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/widgets/common_widgets.dart

@@ -1,117 +1,13 @@
 import 'package:flutter/material.dart';
+
 import '../core/app_colors.dart';
 
-/// 渐变边框按钮（白色底+彩色渐变边框）
-class GradientBorderButton extends StatelessWidget {
-  final String text;
-  final IconData? icon;
-  final VoidCallback? onTap;
-  final double height;
-  final bool isSuccess;
-
-  const GradientBorderButton({
-    super.key,
-    required this.text,
-    this.icon,
-    this.onTap,
-    this.height = 52,
-    this.isSuccess = false,
-  });
-
-  @override
-  Widget build(BuildContext context) {
-    return Container(
-      height: height,
-      decoration: BoxDecoration(
-        gradient: isSuccess
-            ? AppColors.calmHealthGradient
-            : AppColors.primaryGradient,
-        borderRadius: BorderRadius.circular(14),
-        boxShadow: AppColors.buttonShadow,
-      ),
-      child: Material(
-        color: Colors.transparent,
-        child: InkWell(
-          onTap: onTap,
-          borderRadius: BorderRadius.circular(14),
-          child: Row(
-            mainAxisAlignment: MainAxisAlignment.center,
-            children: [
-              if (icon != null) ...[
-                Icon(icon, size: 22, color: AppColors.textOnGradient),
-                const SizedBox(width: 8),
-              ],
-              Text(
-                text,
-                style: const TextStyle(
-                  fontSize: 17,
-                  fontWeight: FontWeight.w600,
-                  color: AppColors.textOnGradient,
-                ),
-              ),
-            ],
-          ),
-        ),
-      ),
-    );
-  }
-}
-
-/// 卡片内的小操作按钮
-class CardActionButton extends StatelessWidget {
-  final String label;
-  final IconData icon;
-  final VoidCallback? onTap;
-  final Color? iconColor;
-
-  const CardActionButton({
-    super.key,
-    required this.label,
-    required this.icon,
-    this.onTap,
-    this.iconColor,
-  });
-
-  @override
-  Widget build(BuildContext context) {
-    return InkWell(
-      onTap: onTap,
-      borderRadius: BorderRadius.circular(12),
-      child: Container(
-        padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 10),
-        decoration: BoxDecoration(
-          gradient: AppColors.surfaceGradient,
-          borderRadius: BorderRadius.circular(12),
-          border: Border.all(color: AppColors.borderLight),
-          boxShadow: AppColors.cardShadowLight,
-        ),
-        child: Row(
-          mainAxisSize: MainAxisSize.min,
-          children: [
-            Icon(icon, size: 18, color: iconColor ?? AppColors.primary),
-            const SizedBox(width: 6),
-            Text(
-              label,
-              style: TextStyle(
-                fontSize: 14,
-                fontWeight: FontWeight.w500,
-                color: AppColors.textPrimary,
-              ),
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-}
-
-/// 滑动删除组件：左滑露出红色删除背景，达30%阈值锁定，点击确认删除
-/// [margin] 控制卡片之间的间距，red背景与child完全对齐
 class SwipeDeleteTile extends StatefulWidget {
   final Widget child;
   final VoidCallback onDelete;
   final VoidCallback? onTap;
   final EdgeInsetsGeometry margin;
+
   const SwipeDeleteTile({
     super.key,
     required this.child,
@@ -119,6 +15,7 @@ class SwipeDeleteTile extends StatefulWidget {
     this.onTap,
     this.margin = const EdgeInsets.symmetric(horizontal: 16, vertical: 4),
   });
+
   @override
   State<SwipeDeleteTile> createState() => _SwipeDeleteTileState();
 }
@@ -127,18 +24,14 @@ class _SwipeDeleteTileState extends State<SwipeDeleteTile>
     with SingleTickerProviderStateMixin {
   double _dx = 0;
   static const _maxSlide = 80.0;
-  static const _threshold = 24.0; // 30% of 80
+  static const _threshold = 24.0;
 
   void _onDragUpdate(DragUpdateDetails d) {
     setState(() => _dx = (_dx + d.delta.dx).clamp(-_maxSlide, 0.0));
   }
 
   void _onDragEnd(DragEndDetails d) {
-    if (_dx < -_threshold) {
-      setState(() => _dx = -_maxSlide);
-    } else {
-      setState(() => _dx = 0);
-    }
+    setState(() => _dx = _dx < -_threshold ? -_maxSlide : 0);
   }
 
   @override
@@ -191,34 +84,3 @@ class _SwipeDeleteTileState extends State<SwipeDeleteTile>
     );
   }
 }
-
-/// 功能区小图标容器
-class IconBox extends StatelessWidget {
-  final IconData icon;
-  final double size;
-  final Color? backgroundColor;
-  final Color? iconColor;
-
-  const IconBox({
-    super.key,
-    required this.icon,
-    this.size = 44,
-    this.backgroundColor,
-    this.iconColor,
-  });
-
-  @override
-  Widget build(BuildContext context) {
-    return Container(
-      width: size,
-      height: size,
-      decoration: BoxDecoration(
-        gradient: backgroundColor == null ? AppColors.calmHealthGradient : null,
-        color: backgroundColor,
-        borderRadius: BorderRadius.circular(size / 3),
-        boxShadow: AppColors.cardShadowLight,
-      ),
-      child: Icon(icon, size: size * 0.55, color: iconColor ?? Colors.white),
-    );
-  }
-}