fix: resolve navigation-cache regressions and todo UX

apps/lib/features/todo/ui/screens/todo_detail_screen.dart

@@ -29,6 +29,7 @@ class _TodoDetailScreenState extends State<TodoDetailScreen> {
 
   TodoResponse? _todo;
   bool _isLoading = true;
+  bool _didMutate = false;
   String? _error;
 
   @override
@@ -122,7 +123,7 @@ class _TodoDetailScreenState extends State<TodoDetailScreen> {
   Widget _buildHeader() {
     return BackTitlePageHeader(
       title: '待办详情',
-      onBack: () => context.pop(),
+      onBack: () => context.pop(_didMutate),
       trailing: _buildHeaderMenu(),
     );
   }
@@ -379,10 +380,11 @@ class _TodoDetailScreenState extends State<TodoDetailScreen> {
     }
     final changed = await context.push<bool>(AppRoutes.todoEdit(_todo!.id));
     if (changed == true) {
-      await _loadTodo();
-      if (mounted && _error != null) {
-        Toast.show(context, '刷新失败: $_error', type: ToastType.error);
+      _didMutate = true;
+      if (!mounted) {
+        return;
       }
+      context.pop(true);
     }
   }
 
@@ -398,7 +400,7 @@ class _TodoDetailScreenState extends State<TodoDetailScreen> {
       try {
         await _todoApi.deleteTodo(_todo!.id);
         if (mounted) {
-          context.pop();
+          context.pop(true);
         }
       } catch (e) {
         if (mounted) {