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/notifications/notification_center_page.dart

@@ -3,6 +3,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:shadcn_ui/shadcn_ui.dart';
 
 import '../../core/app_colors.dart';
+import '../../core/app_design_tokens.dart';
 import '../../core/app_module_visuals.dart';
 import '../../core/app_theme.dart';
 import '../../core/navigation_provider.dart';
@@ -240,7 +241,12 @@ class _NotificationCenterPageState
         if (today.isNotEmpty) ...[
           const _SectionTitle('今天'),
           const SizedBox(height: 10),
-          ...today.map(_buildDismissible),
+          _NotificationGroup(
+            children: [
+              for (var i = 0; i < today.length; i++)
+                _buildDismissible(today[i], showDivider: i < today.length - 1),
+            ],
+          ),
         ],
         if (earlier.isNotEmpty) ...[
           if (today.isNotEmpty) const SizedBox(height: 18),
@@ -251,49 +257,81 @@ class _NotificationCenterPageState
             onTap: () => setState(() => _showEarlier = !_showEarlier),
           ),
           const SizedBox(height: 10),
-          if (_showEarlier) ...earlier.map(_buildDismissible),
+          if (_showEarlier)
+            _NotificationGroup(
+              children: [
+                for (var i = 0; i < earlier.length; i++)
+                  _buildDismissible(
+                    earlier[i],
+                    showDivider: i < earlier.length - 1,
+                  ),
+              ],
+            ),
         ],
       ],
     );
   }
 
-  Widget _buildDismissible(InAppNotification item) => Padding(
-    padding: const EdgeInsets.only(bottom: 12),
-    child: Dismissible(
-      key: ValueKey(item.id),
-      direction: DismissDirection.endToStart,
-      background: Container(
-        alignment: Alignment.centerRight,
-        padding: const EdgeInsets.only(right: 26),
-        decoration: BoxDecoration(
-          color: AppColors.error,
-          borderRadius: BorderRadius.circular(16),
-        ),
-        child: const Row(
-          mainAxisSize: MainAxisSize.min,
-          children: [
-            Icon(LucideIcons.trash2, color: Colors.white, size: 22),
-            SizedBox(width: 8),
-            Text(
-              '删除',
-              style: TextStyle(
-                color: Colors.white,
-                fontSize: 15,
-                fontWeight: FontWeight.w700,
-              ),
+  Widget _buildDismissible(
+    InAppNotification item, {
+    required bool showDivider,
+  }) => Dismissible(
+    key: ValueKey(item.id),
+    direction: DismissDirection.endToStart,
+    background: Container(
+      alignment: Alignment.centerRight,
+      padding: const EdgeInsets.only(right: 26),
+      color: AppColors.error,
+      child: const Row(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          Icon(LucideIcons.trash2, color: Colors.white, size: 22),
+          SizedBox(width: 8),
+          Text(
+            '删除',
+            style: TextStyle(
+              color: Colors.white,
+              fontSize: 15,
+              fontWeight: FontWeight.w700,
             ),
-          ],
-        ),
-      ),
-      onDismissed: (_) => _delete(item),
-      child: SizedBox(
-        height: 98,
-        child: _NotificationCard(item: item, onTap: () => _open(item)),
+          ),
+        ],
       ),
     ),
+    onDismissed: (_) => _delete(item),
+    child: _NotificationRow(
+      item: item,
+      showDivider: showDivider,
+      onTap: () => _open(item),
+    ),
   );
 }
 
+class _NotificationGroup extends StatelessWidget {
+  final List<Widget> children;
+
+  const _NotificationGroup({required this.children});
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      clipBehavior: Clip.antiAlias,
+      decoration: BoxDecoration(
+        color: Colors.white,
+        borderRadius: AppRadius.xlBorder,
+        boxShadow: [
+          BoxShadow(
+            color: const Color(0xFF101828).withValues(alpha: 0.035),
+            blurRadius: 14,
+            offset: const Offset(0, 6),
+          ),
+        ],
+      ),
+      child: Column(children: children),
+    );
+  }
+}
+
 class _UnreadHint extends StatelessWidget {
   final int unreadCount;
 
@@ -305,7 +343,7 @@ class _UnreadHint extends StatelessWidget {
     padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 11),
     decoration: BoxDecoration(
       color: const Color(0xFFFFFBEB),
-      borderRadius: BorderRadius.circular(14),
+      borderRadius: AppRadius.mdBorder,
       border: Border.all(color: const Color(0xFFFDE68A)),
     ),
     child: Row(
@@ -359,23 +397,8 @@ class _SectionShell extends StatelessWidget {
   const _SectionShell({required this.child});
 
   @override
-  Widget build(BuildContext context) => Container(
-    margin: const EdgeInsets.fromLTRB(0, 6, 0, 2),
-    padding: const EdgeInsets.symmetric(horizontal: 13, vertical: 10),
-    decoration: BoxDecoration(
-      color: Colors.white,
-      borderRadius: BorderRadius.circular(14),
-      border: Border.all(color: AppColors.borderLight),
-      boxShadow: [
-        BoxShadow(
-          color: const Color(0xFF101828).withValues(alpha: 0.035),
-          blurRadius: 10,
-          offset: const Offset(0, 4),
-        ),
-      ],
-    ),
-    child: child,
-  );
+  Widget build(BuildContext context) =>
+      Padding(padding: const EdgeInsets.fromLTRB(2, 12, 2, 8), child: child);
 }
 
 class _CollapsibleSectionTitle extends StatelessWidget {
@@ -433,38 +456,31 @@ class _CollapsibleSectionTitle extends StatelessWidget {
   );
 }
 
-class _NotificationCard extends StatelessWidget {
+class _NotificationRow extends StatelessWidget {
   final InAppNotification item;
+  final bool showDivider;
   final VoidCallback onTap;
 
-  const _NotificationCard({required this.item, required this.onTap});
+  const _NotificationRow({
+    required this.item,
+    required this.showDivider,
+    required this.onTap,
+  });
 
   @override
   Widget build(BuildContext context) {
     final visual = _NotificationVisual.of(item);
     return Material(
       color: Colors.white,
-      borderRadius: BorderRadius.circular(16),
       child: InkWell(
         onTap: onTap,
-        borderRadius: BorderRadius.circular(16),
         child: Container(
-          height: 98,
-          decoration: BoxDecoration(
-            color: Colors.white,
-            borderRadius: BorderRadius.circular(16),
-            border: Border.all(
-              color: item.isRead
-                  ? AppColors.borderLight
-                  : visual.color.withValues(alpha: 0.32),
-              width: 1.1,
-            ),
-            boxShadow: [AppTheme.shadowLight],
-          ),
-          child: Stack(
+          constraints: const BoxConstraints(minHeight: 94),
+          color: Colors.white,
+          child: Column(
             children: [
               Padding(
-                padding: const EdgeInsets.fromLTRB(14, 13, 12, 13),
+                padding: const EdgeInsets.fromLTRB(14, 13, 12, 12),
                 child: Row(
                   children: [
                     Stack(
@@ -482,7 +498,7 @@ class _NotificationCard extends StatelessWidget {
                                 visual.lightColor,
                               ],
                             ),
-                            borderRadius: BorderRadius.circular(14),
+                            borderRadius: AppRadius.mdBorder,
                             border: Border.all(
                               color: visual.color.withValues(alpha: 0.22),
                             ),
@@ -527,7 +543,7 @@ class _NotificationCard extends StatelessWidget {
                                 ),
                                 decoration: BoxDecoration(
                                   color: visual.lightColor,
-                                  borderRadius: BorderRadius.circular(999),
+                                  borderRadius: AppRadius.pillBorder,
                                 ),
                                 child: Text(
                                   visual.label,
@@ -589,6 +605,15 @@ class _NotificationCard extends StatelessWidget {
                   ],
                 ),
               ),
+              if (showDivider)
+                const Padding(
+                  padding: EdgeInsets.only(left: 75),
+                  child: Divider(
+                    height: 1,
+                    thickness: 0.7,
+                    color: Color(0xFFE8ECF2),
+                  ),
+                ),
             ],
           ),
         ),