修复用户端订单列表生命周期与刷新

apps/user_app/lib/ui/features/shared/record_list_page.dart

@@ -8,45 +8,66 @@ class RecordListPage extends StatefulWidget {
   const RecordListPage({
     required this.title,
     required this.eyebrow,
-    required this.viewModel,
+    required this.sourceKey,
+    required this.loader,
     this.description,
     this.floatingActionButton,
     this.onRecordTap,
     this.embedded = false,
+    this.refreshToken = 0,
     super.key,
   });
 
   final String title;
   final String eyebrow;
   final String? description;
-  final RecordListViewModel viewModel;
+  final String sourceKey;
+  final RecordLoader loader;
   final Widget? floatingActionButton;
   final ValueChanged<ClientRecord>? onRecordTap;
   final bool embedded;
+  final int refreshToken;
 
   @override
   State<RecordListPage> createState() => _RecordListPageState();
 }
 
-class _RecordListPageState extends State<RecordListPage> {
+class _RecordListPageState extends State<RecordListPage>
+    with AutomaticKeepAliveClientMixin<RecordListPage> {
+  late RecordListViewModel _viewModel;
+
   @override
   void initState() {
     super.initState();
-    widget.viewModel.load();
+    _viewModel = RecordListViewModel(widget.loader)..load();
+  }
+
+  @override
+  void didUpdateWidget(covariant RecordListPage oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    if (widget.sourceKey != oldWidget.sourceKey) {
+      _viewModel.dispose();
+      _viewModel = RecordListViewModel(widget.loader)..load();
+      return;
+    }
+    if (widget.refreshToken != oldWidget.refreshToken) {
+      _viewModel.load();
+    }
   }
 
   @override
   void dispose() {
-    widget.viewModel.dispose();
+    _viewModel.dispose();
     super.dispose();
   }
 
   @override
   Widget build(BuildContext context) {
+    super.build(context);
     final content = ListenableBuilder(
-      listenable: widget.viewModel,
+      listenable: _viewModel,
       builder: (context, _) {
-        final state = widget.viewModel;
+        final state = _viewModel;
         if (state.loading && state.records.isEmpty) {
           return const Center(child: CircularProgressIndicator());
         }
@@ -123,4 +144,7 @@ class _RecordListPageState extends State<RecordListPage> {
       body: content,
     );
   }
+
+  @override
+  bool get wantKeepAlive => true;
 }

apps/user_app/lib/ui/features/shared/record_list_view_model.dart

@@ -14,23 +14,46 @@ class RecordListViewModel extends ChangeNotifier {
   List<ClientRecord> _records = const [];
   Object? _error;
   bool _loading = false;
+  bool _disposed = false;
+  int _requestGeneration = 0;
 
   List<ClientRecord> get records => List.unmodifiable(_records);
   Object? get error => _error;
   bool get loading => _loading;
 
   Future<void> load() async {
+    final generation = ++_requestGeneration;
     _loading = true;
     _error = null;
-    notifyListeners();
+    _notifyIfActive();
     try {
-      _records = await _loader();
+      final records = await _loader();
+      if (!_isCurrent(generation)) return;
+      _records = records;
     } catch (error) {
+      if (!_isCurrent(generation)) return;
       // 会话失效由统一路由接管，不在列表中重复展示网络错误。
       if (error is! SessionExpiredException) _error = error;
     } finally {
-      _loading = false;
-      notifyListeners();
+      if (_isCurrent(generation)) {
+        _loading = false;
+        _notifyIfActive();
+      }
     }
   }
+
+  /// 仅允许最后一次请求且组件仍存活时写入状态。
+  bool _isCurrent(int generation) => !_disposed && generation == _requestGeneration;
+
+  /// 避免异步请求在页面销毁后继续通知监听器。
+  void _notifyIfActive() {
+    if (!_disposed) notifyListeners();
+  }
+
+  @override
+  void dispose() {
+    _disposed = true;
+    _requestGeneration += 1;
+    super.dispose();
+  }
 }