feat(5-03-05): integrate ExportPanel into admin dashboard

frontend/app/admin/page.tsx

@@ -9,6 +9,7 @@ import LdapManager from '@/components/admin/LdapManager';
 import AiManager from '@/components/admin/AiManager';
 import DatabaseManager from '@/components/admin/DatabaseManager';
 import CategoryManager from '@/components/admin/CategoryManager';
+import { ExportPanel } from '@/components/admin/ExportPanel';
 
 export default function AdminPage() {
   const admin = useAdmin();
@@ -110,6 +111,9 @@ export default function AdminPage() {
           isSavingPrompt={admin.isSavingPrompt}
           onUpdatePrompt={admin.handleUpdatePrompt}
         />
+
+        {/* Full Width: Export & Reports */}
+        <ExportPanel data-testid="admin-tab-exports" />
       </main>
     </PageShell>
   );