fix: 首页UI修复 - 底部溢出/胶囊/折叠/抽屉/screen适配

- 底部溢出：移除手动 viewInsets，让 Scaffold 默认处理键盘
- 智能体胶囊：新增常驻选择条，6个胶囊始终可见
- 任务卡片：双向切换，折叠后显示"点击展开"条
- 侧边栏：去掉固定高度，自适应内容
- K70适配：头像/字号/padding 全面紧凑化

health_app/lib/pages/home/home_page.dart

@@ -18,15 +18,11 @@ class _HomePageState extends ConsumerState<HomePage> {
   final _textCtrl = TextEditingController();
   final _scrollCtrl = ScrollController();
   bool _taskCardsExpanded = true;
-  bool _showExpandButton = false;
 
   @override void initState() { super.initState(); _scrollCtrl.addListener(_onScroll); }
   @override void dispose() { _textCtrl.dispose(); _scrollCtrl.dispose(); super.dispose(); }
 
-  void _onScroll() {
-    if (_scrollCtrl.offset > 50 && !_showExpandButton) setState(() => _showExpandButton = true);
-    else if (_scrollCtrl.offset <= 50 && _showExpandButton) setState(() => _showExpandButton = false);
-  }
+  void _onScroll() {}
 
   void _sendMessage() {
     final text = _textCtrl.text.trim();
@@ -39,43 +35,53 @@ class _HomePageState extends ConsumerState<HomePage> {
     final chatState = ref.watch(chatProvider);
     final auth = ref.watch(authProvider);
     final user = auth.user;
-    final bottomInset = MediaQuery.of(context).viewInsets.bottom;
     final selectedAgent = ref.watch(selectedAgentProvider);
 
     return Scaffold(
       drawer: const HealthDrawer(),
       backgroundColor: const Color(0xFFF8F7FF),
       body: SafeArea(
-        child: Stack(children: [
-          Column(children: [
-            _buildHeader(user),
-            if (_taskCardsExpanded) _buildTaskCards(),
-            Expanded(child: ChatMessagesView(scrollCtrl: _scrollCtrl, messages: chatState.messages)),
-            if (selectedAgent != null) _buildAgentPanel(context, selectedAgent),
-            _buildInputBar(context),
-            SizedBox(height: bottomInset > 0 ? bottomInset : 0),
-          ]),
-          _buildExpandButton(),
+        bottom: false,
+        child: Column(children: [
+          // ── 顶部栏 ──
+          _buildHeader(user),
+
+          // ── 今日任务（可折叠） ──
+          _buildTaskCardsArea(),
+
+          // ── 聊天区域（弹性填充剩余空间） ──
+          Expanded(child: ChatMessagesView(scrollCtrl: _scrollCtrl, messages: chatState.messages)),
+
+          // ── 智能体选择器（常驻显示） ──
+          _buildAgentBar(selectedAgent),
+
+          // ── 选中智能体的操作面板 ──
+          if (selectedAgent != null) _buildAgentPanel(context, selectedAgent),
+
+          // ── 输入框 ──
+          _buildInputBar(context),
         ]),
       ),
     );
   }
 
+  // ═════════════════════ 顶部栏 ═════════════════════
+
   Widget _buildHeader(dynamic user) {
     return Container(
-      padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 12),
+      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
       child: Row(children: [
         Builder(builder: (ctx) => GestureDetector(
           onTap: () => Scaffold.of(ctx).openDrawer(),
-          child: CircleAvatar(radius: 22, backgroundColor: const Color(0xFFEDEBFF), backgroundImage: user?.avatarUrl != null ? NetworkImage(user!.avatarUrl!) : null, child: user?.avatarUrl == null ? const Icon(Icons.person, size: 26, color: Color(0xFF635BFF)) : null),
+          child: CircleAvatar(radius: 20, backgroundColor: const Color(0xFFEDEBFF), backgroundImage: user?.avatarUrl != null ? NetworkImage(user!.avatarUrl!) : null, child: user?.avatarUrl == null ? const Icon(Icons.person, size: 24, color: Color(0xFF635BFF)) : null),
         )),
-        const SizedBox(width: 12),
+        const SizedBox(width: 10),
         Expanded(child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
-          Row(mainAxisSize: MainAxisSize.min, children: [Icon(Icons.smart_toy_outlined, size: 18, color: const Color(0xFF635BFF)), const SizedBox(width: 4), Text('AI 健康管家', style: TextStyle(fontSize: 14, fontWeight: FontWeight.w500, color: Colors.grey[600]))]),
+          Row(mainAxisSize: MainAxisSize.min, children: [Icon(Icons.smart_toy_outlined, size: 16, color: const Color(0xFF635BFF)), const SizedBox(width: 4), Text('AI 健康管家', style: TextStyle(fontSize: 13, fontWeight: FontWeight.w500, color: Colors.grey[600]))]),
           const SizedBox(height: 2),
-          Text('${_getGreeting()}，${user?.name ?? '张三'}！', style: const TextStyle(fontSize: 18, fontWeight: FontWeight.bold, color: Color(0xFF1A1A1A))),
+          Text('${_getGreeting()}，${user?.name ?? '张三'}！', style: const TextStyle(fontSize: 17, fontWeight: FontWeight.bold, color: Color(0xFF1A1A1A))),
         ])),
-        Icon(Icons.notifications_none, size: 24, color: Colors.grey[600]),
+        Icon(Icons.notifications_none, size: 22, color: Colors.grey[600]),
       ]),
     );
   }
@@ -88,35 +94,56 @@ class _HomePageState extends ConsumerState<HomePage> {
     return '晚上好';
   }
 
-  Widget _buildExpandButton() {
-    if (!_showExpandButton || _taskCardsExpanded) return const SizedBox.shrink();
-    return Positioned(top: 60, right: 16, child: AnimatedOpacity(opacity: _showExpandButton ? 1.0 : 0.0, duration: const Duration(milliseconds: 300), child: FloatingActionButton(onPressed: () => setState(() => _taskCardsExpanded = true), mini: true, backgroundColor: const Color(0xFF635BFF), child: const Icon(Icons.keyboard_arrow_down, size: 20))));
-  }
+  // ═════════════════════ 今日任务（可折叠/展开） ═════════════════════
 
-  Widget _buildTaskCards() {
+  Widget _buildTaskCardsArea() {
     final latestHealth = ref.watch(latestHealthProvider);
 
-    return latestHealth.when(
-      data: (data) => Container(
-        margin: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
-        padding: const EdgeInsets.all(16),
-        decoration: BoxDecoration(color: Colors.white, borderRadius: BorderRadius.circular(20), boxShadow: [BoxShadow(color: const Color(0xFF635BFF).withAlpha(10), blurRadius: 8, offset: const Offset(0, 2))]),
-        child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
-          Row(children: [Text('今日任务', style: const TextStyle(fontSize: 16, fontWeight: FontWeight.w600, color: Color(0xFF1A1A1A))), const Spacer(), GestureDetector(onTap: () => setState(() => _taskCardsExpanded = false), child: Text('全部展开', style: TextStyle(fontSize: 13, color: const Color(0xFF635BFF))))]),
-          const SizedBox(height: 12), ..._getTodayTasks(data),
+    if (_taskCardsExpanded) {
+      return latestHealth.when(
+        data: (data) => _taskCardContent(data),
+        loading: () => _taskCardContent({}),
+        error: (_, __) => _taskCardContent({}),
+      );
+    }
+
+    // 折叠状态：只显示一行可点击的标题栏
+    return GestureDetector(
+      onTap: () => setState(() => _taskCardsExpanded = true),
+      behavior: HitTestBehavior.opaque,
+      child: Container(
+        margin: const EdgeInsets.symmetric(horizontal: 16, vertical: 6),
+        padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
+        decoration: BoxDecoration(color: Colors.white, borderRadius: BorderRadius.circular(16), boxShadow: [BoxShadow(color: const Color(0xFF635BFF).withAlpha(8), blurRadius: 6, offset: const Offset(0, 1))]),
+        child: Row(children: [
+          Icon(Icons.assignment_turned_in_outlined, size: 18, color: const Color(0xFF635BFF)),
+          const SizedBox(width: 8),
+          const Text('今日任务', style: TextStyle(fontSize: 15, fontWeight: FontWeight.w600, color: Color(0xFF1A1A1A))),
+          const Spacer(),
+          Text('点击展开', style: TextStyle(fontSize: 12, color: const Color(0xFF635BFF))),
+          Icon(Icons.keyboard_arrow_right, size: 18, color: const Color(0xFF635BFF)),
         ]),
       ),
-      loading: () => const SizedBox.shrink(),
-      error: (_, __) => Container(
-        margin: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
-        padding: const EdgeInsets.all(16),
-        decoration: BoxDecoration(color: Colors.white, borderRadius: BorderRadius.circular(20), boxShadow: [BoxShadow(color: const Color(0xFF635BFF).withAlpha(10), blurRadius: 8, offset: const Offset(0, 2))]),
-        child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
-          Row(children: [const Text('今日任务', style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600, color: Color(0xFF1A1A1A))), const Spacer(), GestureDetector(onTap: () => setState(() => _taskCardsExpanded = false), child: Text('全部展开', style: TextStyle(fontSize: 13, color: const Color(0xFF635BFF))))]),
-          const SizedBox(height: 12), ..._getTodayTasks({}),
-        ],
-      ),
-    ),
+    );
+  }
+
+  Widget _taskCardContent(Map<String, dynamic> healthData) {
+    return Container(
+      margin: const EdgeInsets.symmetric(horizontal: 16, vertical: 6),
+      padding: const EdgeInsets.all(14),
+      decoration: BoxDecoration(color: Colors.white, borderRadius: BorderRadius.circular(16), boxShadow: [BoxShadow(color: const Color(0xFF635BFF).withAlpha(8), blurRadius: 6, offset: const Offset(0, 1))]),
+      child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
+        Row(children: [
+          const Text('今日任务', style: TextStyle(fontSize: 15, fontWeight: FontWeight.w600, color: Color(0xFF1A1A1A))),
+          const Spacer(),
+          GestureDetector(onTap: () => setState(() => _taskCardsExpanded = false), child: Row(mainAxisSize: MainAxisSize.min, children: [
+            Text('收起', style: TextStyle(fontSize: 12, color: const Color(0xFF999999))),
+            Icon(Icons.keyboard_arrow_up, size: 18, color: const Color(0xFF999999)),
+          ])),
+        ]),
+        const SizedBox(height: 10),
+        ..._getTodayTasks(healthData),
+      ]),
     );
   }
 
@@ -140,14 +167,14 @@ class _HomePageState extends ConsumerState<HomePage> {
     final colors = {'done': const Color(0xFF43A047), 'warning': const Color(0xFFFF9800), 'pending': const Color(0xFF9E9E9E)};
     final icons = {'done': Icons.check_circle, 'warning': Icons.warning, 'pending': Icons.circle_outlined};
     return Padding(
-      padding: const EdgeInsets.only(bottom: 12),
+      padding: const EdgeInsets.only(bottom: 10),
       child: GestureDetector(
         behavior: HitTestBehavior.opaque,
         onTap: onTap,
         child: Row(children: [
-          Container(width: 32, height: 32, decoration: BoxDecoration(color: const Color(0xFFF5F3FF), borderRadius: BorderRadius.circular(8)), child: Icon(icon, size: 16, color: const Color(0xFF635BFF))),
-          const SizedBox(width: 10), Expanded(child: Text(label, style: const TextStyle(fontSize: 14, color: Color(0xFF333333)))),
-          Icon(icons[status], size: 20, color: colors[status] ?? Colors.grey),
+          Container(width: 30, height: 30, decoration: BoxDecoration(color: const Color(0xFFF5F3FF), borderRadius: BorderRadius.circular(8)), child: Icon(icon, size: 15, color: const Color(0xFF635BFF))),
+          const SizedBox(width: 10), Expanded(child: Text(label, style: const TextStyle(fontSize: 13, color: Color(0xFF333333)))),
+          Icon(icons[status], size: 18, color: colors[status] ?? Colors.grey),
         ]),
       ),
     );
@@ -155,73 +182,139 @@ class _HomePageState extends ConsumerState<HomePage> {
 
   void _handleMedicationCheck() async {
     await ref.read(medicationServiceProvider).confirm('');
+    if (!mounted) return;
     ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('已记录服药 ✅'), backgroundColor: Color(0xFF635BFF)));
   }
 
+  // ═════════════════════ 智能体选择条（常驻） ═════════════════════
+
+  static final _agentDefs = [
+    (ActiveAgent.consultation, '问诊', Icons.chat_bubble_outline),
+    (ActiveAgent.health, '记数据', Icons.favorite_border),
+    (ActiveAgent.diet, '拍饮食', Icons.restaurant_outlined),
+    (ActiveAgent.medication, '药管家', Icons.medication_outlined),
+    (ActiveAgent.report, '看报告', Icons.description_outlined),
+    (ActiveAgent.exercise, '运动', Icons.directions_run_outlined),
+  ];
+
+  Widget _buildAgentBar(ActiveAgent? selected) {
+    return Container(
+      height: 44,
+      padding: const EdgeInsets.symmetric(horizontal: 12),
+      child: ListView.separated(
+        scrollDirection: Axis.horizontal,
+        itemCount: _agentDefs.length,
+        separatorBuilder: (_, __) => const SizedBox(width: 6),
+        itemBuilder: (_, i) {
+          final (agent, label, icon) = _agentDefs[i];
+          final isActive = selected == agent;
+          return GestureDetector(
+            onTap: () {
+              final notifier = ref.read(selectedAgentProvider.notifier);
+              notifier.select(isActive ? null : agent);
+              // 切换智能体时清空聊天
+              if (!isActive) ref.read(chatProvider.notifier).setAgent(agent);
+            },
+            child: Container(
+              padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
+              decoration: BoxDecoration(
+                color: isActive ? const Color(0xFF635BFF) : Colors.white,
+                borderRadius: BorderRadius.circular(20),
+                border: Border.all(color: isActive ? const Color(0xFF635BFF) : const Color(0xFFE0E0E0)),
+              ),
+              child: Row(mainAxisSize: MainAxisSize.min, children: [
+                Icon(icon, size: 14, color: isActive ? Colors.white : const Color(0xFF666666)),
+                const SizedBox(width: 4),
+                Text(label, style: TextStyle(fontSize: 12, fontWeight: isActive ? FontWeight.w600 : FontWeight.w500, color: isActive ? Colors.white : const Color(0xFF666666))),
+              ]),
+            ),
+          );
+        },
+      ),
+    );
+  }
+
+  // ═════════════════════ 智能体操作面板（选中后显示） ═════════════════════
+
   Widget _buildAgentPanel(BuildContext context, ActiveAgent agent) {
     final titles = {ActiveAgent.consultation: 'AI 问诊', ActiveAgent.health: '记数据', ActiveAgent.diet: '拍饮食', ActiveAgent.medication: '药管家', ActiveAgent.report: '看报告', ActiveAgent.exercise: '运动计划'};
     final tips = {ActiveAgent.consultation: '或直接对我说你的症状', ActiveAgent.health: '或直接对我说："血压 135/85"', ActiveAgent.diet: '或直接对我说："中午吃了牛肉面"', ActiveAgent.medication: '或直接对我说："医生让我吃阿托伐他汀 20mg"', ActiveAgent.report: '或直接上传报告图片', ActiveAgent.exercise: '或直接对我说："每周一三五散步 30 分钟"'};
 
-    return AnimatedContainer(duration: const Duration(milliseconds: 300), curve: Curves.easeInOut, padding: const EdgeInsets.all(16), decoration: BoxDecoration(color: Colors.white, borderRadius: const BorderRadius.vertical(top: Radius.circular(24)), boxShadow: [BoxShadow(color: const Color(0xFF635BFF).withAlpha(15), blurRadius: 12, offset: const Offset(0, -4))]), child: Column(mainAxisSize: MainAxisSize.min, children: [
-      Text(titles[agent] ?? '', style: const TextStyle(fontSize: 16, fontWeight: FontWeight.w600, color: Color(0xFF1A1A1A))),
-      const SizedBox(height: 4), Text(tips[agent] ?? '', style: TextStyle(fontSize: 12, color: Colors.grey[500])),
-      const SizedBox(height: 12), Wrap(spacing: 8, runSpacing: 8, children: _getAgentButtons(agent)),
-    ]));
+    return Container(
+      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
+      decoration: BoxDecoration(color: Colors.white, border: Border(top: BorderSide(color: const Color(0xFFEEEEEE)))),
+      child: Column(mainAxisSize: MainAxisSize.min, children: [
+        Row(children: [
+          Text(titles[agent] ?? '', style: const TextStyle(fontSize: 14, fontWeight: FontWeight.w600, color: Color(0xFF1A1A1A))),
+          const SizedBox(width: 6),
+          Expanded(child: Text(tips[agent] ?? '', style: TextStyle(fontSize: 11, color: Colors.grey[500]))),
+          GestureDetector(onTap: () => ref.read(selectedAgentProvider.notifier).select(null), child: Icon(Icons.close, size: 18, color: Colors.grey[400])),
+        ]),
+        const SizedBox(height: 8),
+        SingleChildScrollView(scrollDirection: Axis.horizontal, child: Row(children: _getAgentButtons(agent))),
+      ]));
   }
 
   List<Widget> _getAgentButtons(ActiveAgent agent) {
     switch (agent) {
-      case ActiveAgent.health: return [_agentBtn('手动录入血压', Icons.favorite), _agentBtn('手动录入血糖', Icons.bloodtype), _agentBtn('手动录入心率', Icons.monitor_heart), _agentBtn('手动录入血氧', Icons.air), _agentBtn('手动录入体重', Icons.monitor_weight)];
-      case ActiveAgent.diet: return [_agentBtn('拍照', Icons.camera_alt), _agentBtn('上传照片', Icons.photo_library)];
+      case ActiveAgent.health: return [_agentBtn('录入血压', Icons.favorite), _agentBtn('录入血糖', Icons.bloodtype), _agentBtn('录入心率', Icons.monitor_heart), _agentBtn('录入血氧', Icons.air), _agentBtn('录入体重', Icons.monitor_weight)];
+      case ActiveAgent.diet: return [_agentBtn('拍照识别', Icons.camera_alt), _agentBtn('上传照片', Icons.photo_library)];
       case ActiveAgent.medication: return [_agentBtn('用药管理', Icons.medication), _agentBtn('用药提醒', Icons.alarm)];
       case ActiveAgent.consultation: return [_agentBtn('找医生', Icons.person_search)];
-      case ActiveAgent.exercise: return [_agentBtn('本周计划', Icons.calendar_view_week), _agentBtn('创建新计划', Icons.add_circle_outline)];
+      case ActiveAgent.exercise: return [_agentBtn('本周计划', Icons.calendar_view_week), _agentBtn('新建计划', Icons.add_circle_outline)];
       default: return [];
     }
   }
 
   Widget _agentBtn(String label, IconData icon) {
-    return ElevatedButton.icon(
-      onPressed: () => _onAgentAction(label),
-      icon: Icon(icon, size: 16),
-      label: Text(label, style: const TextStyle(fontSize: 13)),
-      style: ElevatedButton.styleFrom(backgroundColor: const Color(0xFFF5F3FF), foregroundColor: const Color(0xFF635BFF), elevation: 0, shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(18)), padding: const EdgeInsets.symmetric(vertical: 10, horizontal: 14)),
+    return Padding(
+      padding: const EdgeInsets.only(right: 8),
+      child: ElevatedButton.icon(
+        onPressed: () => _onAgentAction(label),
+        icon: Icon(icon, size: 14),
+        label: Text(label, style: const TextStyle(fontSize: 12)),
+        style: ElevatedButton.styleFrom(backgroundColor: const Color(0xFFF5F3FF), foregroundColor: const Color(0xFF635BFF), elevation: 0, shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)), padding: const EdgeInsets.symmetric(vertical: 8, horizontal: 12)),
+      ),
     );
   }
 
   void _onAgentAction(String label) {
     switch (label) {
-      case '拍照': case '上传照片': pushRoute(ref, 'dietCapture');
-      case '手动录入血压': _textCtrl.text = '血压 ';
-      case '手动录入血糖': _textCtrl.text = '血糖 ';
-      case '手动录入心率': _textCtrl.text = '心率 ';
-      case '手动录入血氧': _textCtrl.text = '血氧 ';
-      case '手动录入体重': _textCtrl.text = '体重 ';
+      case '拍照识别': case '上传照片': pushRoute(ref, 'dietCapture');
+      case '录入血压': _textCtrl.text = '血压 ';
+      case '录入血糖': _textCtrl.text = '血糖 ';
+      case '录入心率': _textCtrl.text = '心率 ';
+      case '录入血氧': _textCtrl.text = '血氧 ';
+      case '录入体重': _textCtrl.text = '体重 ';
       case '用药管理': pushRoute(ref, 'medications');
       case '找医生': pushRoute(ref, 'doctors');
-      case '本周计划': case '创建新计划': pushRoute(ref, 'exercisePlan');
+      case '本周计划': case '新建计划': pushRoute(ref, 'exercisePlan');
     }
   }
 
   Future<void> _pickImage(ImageSource source) async {
     final picker = ImagePicker();
     final picked = await picker.pickImage(source: source, imageQuality: 85);
-    if (picked != null) { final token = await ref.read(apiClientProvider).accessToken; if (token == null) return; _textCtrl.text = '[图片已上传]'; setState(() {}); }
+    if (picked != null) { final token = await ref.read(apiClientProvider).accessToken; if (token == null) return; _textCtrl.text = '[图片已上传]'; if (mounted) setState(() {}); }
   }
 
   void _showAttachmentPicker(BuildContext context) {
     showModalBottomSheet(context: context, builder: (ctx) => SafeArea(child: Wrap(children: [
       ListTile(leading: const Icon(Icons.camera_alt), title: const Text('拍照'), onTap: () { Navigator.pop(ctx); _pickImage(ImageSource.camera); }),
       ListTile(leading: const Icon(Icons.photo_library), title: const Text('从相册选'), onTap: () { Navigator.pop(ctx); _pickImage(ImageSource.gallery); }),
-      ListTile(leading: const Icon(Icons.attach_file), title: const Text('传文件'), onTap: () async { Navigator.pop(ctx); final result = await FilePicker.platform.pickFiles(); if (result != null && result.files.isNotEmpty) { _textCtrl.text = '[文件已选择] ${result.files.first.name}'; setState(() {}); }}),
+      ListTile(leading: const Icon(Icons.attach_file), title: const Text('传文件'), onTap: () async { Navigator.pop(ctx); final result = await FilePicker.platform.pickFiles(); if (result != null && result.files.isNotEmpty) { _textCtrl.text = '[文件已选择] ${result.files.first.name}'; if (mounted) setState(() {}); }}),
     ])));
   }
 
   Widget _buildInputBar(BuildContext context) {
-    return Container(padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8), decoration: BoxDecoration(color: Colors.white, border: Border(top: BorderSide(color: const Color(0xFFEEEEEE)))), child: Row(children: [
-      IconButton(icon: const Icon(Icons.attach_file, size: 24, color: Color(0xFF666666)), onPressed: () => _showAttachmentPicker(context)),
-      Expanded(child: TextField(controller: _textCtrl, decoration: InputDecoration(hintText: '输入你想说的...', contentPadding: const EdgeInsets.symmetric(horizontal: 12), border: InputBorder.none), onSubmitted: (_) => _sendMessage())),
-      IconButton(icon: const Icon(Icons.send, size: 24, color: Color(0xFF635BFF)), onPressed: _sendMessage),
-    ]));
+    return Container(
+      padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 6),
+      decoration: BoxDecoration(color: Colors.white, border: Border(top: BorderSide(color: const Color(0xFFEEEEEE)))),
+      child: Row(children: [
+        IconButton(icon: const Icon(Icons.attach_file, size: 22, color: Color(0xFF666666)), onPressed: () => _showAttachmentPicker(context)),
+        Expanded(child: TextField(controller: _textCtrl, decoration: InputDecoration(hintText: '输入你想说的...', contentPadding: const EdgeInsets.symmetric(horizontal: 10), border: InputBorder.none, isDense: true), onSubmitted: (_) => _sendMessage())),
+        IconButton(icon: const Icon(Icons.send, size: 22, color: Color(0xFF635BFF)), onPressed: _sendMessage),
+      ]),
+    );
   }
 }

health_app/lib/widgets/health_drawer.dart

@@ -75,24 +75,22 @@ class HealthDrawer extends ConsumerWidget {
                 TextButton(onPressed: () => ref.invalidate(conversationListProvider), child: const Text('刷新', style: TextStyle(fontSize: 12, color: Color(0xFF635BFF)))),
               ]),
             ),
-            SizedBox(
-              height: 200,
-              child: conversations.when(
+            conversations.when(
                 data: (items) {
                   if (items.isEmpty) {
-                    return const Center(child: Text('暂无历史对话', style: TextStyle(color: Color(0xFF999999), fontSize: 14)));
+                    return const Padding(padding: EdgeInsets.symmetric(vertical: 20), child: Center(child: Text('暂无历史对话', style: TextStyle(color: Color(0xFF999999), fontSize: 13))));
                   }
-                  return ListView.builder(
-                    shrinkWrap: true,
+                  return Padding(
                     padding: const EdgeInsets.symmetric(horizontal: 8),
-                    itemCount: items.length,
-                    itemBuilder: (ctx, i) => _ConversationItem(item: items[i], ref: ref),
+                    child: Column(
+                      mainAxisSize: MainAxisSize.min,
+                      children: items.map((item) => _ConversationItem(item: item, ref: ref)).toList(),
+                    ),
                   );
                 },
                 loading: () => const Center(child: CircularProgressIndicator(strokeWidth: 2)),
                 error: (_, __) => const Center(child: Text('加载失败', style: TextStyle(color: Color(0xFF999999), fontSize: 14))),
               ),
-            ),
 
             const Divider(),
             _DrawerItem(icon: Icons.logout, label: '退出登录', onTap: () async {
@@ -149,30 +147,31 @@ class _ConversationItem extends ConsumerWidget {
   @override
   Widget build(BuildContext context, WidgetRef ref) {
     return Container(
-      margin: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
+      margin: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
       decoration: BoxDecoration(
         color: const Color(0xFFF8F7FF),
-        borderRadius: BorderRadius.circular(12),
+        borderRadius: BorderRadius.circular(10),
       ),
       child: ListTile(
         leading: Container(
-          width: 40,
-          height: 40,
+          width: 36,
+          height: 36,
           decoration: BoxDecoration(
             color: const Color(0xFFEDEBFF),
-            borderRadius: BorderRadius.circular(10),
+            borderRadius: BorderRadius.circular(8),
           ),
-          child: Icon(_getAgentIcon(item.agent), size: 18, color: const Color(0xFF635BFF)),
+          child: Icon(_getAgentIcon(item.agent), size: 16, color: const Color(0xFF635BFF)),
         ),
-        title: Text(item.title, maxLines: 1, overflow: TextOverflow.ellipsis, style: const TextStyle(fontSize: 14, fontWeight: FontWeight.w500)),
-        subtitle: Text(item.lastMessage, maxLines: 1, overflow: TextOverflow.ellipsis, style: TextStyle(fontSize: 12, color: Colors.grey[500])),
+        title: Text(item.title, maxLines: 1, overflow: TextOverflow.ellipsis, style: const TextStyle(fontSize: 13, fontWeight: FontWeight.w500)),
+        subtitle: Text(item.lastMessage, maxLines: 1, overflow: TextOverflow.ellipsis, style: TextStyle(fontSize: 11, color: Colors.grey[500])),
         trailing: Column(
           mainAxisAlignment: MainAxisAlignment.center,
+          mainAxisSize: MainAxisSize.min,
           children: [
-            Text(_formatTime(item.updatedAt), style: const TextStyle(fontSize: 10, color: Color(0xFFCCCCCC))),
-            const SizedBox(height: 4),
+            Text(_formatTime(item.updatedAt), style: const TextStyle(fontSize: 9, color: Color(0xFFCCCCCC))),
+            const SizedBox(height: 2),
             PopupMenuButton<int>(
-              icon: const Icon(Icons.more_vert, size: 16, color: Color(0xFFCCCCCC)),
+              icon: const Icon(Icons.more_vert, size: 14, color: Color(0xFFCCCCCC)),
               itemBuilder: (_) => [
                 const PopupMenuItem(value: 1, child: Text('继续聊')),
                 const PopupMenuItem(value: 2, child: Text('删除')),