refactor: 重构 chat_page 对接完整架构，集成全部 stream event widget

## 问题
chat_page.dart 包含内联的简化版 ChatMessage/ChatState/ChatNotifier（约180行），
绕过了已实现的完整 Clean Architecture 层：
- domain/entities/chat_message.dart（含 ToolExecution、ApprovalRequest）
- domain/entities/stream_event.dart（9种 sealed class 事件）
- chat_providers.dart（完整 ChatNotifier 支持审批/工具/常驻指令）
- 5 个独立 widget 全部闲置未使用

## 变更
1. 删除内联重复代码（~180行）：ChatRole、ChatContentType、内联 ChatMessage、
   内联 ChatState、内联 ChatNotifier、chatMessagesProvider
2. 切换到正式 chatProvider（chat_providers.dart），支持全部 9 种 StreamEvent
3. 集成 5 个已有 widget：
   - MessageBubble — 用户/AI 消息气泡（带时间戳）
   - StreamTextWidget — AI 流式回复动画光标
   - ToolExecutionCard — 工具执行详情（名称/输入/输出/状态/风险等级）
   - ApprovalActionCard — 审批卡片（倒计时/通过/拒绝/过期处理）
   - AgentThinkingIndicator — 思考动画指示器
4. 新增 _AgentStatusBar — 实时状态条（思考中/执行中/等待审批）
5. 新增 _StandingOrderDraftCard — 常驻指令草案渲染
6. AppBar + 输入区添加停止按钮，审批等待时显示提示
7. 消息渲染按 MessageType 分发：text/thinking/toolUse/toolResult/approval/standingOrderDraft

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

it0_app/lib/features/chat/presentation/pages/chat_page.dart

@@ -8,193 +8,14 @@ import '../../../../core/audio/noise_reducer.dart';
 import '../../../../core/audio/speech_enhancer.dart';
 import '../../../../core/config/api_endpoints.dart';
 import '../../../../core/network/dio_client.dart';
-import '../../../../core/network/websocket_client.dart';
 import '../../../../core/theme/app_colors.dart';
-
+import '../../domain/entities/chat_message.dart';
-// ---------------------------------------------------------------------------
+import '../providers/chat_providers.dart';
-// TODO 39 & 40 – Chat page: message send + voice input
+import '../widgets/message_bubble.dart';
-// ---------------------------------------------------------------------------
+import '../widgets/tool_execution_card.dart';
-
+import '../widgets/approval_action_card.dart';
-// ---- Chat message model ----------------------------------------------------
+import '../widgets/agent_thinking_indicator.dart';
-
+import '../widgets/stream_text_widget.dart';
-enum ChatRole { user, assistant, system }
-enum ChatContentType { text, toolUse }
-
-class ChatMessage {
-  final String id;
-  final ChatRole role;
-  final ChatContentType contentType;
-  final String content;
-  final DateTime timestamp;
-
-  const ChatMessage({
-    required this.id,
-    required this.role,
-    required this.contentType,
-    required this.content,
-    required this.timestamp,
-  });
-}
-
-// ---- Chat state notifier ---------------------------------------------------
-
-class ChatState {
-  final List<ChatMessage> messages;
-  final bool isStreaming;
-  final String? sessionId;
-  final String? error;
-
-  const ChatState({
-    this.messages = const [],
-    this.isStreaming = false,
-    this.sessionId,
-    this.error,
-  });
-
-  ChatState copyWith({
-    List<ChatMessage>? messages,
-    bool? isStreaming,
-    String? sessionId,
-    String? error,
-  }) {
-    return ChatState(
-      messages: messages ?? this.messages,
-      isStreaming: isStreaming ?? this.isStreaming,
-      sessionId: sessionId ?? this.sessionId,
-      error: error,
-    );
-  }
-}
-
-class ChatNotifier extends StateNotifier<ChatState> {
-  final Ref _ref;
-  StreamSubscription<Map<String, dynamic>>? _wsSubscription;
-
-  ChatNotifier(this._ref) : super(const ChatState());
-
-  /// Sends a user prompt, creates a task via the agent endpoint, subscribes to
-  /// the session WebSocket, and streams response messages into the chat.
-  Future<void> sendMessage(String prompt) async {
-    if (prompt.trim().isEmpty) return;
-
-    // Add the user message locally
-    final userMsg = ChatMessage(
-      id: DateTime.now().microsecondsSinceEpoch.toString(),
-      role: ChatRole.user,
-      contentType: ChatContentType.text,
-      content: prompt,
-      timestamp: DateTime.now(),
-    );
-    state = state.copyWith(
-      messages: [...state.messages, userMsg],
-      isStreaming: true,
-      error: null,
-    );
-
-    try {
-      // POST to agent tasks endpoint
-      final dio = _ref.read(dioClientProvider);
-      final response = await dio.post(
-        ApiEndpoints.tasks,
-        data: {'prompt': prompt},
-      );
-      final data = response.data as Map<String, dynamic>;
-      final sessionId = data['sessionId'] as String? ?? data['session_id'] as String?;
-      final taskId = data['taskId'] as String? ?? data['task_id'] as String?;
-
-      if (sessionId == null) {
-        state = state.copyWith(isStreaming: false, error: '未返回 sessionId');
-        return;
-      }
-
-      state = state.copyWith(sessionId: sessionId);
-
-      // Connect to agent WebSocket and subscribe
-      final wsClient = _ref.read(webSocketClientProvider);
-      await wsClient.connect('/ws/agent');
-      wsClient.send({
-        'event': 'subscribe_session',
-        'data': {'sessionId': sessionId, 'taskId': taskId},
-      });
-
-      // Listen for stream_event messages
-      _wsSubscription?.cancel();
-      _wsSubscription = wsClient.messages.listen((msg) {
-        final event = msg['event'] as String? ?? msg['type'] as String? ?? '';
-        if (event == 'stream_event' || event == 'message') {
-          _handleStreamEvent(msg['data'] as Map<String, dynamic>? ?? msg);
-        } else if (event == 'stream_end' || event == 'done' || event == 'complete') {
-          state = state.copyWith(isStreaming: false);
-          _wsSubscription?.cancel();
-        } else if (event == 'error') {
-          state = state.copyWith(
-            isStreaming: false,
-            error: msg['message'] as String? ?? '流式传输错误',
-          );
-          _wsSubscription?.cancel();
-        }
-      });
-    } catch (e) {
-      state = state.copyWith(isStreaming: false, error: e.toString());
-    }
-  }
-
-  void _handleStreamEvent(Map<String, dynamic> data) {
-    final type = data['type'] as String? ?? 'text';
-    final content = data['content'] as String? ?? data['text'] as String? ?? '';
-
-    final ChatContentType contentType;
-    if (type == 'tool_use' || type == 'tool_call') {
-      contentType = ChatContentType.toolUse;
-    } else {
-      contentType = ChatContentType.text;
-    }
-
-    // If the last message is an assistant text message that is still streaming,
-    // append to it instead of creating a new bubble.
-    if (contentType == ChatContentType.text && state.messages.isNotEmpty) {
-      final last = state.messages.last;
-      if (last.role == ChatRole.assistant && last.contentType == ChatContentType.text) {
-        final updated = ChatMessage(
-          id: last.id,
-          role: ChatRole.assistant,
-          contentType: ChatContentType.text,
-          content: last.content + content,
-          timestamp: last.timestamp,
-        );
-        state = state.copyWith(
-          messages: [...state.messages.sublist(0, state.messages.length - 1), updated],
-        );
-        return;
-      }
-    }
-
-    final msg = ChatMessage(
-      id: DateTime.now().microsecondsSinceEpoch.toString(),
-      role: ChatRole.assistant,
-      contentType: contentType,
-      content: content,
-      timestamp: DateTime.now(),
-    );
-    state = state.copyWith(messages: [...state.messages, msg]);
-  }
-
-  void clearChat() {
-    _wsSubscription?.cancel();
-    state = const ChatState();
-  }
-
-  @override
-  void dispose() {
-    _wsSubscription?.cancel();
-    super.dispose();
-  }
-}
-
-final chatMessagesProvider =
-    StateNotifierProvider<ChatNotifier, ChatState>((ref) {
-  return ChatNotifier(ref);
-});
 
 // ---------------------------------------------------------------------------
 // Chat page – ConsumerStatefulWidget
@@ -315,7 +136,7 @@ class _ChatPageState extends ConsumerState<ChatPage> with SingleTickerProviderSt
     final text = _messageController.text.trim();
     if (text.isEmpty) return;
     _messageController.clear();
-    ref.read(chatMessagesProvider.notifier).sendMessage(text);
+    ref.read(chatProvider.notifier).sendMessage(text);
     _scrollToBottom();
   }
 
@@ -331,26 +152,150 @@ class _ChatPageState extends ConsumerState<ChatPage> with SingleTickerProviderSt
     });
   }
 
+  // -- Message widget dispatch -----------------------------------------------
+
+  Widget _buildMessageWidget(ChatMessage message, ChatState chatState) {
+    final isLastMessage = chatState.messages.last.id == message.id;
+    final isStreamingNow = isLastMessage && chatState.isStreaming;
+
+    switch (message.type) {
+      case MessageType.toolUse:
+      case MessageType.toolResult:
+        if (message.toolExecution != null) {
+          return ToolExecutionCard(toolExecution: message.toolExecution!);
+        }
+        return MessageBubble(message: message);
+
+      case MessageType.approval:
+        if (message.approvalRequest != null) {
+          return ApprovalActionCard(
+            approvalRequest: message.approvalRequest!,
+            onApprove: () => ref.read(chatProvider.notifier)
+                .approveCommand(message.approvalRequest!.taskId),
+            onReject: (reason) => ref.read(chatProvider.notifier)
+                .rejectCommand(message.approvalRequest!.taskId, reason: reason),
+          );
+        }
+        return MessageBubble(message: message);
+
+      case MessageType.standingOrderDraft:
+        return _StandingOrderDraftCard(
+          draft: message.metadata ?? {},
+          onConfirm: () => ref.read(chatProvider.notifier)
+              .confirmStandingOrder(message.metadata ?? {}),
+        );
+
+      case MessageType.thinking:
+        // AI thinking content — italic label + streaming text
+        return Align(
+          alignment: Alignment.centerLeft,
+          child: Container(
+            margin: const EdgeInsets.symmetric(vertical: 4),
+            padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 10),
+            constraints: BoxConstraints(
+              maxWidth: MediaQuery.of(context).size.width * 0.78,
+            ),
+            decoration: BoxDecoration(
+              color: AppColors.surface,
+              borderRadius: const BorderRadius.only(
+                topLeft: Radius.circular(16),
+                topRight: Radius.circular(16),
+                bottomLeft: Radius.circular(4),
+                bottomRight: Radius.circular(16),
+              ),
+            ),
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Text(
+                  '思考中...',
+                  style: TextStyle(
+                    color: AppColors.textMuted,
+                    fontSize: 11,
+                    fontStyle: FontStyle.italic,
+                  ),
+                ),
+                const SizedBox(height: 4),
+                StreamTextWidget(
+                  text: message.content,
+                  isStreaming: isStreamingNow,
+                  style: TextStyle(
+                    color: AppColors.textSecondary,
+                    fontSize: 14,
+                  ),
+                ),
+              ],
+            ),
+          ),
+        );
+
+      case MessageType.text:
+      default:
+        // User messages → standard bubble
+        if (message.role == MessageRole.user) {
+          return MessageBubble(message: message);
+        }
+        // AI text messages — use StreamTextWidget when actively streaming
+        if (isStreamingNow) {
+          return Align(
+            alignment: Alignment.centerLeft,
+            child: Container(
+              margin: const EdgeInsets.symmetric(vertical: 4),
+              padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 10),
+              constraints: BoxConstraints(
+                maxWidth: MediaQuery.of(context).size.width * 0.78,
+              ),
+              decoration: BoxDecoration(
+                color: AppColors.surface,
+                borderRadius: const BorderRadius.only(
+                  topLeft: Radius.circular(16),
+                  topRight: Radius.circular(16),
+                  bottomLeft: Radius.circular(4),
+                  bottomRight: Radius.circular(16),
+                ),
+              ),
+              child: StreamTextWidget(
+                text: message.content,
+                isStreaming: true,
+                style: const TextStyle(
+                  color: AppColors.textPrimary,
+                  fontSize: 15,
+                ),
+              ),
+            ),
+          );
+        }
+        return MessageBubble(message: message);
+    }
+  }
+
   // -- Build -----------------------------------------------------------------
 
   @override
   Widget build(BuildContext context) {
-    final chatState = ref.watch(chatMessagesProvider);
+    final chatState = ref.watch(chatProvider);
 
     // Auto-scroll when messages change
-    ref.listen(chatMessagesProvider, (_, __) => _scrollToBottom());
+    ref.listen(chatProvider, (_, __) => _scrollToBottom());
 
     return Scaffold(
       appBar: AppBar(
         title: const Text('AI 对话'),
         actions: [
+          // Stop button during streaming
+          if (chatState.isStreaming)
+            IconButton(
+              icon: const Icon(Icons.stop_circle_outlined),
+              tooltip: '停止',
+              onPressed: () => ref.read(chatProvider.notifier).cancelCurrentTask(),
+            ),
           if (chatState.messages.isNotEmpty)
             IconButton(
               icon: const Icon(Icons.delete_outline),
               tooltip: '清空对话',
-              onPressed: () => ref.read(chatMessagesProvider.notifier).clearChat(),
+              onPressed: () => ref.read(chatProvider.notifier).clearChat(),
             ),
-          // Voice input button (TODO 40)
+          // Voice input button
           GestureDetector(
             onLongPressStart: (_) => _startListening(),
             onLongPressEnd: (_) => _stopListening(autoSubmit: true),
@@ -388,12 +333,16 @@ class _ChatPageState extends ConsumerState<ChatPage> with SingleTickerProviderSt
               actions: [
                 TextButton(
                   onPressed: () =>
-                      ref.read(chatMessagesProvider.notifier).clearChat(),
+                      ref.read(chatProvider.notifier).clearChat(),
                   child: const Text('关闭'),
                 ),
               ],
             ),
 
+          // Agent status bar
+          if (chatState.agentStatus != AgentStatus.idle && chatState.agentStatus != AgentStatus.error)
+            _AgentStatusBar(status: chatState.agentStatus),
+
           // Message list
           Expanded(
             child: chatState.messages.isEmpty
@@ -418,13 +367,17 @@ class _ChatPageState extends ConsumerState<ChatPage> with SingleTickerProviderSt
                 : ListView.builder(
                     controller: _scrollController,
                     padding: const EdgeInsets.fromLTRB(12, 8, 12, 8),
-                    itemCount: chatState.messages.length + (chatState.isStreaming ? 1 : 0),
+                    itemCount: chatState.messages.length +
+                        (chatState.agentStatus == AgentStatus.thinking ? 1 : 0),
                     itemBuilder: (context, index) {
+                      // Trailing thinking indicator
                       if (index == chatState.messages.length) {
-                        // Typing indicator
+                        return const AgentThinkingIndicator();
-                        return _TypingIndicator();
                       }
-                      return _ChatBubble(message: chatState.messages[index]);
+                      return _buildMessageWidget(
+                        chatState.messages[index],
+                        chatState,
+                      );
                     },
                   ),
           ),
@@ -470,14 +423,34 @@ class _ChatPageState extends ConsumerState<ChatPage> with SingleTickerProviderSt
             ),
 
           // Input row
-          Container(
+          _buildInputArea(chatState),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildInputArea(ChatState chatState) {
+    final isDisabled = chatState.isStreaming || chatState.agentStatus == AgentStatus.awaitingApproval;
+
+    return Container(
       padding: const EdgeInsets.all(8),
       decoration: BoxDecoration(
         color: AppColors.surface,
         border: Border(top: BorderSide(color: AppColors.surfaceLight.withOpacity(0.5))),
       ),
       child: SafeArea(
-              child: Row(
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            if (chatState.agentStatus == AgentStatus.awaitingApproval)
+              Padding(
+                padding: const EdgeInsets.only(bottom: 8),
+                child: Text(
+                  '等待审批中...',
+                  style: TextStyle(color: AppColors.warning, fontSize: 12),
+                ),
+              ),
+            Row(
               children: [
                 Expanded(
                   child: TextField(
@@ -491,26 +464,26 @@ class _ChatPageState extends ConsumerState<ChatPage> with SingleTickerProviderSt
                     ),
                     textInputAction: TextInputAction.send,
                     onSubmitted: (_) => _send(),
-                      enabled: !chatState.isStreaming,
+                    enabled: !isDisabled,
                   ),
                 ),
                 const SizedBox(width: 8),
+                if (chatState.isStreaming)
                   IconButton(
-                    icon: chatState.isStreaming
+                    icon: const Icon(Icons.stop_circle_outlined, color: AppColors.error),
-                        ? const SizedBox(
+                    tooltip: '停止',
-                            width: 24,
+                    onPressed: () => ref.read(chatProvider.notifier).cancelCurrentTask(),
-                            height: 24,
-                            child: CircularProgressIndicator(strokeWidth: 2),
                   )
-                        : const Icon(Icons.send),
+                else
-                    onPressed: chatState.isStreaming ? null : _send,
+                  IconButton(
+                    icon: const Icon(Icons.send),
+                    onPressed: isDisabled ? null : _send,
                   ),
               ],
             ),
-            ),
-          ),
           ],
         ),
+      ),
     );
   }
 
@@ -527,81 +500,114 @@ class _ChatPageState extends ConsumerState<ChatPage> with SingleTickerProviderSt
 }
 
 // ---------------------------------------------------------------------------
-// Private helper widgets
+// Agent status bar
 // ---------------------------------------------------------------------------
 
-class _ChatBubble extends StatelessWidget {
+class _AgentStatusBar extends StatelessWidget {
-  final ChatMessage message;
+  final AgentStatus status;
-  const _ChatBubble({required this.message});
+  const _AgentStatusBar({required this.status});
-
-  bool get _isUser => message.role == ChatRole.user;
 
   @override
   Widget build(BuildContext context) {
-    if (message.contentType == ChatContentType.toolUse) {
+    final (String label, Color color, IconData icon) = switch (status) {
-      return _ToolUseCard(content: message.content);
+      AgentStatus.thinking => ('AI 正在思考...', AppColors.info, Icons.psychology),
-    }
+      AgentStatus.executing => ('正在执行命令...', AppColors.primary, Icons.terminal),
+      AgentStatus.awaitingApproval => ('等待审批', AppColors.warning, Icons.shield_outlined),
+      _ => ('', AppColors.textMuted, Icons.info_outline),
+    };
 
-    return Align(
+    if (label.isEmpty) return const SizedBox.shrink();
-      alignment: _isUser ? Alignment.centerRight : Alignment.centerLeft,
+
-      child: Container(
+    return Container(
-        margin: const EdgeInsets.symmetric(vertical: 4),
+      width: double.infinity,
-        padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 10),
+      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
-        constraints: BoxConstraints(
+      color: color.withOpacity(0.1),
-          maxWidth: MediaQuery.of(context).size.width * 0.78,
+      child: Row(
-        ),
+        children: [
-        decoration: BoxDecoration(
+          SizedBox(
-          color: _isUser ? AppColors.primary : AppColors.surface,
+            width: 16,
-          borderRadius: BorderRadius.only(
+            height: 16,
-            topLeft: const Radius.circular(16),
+            child: status == AgentStatus.executing
-            topRight: const Radius.circular(16),
+                ? CircularProgressIndicator(strokeWidth: 2, color: color)
-            bottomLeft: Radius.circular(_isUser ? 16 : 4),
+                : Icon(icon, size: 16, color: color),
-            bottomRight: Radius.circular(_isUser ? 4 : 16),
-          ),
-        ),
-        child: Text(
-          message.content,
-          style: TextStyle(
-            color: _isUser ? Colors.white : AppColors.textPrimary,
-            fontSize: 15,
           ),
+          const SizedBox(width: 8),
+          Text(
+            label,
+            style: TextStyle(color: color, fontSize: 13, fontWeight: FontWeight.w500),
           ),
+        ],
       ),
     );
   }
 }
 
-class _ToolUseCard extends StatelessWidget {
+// ---------------------------------------------------------------------------
-  final String content;
+// Standing order draft card
-  const _ToolUseCard({required this.content});
+// ---------------------------------------------------------------------------
+
+class _StandingOrderDraftCard extends StatelessWidget {
+  final Map<String, dynamic> draft;
+  final VoidCallback onConfirm;
+
+  const _StandingOrderDraftCard({
+    required this.draft,
+    required this.onConfirm,
+  });
 
   @override
   Widget build(BuildContext context) {
+    final name = draft['name'] as String? ?? draft['orderName'] as String? ?? '未命名指令';
+    final cron = draft['cron'] as String? ?? draft['schedule'] as String? ?? '';
+    final command = draft['command'] as String? ?? draft['prompt'] as String? ?? '';
+    final targets = draft['targets'] as List? ?? draft['servers'] as List? ?? [];
+
     return Container(
       margin: const EdgeInsets.symmetric(vertical: 6),
-      padding: const EdgeInsets.all(12),
+      padding: const EdgeInsets.all(14),
       decoration: BoxDecoration(
-        color: AppColors.surfaceLight.withOpacity(0.5),
+        color: AppColors.surface,
         borderRadius: BorderRadius.circular(12),
-        border: Border.all(color: AppColors.primary.withOpacity(0.3)),
+        border: Border.all(color: AppColors.primary.withOpacity(0.4)),
       ),
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
+          // Header
           Row(
             children: [
-              Icon(Icons.code, size: 16, color: AppColors.primary),
+              Icon(Icons.schedule, size: 18, color: AppColors.primary),
-              const SizedBox(width: 6),
+              const SizedBox(width: 8),
-              Text(
+              Expanded(
-                '工具执行',
+                child: Text(
+                  '常驻指令草案',
                   style: TextStyle(
-                  color: AppColors.primary,
-                  fontSize: 12,
                     fontWeight: FontWeight.w600,
+                    fontSize: 14,
+                    color: AppColors.primary,
+                  ),
                 ),
               ),
             ],
           ),
+
+          const SizedBox(height: 10),
+
+          // Name
+          Text(name, style: const TextStyle(fontWeight: FontWeight.w600, fontSize: 15)),
+
+          if (cron.isNotEmpty) ...[
+            const SizedBox(height: 6),
+            Row(
+              children: [
+                const Icon(Icons.timer_outlined, size: 14, color: AppColors.textMuted),
+                const SizedBox(width: 6),
+                Text(cron, style: const TextStyle(color: AppColors.textSecondary, fontSize: 12, fontFamily: 'monospace')),
+              ],
+            ),
+          ],
+
+          if (command.isNotEmpty) ...[
             const SizedBox(height: 8),
             Container(
               width: double.infinity,
@@ -611,88 +617,57 @@ class _ToolUseCard extends StatelessWidget {
                 borderRadius: BorderRadius.circular(8),
               ),
               child: SelectableText(
-              content,
+                command,
-              style: const TextStyle(
+                style: const TextStyle(fontFamily: 'monospace', fontSize: 12, color: AppColors.textSecondary),
-                fontFamily: 'monospace',
-                fontSize: 12,
-                color: AppColors.textSecondary,
               ),
             ),
+          ],
+
+          if (targets.isNotEmpty) ...[
+            const SizedBox(height: 6),
+            Row(
+              children: [
+                const Icon(Icons.dns, size: 14, color: AppColors.textMuted),
+                const SizedBox(width: 6),
+                Text(
+                  '目标: ${targets.join(", ")}',
+                  style: const TextStyle(color: AppColors.textSecondary, fontSize: 12),
+                ),
+              ],
+            ),
+          ],
+
+          const SizedBox(height: 12),
+
+          // Action buttons
+          Row(
+            mainAxisAlignment: MainAxisAlignment.end,
+            children: [
+              OutlinedButton(
+                onPressed: () {
+                  // Dismiss — no specific API call needed
+                },
+                style: OutlinedButton.styleFrom(
+                  foregroundColor: AppColors.textSecondary,
+                  padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
+                  minimumSize: Size.zero,
+                ),
+                child: const Text('取消', style: TextStyle(fontSize: 13)),
+              ),
+              const SizedBox(width: 8),
+              FilledButton(
+                onPressed: onConfirm,
+                style: FilledButton.styleFrom(
+                  backgroundColor: AppColors.primary,
+                  padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
+                  minimumSize: Size.zero,
+                ),
+                child: const Text('确认', style: TextStyle(fontSize: 13)),
+              ),
+            ],
           ),
         ],
       ),
     );
   }
 }
-
-class _TypingIndicator extends StatefulWidget {
-  @override
-  State<_TypingIndicator> createState() => _TypingIndicatorState();
-}
-
-class _TypingIndicatorState extends State<_TypingIndicator>
-    with SingleTickerProviderStateMixin {
-  late AnimationController _controller;
-
-  @override
-  void initState() {
-    super.initState();
-    _controller = AnimationController(
-      vsync: this,
-      duration: const Duration(milliseconds: 1200),
-    )..repeat();
-  }
-
-  @override
-  void dispose() {
-    _controller.dispose();
-    super.dispose();
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    return Align(
-      alignment: Alignment.centerLeft,
-      child: Container(
-        margin: const EdgeInsets.symmetric(vertical: 4),
-        padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
-        decoration: BoxDecoration(
-          color: AppColors.surface,
-          borderRadius: BorderRadius.circular(16),
-        ),
-        child: AnimatedBuilder(
-          animation: _controller,
-          builder: (context, _) {
-            return Row(
-              mainAxisSize: MainAxisSize.min,
-              children: List.generate(3, (i) {
-                final delay = i * 0.33;
-                final t = ((_controller.value + delay) % 1.0);
-                final opacity = (t < 0.5) ? 0.3 + t * 1.0 : 1.3 - t * 1.0;
-                return Padding(
-                  padding: const EdgeInsets.symmetric(horizontal: 3),
-                  child: Opacity(
-                    opacity: opacity.clamp(0.3, 1.0),
-                    child: Container(
-                      width: 8,
-                      height: 8,
-                      decoration: const BoxDecoration(
-                        color: AppColors.textSecondary,
-                        shape: BoxShape.circle,
-                      ),
-                    ),
-                  ),
-                );
-              }),
-            );
-          },
-        ),
-      ),
-    );
-  }
-}
-
-/// A mini [AnimatedWidget] wrapper used in lieu of [AnimatedBuilder].
-/// Flutter's actual class is [AnimatedBuilder]; we re-export via this alias
-/// so that the code reads naturally and works with the stable API.
-/// (AnimatedBuilder is the stable name since Flutter 3.x.)