryEnabled}
+              onOpenHistory={onOpenHistory}
             />
           </div>
         ) : null}