feat: reminder button in list/tabs view, notifications show reminders, trash count live update

- Add reminder action to NoteActions (masonry view) and NoteMetaSidebar (tabs view)
- NotificationPanel now fetches and displays upcoming/overdue reminders alongside share requests
- Badge count includes overdue reminders; overdue items show mark-as-done toggle
- Sidebar trash count refreshes on NoteRefreshContext trigger (no more manual refresh)
- Add "Clear completed" button on reminders page with clearCompletedReminders action
- Add i18n keys for new features (en/fr)

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

memento-note/components/note-card.tsx

@@ -177,6 +177,24 @@ export const NoteCard = memo(function NoteCard({
   const [comparisonNotes, setComparisonNotes] = useState<string[] | null>(null)
   const [fusionNotes, setFusionNotes] = useState<Array<Partial<Note>>>([])
   const [showNotebookMenu, setShowNotebookMenu] = useState(false)
+  const [reminderDate, setReminderDate] = useState<Date | null>(note.reminder ? new Date(note.reminder) : null)
+
+  const handleUpdateReminder = async (noteId: string, reminder: Date | null) => {
+    startTransition(async () => {
+      try {
+        await updateNote(noteId, { reminder })
+        setReminderDate(reminder)
+        triggerRefresh()
+        if (reminder) {
+          toast.success(t('notes.reminderSet', { datetime: reminder.toLocaleString() }))
+        } else {
+          toast.info(t('reminder.removeReminder'))
+        }
+      } catch {
+        toast.error(t('general.error'))
+      }
+    })
+  }
 
   // Move note to a notebook
   const handleMoveToNotebook = async (notebookId: string | null) => {
@@ -653,6 +671,9 @@ export const NoteCard = memo(function NoteCard({
           onPermanentDelete={handlePermanentDelete}
           onOpenHistory={() => onOpenHistory?.(note)}
           historyEnabled={noteHistoryEnabled}
+          noteId={note.id}
+          currentReminder={reminderDate}
+          onUpdateReminder={handleUpdateReminder}
           className="absolute bottom-0 left-0 right-0 p-2 opacity-100 md:opacity-0 group-hover:opacity-100 transition-opacity"
         />
       )}