feat: 优化前端 UI 与交互体验

apps/lib/features/home/ui/screens/home_screen.dart

@@ -16,6 +16,7 @@ import '../../../messages/data/inbox_api.dart';
 import '../../data/voice_recorder.dart';
 import '../../../chat/ui/widgets/ui_schema_renderer.dart';
 import '../../../../shared/widgets/app_loading_indicator.dart';
+import '../../../../shared/widgets/app_pull_refresh_feedback.dart';
 import '../../../../shared/widgets/message_composer.dart';
 import '../../../../shared/widgets/toast/toast.dart';
 import '../../../../shared/widgets/toast/toast_type.dart';
@@ -95,6 +96,7 @@ class _HomeScreenState extends State<HomeScreen>
   bool _isTranscribing = false;
   bool _isCancelGestureActive = false;
   bool _isSendingMessage = false;
+  bool _isPullRefreshing = false;
   int _unreadCount = 0;
   final List<XFile> _selectedImages = [];
 
@@ -210,7 +212,7 @@ class _HomeScreenState extends State<HomeScreen>
               const Positioned.fill(child: _HomeEmptyStateAmbient())
             else
               Positioned.fill(
-                child: RefreshIndicator(
+                child: RefreshIndicator.noSpinner(
                   onRefresh: () => _onRefresh(context),
                   child: ListView.builder(
                     controller: _scrollController,
@@ -260,6 +262,10 @@ class _HomeScreenState extends State<HomeScreen>
                 alignment: Alignment.bottomLeft,
                 child: _buildWaitingIndicator(currentStage: state.currentStage),
               ),
+            Align(
+              alignment: Alignment.topCenter,
+              child: AppPullRefreshFeedback(visible: _isPullRefreshing),
+            ),
           ],
         ),
       ),
@@ -347,7 +353,19 @@ class _HomeScreenState extends State<HomeScreen>
   }
 
   Future<void> _onRefresh(BuildContext context) async {
-    await context.read<ChatBloc>().loadMoreHistory();
+    if (_isPullRefreshing) {
+      return;
+    }
+    if (mounted) {
+      setState(() => _isPullRefreshing = true);
+    }
+    try {
+      await context.read<ChatBloc>().loadMoreHistory();
+    } finally {
+      if (mounted) {
+        setState(() => _isPullRefreshing = false);
+      }
+    }
   }
 
   void _onLoadMore(BuildContext context) {