feat: image AI titles (3 suggestions), describe-images action, pin/list fixes, i18n

- Add image description service + API route for AI-powered image analysis
- Image title generation returns 3 selectable suggestions via TitleSuggestions component
- Add "Describe images" action in AI assistant (individual + collective)
- Fix pin refresh propagation in card and tabs view
- Fix note creation refresh in tabs mode, pass all notes to tabs view
- Add RTL support (dir="auto") on note content elements
- Pass UI language dynamically to AI endpoints instead of hardcoded 'fr'
- Add 18 missing i18n keys in both en.json and fr.json
- Sparkles button on images for AI title generation (bottom-right, pulse animation)

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

memento-note/components/note-card.tsx

@@ -299,6 +299,7 @@ export const NoteCard = memo(function NoteCard({
     startTransition(async () => {
       addOptimisticNote({ isPinned: !note.isPinned })
       await togglePin(note.id, !note.isPinned)
+      triggerRefresh()
 
       if (!note.isPinned) {
         toast.success(t('notes.pinned') || 'Note pinned')
@@ -312,6 +313,7 @@ export const NoteCard = memo(function NoteCard({
     startTransition(async () => {
       addOptimisticNote({ isArchived: !note.isArchived })
       await toggleArchive(note.id, !note.isArchived)
+      triggerRefresh()
     })
   }
 
@@ -516,7 +518,7 @@ export const NoteCard = memo(function NoteCard({
 
       {/* Title */}
       {optimisticNote.title && (
-        <h3 className="text-lg font-heading font-semibold mb-2 pr-20 text-foreground leading-tight tracking-tight">
+        <h3 dir="auto" className="text-lg font-heading font-semibold mb-2 pr-20 text-foreground leading-tight tracking-tight">
           {optimisticNote.title}
         </h3>
       )}