feat: 增强 HomeScreen 录音交互与 ChatBloc 状态管理

- 新增录音启动延迟处理，解决权限未就绪时的竞态问题
- 实现历史分页滚动位置保持，提升加载体验
- 添加文本输入框点击键盘显示与焦点管理
- 优化 ChatBloc provider 到 MultiBlocProvider 支持
- 修复 ApiException 429 错误详情解析（支持 JSON 字符串 body）
- 改进 LocalNotificationService 精确闹钟权限请求
- 优化 UiSchemaRenderer GridView children 生成
- 支持导航 action 的 replace 参数
- 移除 Agent router 速率限制逻辑（_allow_run_request, _allow_transcribe_request）
- 补充相关单元测试与集成测试

apps/test/features/home/ui/widgets/home_screen_layout_test.dart

@@ -1,14 +1,59 @@
 import 'package:dio/dio.dart';
+import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:image_picker/image_picker.dart';
 import 'package:social_app/core/api/i_api_client.dart';
 import 'package:social_app/core/di/injection.dart';
 import 'package:social_app/features/chat/presentation/bloc/chat_bloc.dart';
+import 'package:social_app/features/home/data/voice_recorder.dart';
 import 'package:social_app/features/home/ui/screens/home_screen.dart';
 import 'package:social_app/features/home/ui/widgets/home_attachment_strip.dart';
 import 'package:social_app/features/home/ui/widgets/home_floating_header.dart';
 import 'package:social_app/features/messages/data/inbox_api.dart';
+import 'package:social_app/shared/widgets/message_composer.dart';
+
+class _PermissionDeniedRecorder implements VoiceRecorder {
+  _PermissionDeniedRecorder();
+
+  int stopCalls = 0;
+
+  @override
+  Future<void> dispose() async {}
+
+  @override
+  Future<void> start() async {
+    await Future<void>.delayed(const Duration(milliseconds: 400));
+    throw StateError('录音权限未授权');
+  }
+
+  @override
+  Future<String?> stop() async {
+    stopCalls += 1;
+    return null;
+  }
+}
+
+class _DelayedSuccessRecorder implements VoiceRecorder {
+  _DelayedSuccessRecorder();
+
+  int stopCalls = 0;
+
+  @override
+  Future<void> dispose() async {}
+
+  @override
+  Future<void> start() async {
+    await Future<void>.delayed(const Duration(milliseconds: 400));
+  }
+
+  @override
+  Future<String?> stop() async {
+    stopCalls += 1;
+    return '/tmp/mock-recording.wav';
+  }
+}
 
 class _TestApiClient implements IApiClient {
   @override
@@ -65,6 +110,8 @@ void main() {
   Future<void> pumpHomeScreen(
     WidgetTester tester, {
     List<XFile> initialSelectedImages = const [],
+    VoiceRecorder? voiceRecorder,
+    Future<String> Function(String filePath)? onTranscribeAudio,
   }) async {
     await tester.pumpWidget(
       MaterialApp(
@@ -72,6 +119,8 @@ void main() {
           chatBloc: chatBloc,
           autoLoadHistory: false,
           initialSelectedImages: initialSelectedImages,
+          voiceRecorder: voiceRecorder,
+          onTranscribeAudio: onTranscribeAudio,
         ),
       ),
     );
@@ -111,4 +160,136 @@ void main() {
 
     expect(find.byKey(homeAttachmentStripKey), findsOneWidget);
   });
+
+  testWidgets(
+    'long press release does not stop recorder before start succeeds',
+    (tester) async {
+      final recorder = _PermissionDeniedRecorder();
+      await pumpHomeScreen(tester, voiceRecorder: recorder);
+
+      final holdArea = find.byKey(messageComposerHoldAreaKey);
+      expect(holdArea, findsOneWidget);
+
+      final center = tester.getCenter(holdArea);
+      final gesture = await tester.startGesture(center);
+      await tester.pump(const Duration(milliseconds: 130));
+      await gesture.up();
+      await tester.pump(const Duration(milliseconds: 500));
+
+      expect(recorder.stopCalls, 0);
+      expect(tester.takeException(), isNull);
+      await tester.pump(const Duration(seconds: 3));
+    },
+  );
+
+  testWidgets('switching to text mode does not auto focus input', (
+    tester,
+  ) async {
+    await pumpHomeScreen(tester);
+
+    await tester.tap(find.byKey(messageComposerRightButtonKey));
+    await tester.pump();
+    await tester.pump();
+
+    final editable = tester.widget<EditableText>(find.byType(EditableText));
+    expect(editable.focusNode.hasFocus, isFalse);
+  });
+
+  testWidgets('single tap on input focuses text field after mode switch', (
+    tester,
+  ) async {
+    await pumpHomeScreen(tester);
+
+    await tester.tap(find.byKey(messageComposerRightButtonKey));
+    await tester.pump();
+    await tester.pump();
+
+    await tester.tap(find.byType(EditableText));
+    await tester.pump();
+
+    final editable = tester.widget<EditableText>(find.byType(EditableText));
+    expect(editable.focusNode.hasFocus, isTrue);
+  });
+
+  testWidgets('tap focused input triggers keyboard show once', (tester) async {
+    var showCalls = 0;
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+        .setMockMethodCallHandler(SystemChannels.textInput, (call) async {
+          if (call.method == 'TextInput.show') {
+            showCalls += 1;
+          }
+          return null;
+        });
+    addTearDown(() {
+      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+          .setMockMethodCallHandler(SystemChannels.textInput, null);
+    });
+
+    await pumpHomeScreen(tester);
+    await tester.tap(find.byKey(messageComposerRightButtonKey));
+    await tester.pump();
+    await tester.pump();
+
+    await tester.tap(find.byType(EditableText));
+    await tester.pump();
+    showCalls = 0;
+
+    await tester.tap(find.byType(EditableText));
+    await tester.pump();
+
+    expect(showCalls, 1);
+  });
+
+  testWidgets('release during delayed start continues to transcribe path', (
+    tester,
+  ) async {
+    final recorder = _DelayedSuccessRecorder();
+    var transcribeCalls = 0;
+    await pumpHomeScreen(
+      tester,
+      voiceRecorder: recorder,
+      onTranscribeAudio: (_) async {
+        transcribeCalls += 1;
+        return '';
+      },
+    );
+
+    final holdArea = find.byKey(messageComposerHoldAreaKey);
+    final center = tester.getCenter(holdArea);
+    final gesture = await tester.startGesture(center);
+    await tester.pump(const Duration(milliseconds: 130));
+    await gesture.up();
+    await tester.pump(const Duration(milliseconds: 500));
+
+    expect(recorder.stopCalls, 1);
+    expect(transcribeCalls, 1);
+    await tester.pump(const Duration(seconds: 3));
+  });
+
+  testWidgets('cancel during delayed start skips transcribe path', (
+    tester,
+  ) async {
+    final recorder = _DelayedSuccessRecorder();
+    var transcribeCalls = 0;
+    await pumpHomeScreen(
+      tester,
+      voiceRecorder: recorder,
+      onTranscribeAudio: (_) async {
+        transcribeCalls += 1;
+        return 'ignored';
+      },
+    );
+
+    final holdArea = find.byKey(messageComposerHoldAreaKey);
+    final center = tester.getCenter(holdArea);
+    final gesture = await tester.startGesture(center);
+    await tester.pump(const Duration(milliseconds: 130));
+    await gesture.moveBy(const Offset(0, -90));
+    await tester.pump();
+    await gesture.up();
+    await tester.pump(const Duration(milliseconds: 500));
+
+    expect(recorder.stopCalls, 1);
+    expect(transcribeCalls, 0);
+  });
 }