refactor(apps): 主题系统迁移至 ColorScheme + 扩展架构并支持 Dark Mode

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

@@ -5,15 +5,15 @@ import 'package:flutter/services.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:go_router/go_router.dart';
 import 'package:image_picker/image_picker.dart';
+import 'package:social_app/core/chat/agent_stage.dart';
 import '../../../../core/network/api_exception.dart';
 import '../../../../app/di/injection.dart';
 import '../../../../app/router/app_route_observer.dart';
 import '../../../../app/router/app_routes.dart';
 import '../../../../core/l10n/l10n.dart';
 import '../../../../core/theme/design_tokens.dart';
-import '../../../chat/presentation/bloc/agent_stage.dart';
+import '../../../../data/repositories/inbox_repository.dart';
 import '../../../chat/presentation/bloc/chat_bloc.dart';
-import '../../../messages/data/inbox_api.dart';
 import '../../data/voice_recorder.dart';
 import '../controllers/home_keyboard_inset_calculator.dart';
 import '../controllers/home_message_viewport_controller.dart';
@@ -47,9 +47,6 @@ const homeConversationStageKey = ValueKey('home_conversation_stage');
 const homeBottomInputStackKey = ValueKey('home_bottom_input_stack');
 const homeEmptyStateAmbientKey = ValueKey('home_empty_state_ambient');
 
-/// Color constants.
-const _chatBgColor = AppColors.slate50;
-
 class HomeScreen extends StatefulWidget {
   final VoiceRecorder? voiceRecorder;
   final Future<String> Function(String filePath)? onTranscribeAudio;
@@ -76,7 +73,7 @@ class _HomeScreenState extends State<HomeScreen>
   final ScrollController _scrollController = ScrollController();
   late final ChatBloc _chatBloc;
   late final VoiceRecorder _voiceRecorder;
-  late final InboxApi _inboxApi;
+  late final InboxRepository _inboxRepository;
   late final Future<String> Function(String filePath) _transcribeAudio;
   late final AnimationController _listeningAnimationController;
   bool _isRecording = false;
@@ -113,7 +110,7 @@ class _HomeScreenState extends State<HomeScreen>
       _chatBloc = context.read<ChatBloc>();
     }
     _voiceRecorder = widget.voiceRecorder ?? RecordVoiceRecorder();
-    _inboxApi = sl<InboxApi>();
+    _inboxRepository = sl<InboxRepository>();
     _transcribeAudio =
         widget.onTranscribeAudio ?? _chatBloc.transcribeAudioFile;
     _listeningAnimationController = AnimationController(
@@ -132,7 +129,7 @@ class _HomeScreenState extends State<HomeScreen>
 
   Future<void> _loadUnreadCount() async {
     try {
-      final messages = await _inboxApi.getMessages(isRead: false);
+      final messages = await _inboxRepository.getMessages(isRead: false);
       if (mounted) {
         setState(() => _unreadCount = messages.length);
       }
@@ -220,8 +217,10 @@ class _HomeScreenState extends State<HomeScreen>
           _previousIsLoadingHistory = state.isLoadingHistory;
         },
         builder: (context, state) {
+          final colorScheme = Theme.of(context).colorScheme;
+
           return Scaffold(
-            backgroundColor: _chatBgColor,
+            backgroundColor: colorScheme.surface,
             resizeToAvoidBottomInset: false,
             body: SafeArea(
               maintainBottomViewPadding: true,
@@ -688,6 +687,8 @@ class _HomeEmptyStateAmbient extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+
     return Center(
       child: IgnorePointer(
         child: Container(
@@ -701,9 +702,9 @@ class _HomeEmptyStateAmbient extends StatelessWidget {
               begin: Alignment.centerLeft,
               end: Alignment.centerRight,
               colors: [
-                AppColors.homeBackgroundGlowSoft.withValues(alpha: 0.12),
-                AppColors.homeBackgroundGlow.withValues(alpha: 0.08),
-                AppColors.homeBackgroundGlowSoft.withValues(alpha: 0.12),
+                colorScheme.primaryContainer.withValues(alpha: 0.12),
+                colorScheme.primary.withValues(alpha: 0.08),
+                colorScheme.primaryContainer.withValues(alpha: 0.12),
               ],
             ),
           ),