ci: enforce flutter/biome format checks and fix front lint violations

userfront/lib/features/dashboard/domain/dashboard_providers.dart

@@ -172,9 +172,7 @@ class AuthTimelineNotifier extends Notifier<AuthTimelineState> {
       state = state.copyWith(
         isLoading: false,
         isLoadingMore: false,
-        error: tr(
-          'msg.userfront.dashboard.timeline.load_error',
-        ),
+        error: tr('msg.userfront.dashboard.timeline.load_error'),
       );
     }
   }