Phase 0.3: migrate date formatting to date-fns

frontend/src/pages/DmsTrash.tsx

@@ -8,6 +8,7 @@ import { useTranslation } from 'react-i18next';
 import { Link } from 'react-router-dom';
 import { Button } from '@/components/ui/Button';
 import { Card } from '@/components/ui/Card';
+import { formatDateShort } from '@/utils/date';
 import { Table, TableColumn } from '@/components/ui/Table';
 import { EmptyState } from '@/components/ui/EmptyState';
 import { Skeleton } from '@/components/ui/Skeleton';
@@ -79,7 +80,7 @@ export function DmsTrashPage() {
       sortable: true,
       accessor: (file) => file.deleted_at || '',
       render: (file) => file.deleted_at
-        ? new Date(file.deleted_at).toLocaleDateString()
+        ? (formatDateShort(file.deleted_at) || '—')
         : '—',
     },
     {