Add rejected mutation requeue flow in sync UI

lib/features/sync/sync_view.dart

@@ -172,6 +172,11 @@ class _SyncViewState extends ConsumerState<SyncView> {
                       'Rejected Changes',
                       style: Theme.of(context).textTheme.titleMedium,
                     ),
+                    TextButton.icon(
+                      onPressed: _busy ? null : _requeueRejected,
+                      icon: const Icon(Icons.replay_rounded),
+                      label: const Text('Requeue'),
+                    ),
                     TextButton.icon(
                       onPressed: _busy ? null : _dismissRejections,
                       icon: const Icon(Icons.done_all_rounded),
@@ -183,7 +188,13 @@ class _SyncViewState extends ConsumerState<SyncView> {
                 ...state.lastRejected.map(
                   (MutationRejection rejection) => Padding(
                     padding: const EdgeInsets.only(bottom: 10),
-                    child: _rejectionTile(rejection),
+                    child: _rejectionTile(
+                      rejection,
+                      matched: _findRejectedChange(
+                        state.lastRejectedChanges,
+                        rejection.clientMutationId,
+                      ),
+                    ),
                   ),
                 ),
               ],
@@ -244,7 +255,10 @@ class _SyncViewState extends ConsumerState<SyncView> {
     );
   }
 
-  Widget _rejectionTile(MutationRejection rejection) {
+  Widget _rejectionTile(
+    MutationRejection rejection, {
+    required ChangeEnvelope? matched,
+  }) {
     return Container(
       width: double.infinity,
       padding: const EdgeInsets.all(12),
@@ -279,6 +293,13 @@ class _SyncViewState extends ConsumerState<SyncView> {
                   context,
                 ).textTheme.bodySmall?.copyWith(color: AppTheme.textSecondary),
               ),
+              if (matched != null)
+                Text(
+                  '${matched.entityType}:${matched.entityId}',
+                  style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                    color: AppTheme.textSecondary,
+                  ),
+                ),
             ],
           ),
           const SizedBox(height: 6),
@@ -291,6 +312,18 @@ class _SyncViewState extends ConsumerState<SyncView> {
     );
   }
 
+  ChangeEnvelope? _findRejectedChange(
+    List<ChangeEnvelope> changes,
+    String clientMutationId,
+  ) {
+    for (final ChangeEnvelope change in changes) {
+      if (change.clientMutationId == clientMutationId) {
+        return change;
+      }
+    }
+    return null;
+  }
+
   String _formatDateTime(DateTime? value) {
     if (value == null) {
       return 'never';
@@ -354,6 +387,27 @@ class _SyncViewState extends ConsumerState<SyncView> {
     }
   }
 
+  Future<void> _requeueRejected() async {
+    setState(() {
+      _busy = true;
+    });
+
+    try {
+      await ref
+          .read(syncQueueRepositoryProvider.notifier)
+          .requeueRejectedChanges();
+      setState(() {
+        _status = 'Requeued rejected changes. Sync again after local fixes.';
+      });
+    } finally {
+      if (mounted) {
+        setState(() {
+          _busy = false;
+        });
+      }
+    }
+  }
+
   Future<void> _run(
     Future<SyncRunResult> Function(SyncCoordinator coordinator) action,
   ) async {