refactor: 死代码清理 + 趋势图重构 + 侧边栏交互优化 + 智能体卡片去延迟

- 死代码清理: 删除 AppCard/AppMenuItem/AppTabChip/AppButtons 等 4 个未使用 Widget 文件; 清理 common_widgets/enterprise_widgets/app_status_badge 中未使用 class; 移除 HealthService 等未使用方法; 后端移除 ExerciseService.CreateFromItemsAsync/HealthArchiveService.GetOrCreateAsync/MedicationAgentHandler 死分支/ChatRequest DTO
- 趋势图: 直线折线 + 渐变填充 + 阴影; 去网格; X 轴日+月份; Y 轴整数刻度最多 4 个; 点击数据点/录入记录显示上方浮层; 选中点变实心
- 侧边栏: 对话记录改单选删除(灰底高亮); 操作栏浮层修复触摸问题; 常用功能/健康仪表盘间距收紧; _Panel 去外框
- 智能体: 欢迎卡片去掉 400ms 延迟; 胶囊去阴影
- 其他: api_client IP 适配; 多页面 UI 微调; 新增 chat_provider/prelaunch_guardrails 测试

health_app/lib/pages/home/home_page.dart

@@ -78,7 +78,7 @@ class _HomePageState extends ConsumerState<HomePage>
     final imagePath = _pickedImagePath;
     if (text.isEmpty && imagePath == null) return;
     _textCtrl.clear();
-    _focusNode.unfocus();
+    _dismissKeyboard();
     setState(() => _pickedImagePath = null);
     if (imagePath != null) {
       ref.read(chatProvider.notifier).sendImage(imagePath, text);
@@ -145,9 +145,9 @@ class _HomePageState extends ConsumerState<HomePage>
                     left: 0,
                     top: 0,
                     bottom: 0,
-                    width: 44,
+                    width: MediaQuery.sizeOf(context).width * 0.8,
                     child: GestureDetector(
-                      behavior: HitTestBehavior.opaque,
+                      behavior: HitTestBehavior.translucent,
                       onHorizontalDragStart: (details) {
                         _drawerDragStartX = details.globalPosition.dx;
                       },
@@ -255,16 +255,20 @@ class _HomePageState extends ConsumerState<HomePage>
   ];
 
   Widget _buildAgentBar() {
+    final activeAgent = ref.watch(
+      chatProvider.select((state) => state.activeAgent),
+    );
     return SizedBox(
-      height: 42,
+      height: 46,
       child: ListView.separated(
         scrollDirection: Axis.horizontal,
-        padding: const EdgeInsets.symmetric(horizontal: 14),
+        padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 2),
         itemCount: _agentDefs.length,
         separatorBuilder: (_, _) => const SizedBox(width: 8),
         itemBuilder: (_, i) {
           final agent = _agentDefs[i];
           final visual = _agentVisual(agent);
+          final selected = activeAgent == agent;
           return GestureDetector(
             onTap: () => ref
                 .read(chatProvider.notifier)
@@ -272,9 +276,14 @@ class _HomePageState extends ConsumerState<HomePage>
             child: Container(
               padding: const EdgeInsets.symmetric(horizontal: 13, vertical: 9),
               decoration: BoxDecoration(
-                color: Colors.white.withValues(alpha: 0.86),
+                color: Colors.white,
                 borderRadius: BorderRadius.circular(999),
-                border: Border.all(color: Colors.white, width: 1.2),
+                border: Border.all(
+                  color: selected
+                      ? AppColors.auraIndigo.withValues(alpha: 0.42)
+                      : const Color(0xFFD5DAE4),
+                  width: selected ? 1.4 : 1.1,
+                ),
               ),
               child: Row(
                 mainAxisSize: MainAxisSize.min,
@@ -477,6 +486,7 @@ class _HomePageState extends ConsumerState<HomePage>
   }
 
   void _showAttachmentPicker(BuildContext context) {
+    _dismissKeyboard();
     showModalBottomSheet(
       context: context,
       backgroundColor: Colors.white,
@@ -496,6 +506,7 @@ class _HomePageState extends ConsumerState<HomePage>
                 title: const Text('拍照'),
                 onTap: () {
                   Navigator.pop(ctx);
+                  _dismissKeyboard();
                   _pickImage(ImageSource.camera);
                 },
               ),
@@ -507,6 +518,7 @@ class _HomePageState extends ConsumerState<HomePage>
                 title: const Text('从相册选择'),
                 onTap: () {
                   Navigator.pop(ctx);
+                  _dismissKeyboard();
                   _pickImage(ImageSource.gallery);
                 },
               ),
@@ -518,6 +530,7 @@ class _HomePageState extends ConsumerState<HomePage>
                 title: const Text('上传 PDF'),
                 onTap: () async {
                   Navigator.pop(ctx);
+                  _dismissKeyboard();
                   final result = await FilePicker.platform.pickFiles(
                     type: FileType.custom,
                     allowedExtensions: ['pdf'],
@@ -532,6 +545,7 @@ class _HomePageState extends ConsumerState<HomePage>
                       .read(chatProvider.notifier)
                       .sendPdf(path, pdfFile.name, _textCtrl.text.trim());
                   _textCtrl.clear();
+                  _dismissKeyboard();
                   if (mounted) setState(() {});
                 },
               ),
@@ -543,17 +557,25 @@ class _HomePageState extends ConsumerState<HomePage>
   }
 
   Future<void> _pickImage(ImageSource source) async {
+    _dismissKeyboard();
     final picked = await ImagePicker().pickImage(
       source: source,
       imageQuality: 85,
     );
+    _dismissKeyboard();
     if (picked != null) {
       final token = await ref.read(apiClientProvider).accessToken;
       if (token == null) return;
       setState(() => _pickedImagePath = picked.path);
+      WidgetsBinding.instance.addPostFrameCallback((_) => _dismissKeyboard());
     }
   }
 
+  void _dismissKeyboard() {
+    _focusNode.unfocus();
+    FocusManager.instance.primaryFocus?.unfocus();
+  }
+
   Future<void> _pickFoodImage(ImageSource source) async {
     final picked = await ImagePicker().pickImage(
       source: source,