refactor: date utils and all calls

src/components/settings/BackupSettingsPageClient.tsx

@@ -8,6 +8,7 @@ import { Card, CardHeader, CardContent } from '@/components/ui/Card';
 import { Input } from '@/components/ui/Input';
 import { Modal } from '@/components/ui/Modal';
 import { Header } from '@/components/ui/Header';
+import { formatDateForDisplay } from '@/lib/date-utils';
 import Link from 'next/link';
 
 interface BackupSettingsPageClientProps {
@@ -193,16 +194,8 @@ export default function BackupSettingsPageClient({ initialData }: BackupSettings
 
   const formatDate = (date: string | Date): string => {
     // Format cohérent serveur/client pour éviter les erreurs d'hydratation
-    const d = new Date(date);
-    return d.toLocaleDateString('fr-FR', {
-      day: '2-digit',
-      month: '2-digit', 
-      year: 'numeric',
-      hour: '2-digit',
-      minute: '2-digit',
-      second: '2-digit',
-      hour12: false
-    });
+    const d = typeof date === 'string' ? new Date(date) : date;
+    return formatDateForDisplay(d, 'DISPLAY_MEDIUM');
   };
 
   if (isLoading) {