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- Fix sidebar: Notes nav no longer active on notebook pages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/note-card.tsx

@@ -115,6 +115,8 @@ interface NoteCardProps {
   onResize?: () => void
   onSizeChange?: (newSize: 'small' | 'medium' | 'large') => void
   isTrashView?: boolean
+  noteHistoryEnabled?: boolean
+  onOpenHistory?: (note: Note) => void
 }
 
 // Helper function to get initials from name
@@ -153,7 +155,9 @@ export const NoteCard = memo(function NoteCard({
   isDragging,
   onResize,
   onSizeChange,
-  isTrashView
+  isTrashView,
+  noteHistoryEnabled = false,
+  onOpenHistory,
 }: NoteCardProps) {
   const router = useRouter()
   const searchParams = useSearchParams()
@@ -610,7 +614,7 @@ export const NoteCard = memo(function NoteCard({
       {/* Footer with Date only */}
       <div className="mt-3 flex items-center justify-end">
         {/* Creation Date */}
-        <div className="text-xs text-muted-foreground">
+        <div className="text-xs text-muted-foreground" suppressHydrationWarning>
           {formatDistanceToNow(new Date(note.createdAt), { addSuffix: true, locale: getDateLocale(language) })}
         </div>
       </div>
@@ -645,6 +649,8 @@ export const NoteCard = memo(function NoteCard({
           isTrashView={isTrashView}
           onRestore={handleRestore}
           onPermanentDelete={handlePermanentDelete}
+          onOpenHistory={() => onOpenHistory?.(note)}
+          historyEnabled={noteHistoryEnabled}
           className="absolute bottom-0 left-0 right-0 p-2 opacity-100 md:opacity-0 group-hover:opacity-100 transition-opacity"
         />
       )}