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- Fix sidebar: Notes nav no longer active on notebook pages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/home-client.tsx

@@ -4,7 +4,7 @@ import { useState, useEffect, useCallback, useRef } from 'react'
 import { useSearchParams, useRouter } from 'next/navigation'
 import dynamic from 'next/dynamic'
 import { Note } from '@/lib/types'
-import { getAISettings } from '@/app/actions/ai-settings'
+import { updateAISettings } from '@/app/actions/ai-settings'
 import { getAllNotes, searchNotes } from '@/app/actions/notes'
 import { NoteInput } from '@/components/note-input'
 import { NotesMainSection, type NotesViewMode } from '@/components/notes-main-section'
@@ -24,6 +24,7 @@ import { cn } from '@/lib/utils'
 import { LabelFilter } from '@/components/label-filter'
 import { useLanguage } from '@/lib/i18n'
 import { useHomeView } from '@/context/home-view-context'
+import { NoteHistoryModal } from '@/components/note-history-modal'
 
 // Lazy-load heavy dialogs — uniquement chargés à la demande
 const NoteEditor = dynamic(
@@ -42,6 +43,8 @@ const AutoLabelSuggestionDialog = dynamic(
 type InitialSettings = {
   showRecentNotes: boolean
   notesViewMode: 'masonry' | 'tabs'
+  noteHistory: boolean
+  noteHistoryMode: 'manual' | 'auto'
 }
 
 interface HomeClientProps {
@@ -59,10 +62,14 @@ export function HomeClient({ initialNotes, initialSettings }: HomeClientProps) {
     initialNotes.filter(n => n.isPinned)
   )
   const [notesViewMode, setNotesViewMode] = useState<NotesViewMode>(initialSettings.notesViewMode)
+  const [noteHistoryEnabled, setNoteHistoryEnabled] = useState(initialSettings.noteHistory)
+  const [noteHistoryMode] = useState<'manual' | 'auto'>(initialSettings.noteHistoryMode)
   const [editingNote, setEditingNote] = useState<{ note: Note; readOnly?: boolean } | null>(null)
   const [isLoading, setIsLoading] = useState(false) // false by default — data is pre-loaded
   const [notebookSuggestion, setNotebookSuggestion] = useState<{ noteId: string; content: string } | null>(null)
   const [batchOrganizationOpen, setBatchOrganizationOpen] = useState(false)
+  const [historyOpen, setHistoryOpen] = useState(false)
+  const [historyNote, setHistoryNote] = useState<Note | null>(null)
   const { refreshKey, triggerRefresh } = useNoteRefresh()
   const { labels } = useLabels()
   const { setControls } = useHomeView()
@@ -133,6 +140,22 @@ export function HomeClient({ initialNotes, initialSettings }: HomeClientProps) {
     if (note) setEditingNote({ note, readOnly: false })
   }
 
+  const handleOpenHistory = useCallback((note: Note) => {
+    setHistoryNote(note)
+    setHistoryOpen(true)
+  }, [])
+
+  const handleEnableHistory = useCallback(async () => {
+    await updateAISettings({ noteHistory: true })
+    setNoteHistoryEnabled(true)
+  }, [])
+
+  const handleHistoryRestored = useCallback((restored: Note) => {
+    setNotes((prev) => prev.map((n) => (n.id === restored.id ? { ...n, ...restored } : n)))
+    setPinnedNotes((prev) => prev.map((n) => (n.id === restored.id ? { ...n, ...restored } : n)))
+    setEditingNote((prev) => (prev?.note.id === restored.id ? { ...prev, note: restored } : prev))
+  }, [])
+
   const handleSizeChange = useCallback((noteId: string, size: 'small' | 'medium' | 'large') => {
     setNotes(prev => prev.map(n => n.id === noteId ? { ...n, size } : n))
     setPinnedNotes(prev => prev.map(n => n.id === noteId ? { ...n, size } : n))
@@ -388,6 +411,10 @@ export function HomeClient({ initialNotes, initialSettings }: HomeClientProps) {
                 onEdit={(note, readOnly) => setEditingNote({ note, readOnly })}
                 onSizeChange={handleSizeChange}
                 currentNotebookId={searchParams.get('notebook')}
+                noteHistoryEnabled={noteHistoryEnabled}
+                noteHistoryMode={noteHistoryMode}
+                onOpenHistory={handleOpenHistory}
+                onEnableHistory={handleEnableHistory}
               />
             </div>
           )}
@@ -437,6 +464,15 @@ export function HomeClient({ initialNotes, initialSettings }: HomeClientProps) {
           onClose={() => setEditingNote(null)}
         />
       )}
+
+      <NoteHistoryModal
+        open={historyOpen}
+        onOpenChange={setHistoryOpen}
+        note={historyNote}
+        enabled={noteHistoryEnabled}
+        onEnableHistory={handleEnableHistory}
+        onRestored={handleHistoryRestored}
+      />
     </div>
   )
 }