fix: 欢迎卡片UI优化 + 蓝牙录入按钮 + 多处修复

- 欢迎卡片：去掉白框圆角错位、图片满宽、按钮去箭头改圆角居中
- 渐变actionOutlineGradient改紫蓝双色循环
- 新增健康Agent"蓝牙录入"按钮→蓝牙设备页
- "查看健康情况"改名"健康概览"
- 饮食编辑框删除bug修复(控制器缓存)
- 启动脚本加adb reverse自动转发
- 登录闪屏修复

health_app/lib/core/app_theme.dart

@@ -2,6 +2,23 @@ import 'package:flutter/material.dart';
 import 'package:shadcn_ui/shadcn_ui.dart';
 import 'app_colors.dart';
 
+class AppBackground extends StatelessWidget {
+  final Widget child;
+  final bool safeArea;
+
+  const AppBackground({super.key, required this.child, this.safeArea = false});
+
+  @override
+  Widget build(BuildContext context) {
+    final content = safeArea ? SafeArea(child: child) : child;
+
+    return DecoratedBox(
+      decoration: const BoxDecoration(gradient: AppColors.bgGradient),
+      child: content,
+    );
+  }
+}
+
 class GradientScaffold extends StatelessWidget {
   final PreferredSizeWidget? appBar;
   final Widget? body;
@@ -21,8 +38,7 @@ class GradientScaffold extends StatelessWidget {
   });
 
   @override
-  Widget build(BuildContext context) => Container(
-    decoration: const BoxDecoration(gradient: AppColors.bgGradient),
+  Widget build(BuildContext context) => AppBackground(
     child: Scaffold(
       backgroundColor: Colors.transparent,
       appBar: appBar,
@@ -123,34 +139,34 @@ class AppTheme {
       surface: surface,
       brightness: Brightness.light,
     ),
-    scaffoldBackgroundColor: bg,
+    scaffoldBackgroundColor: Colors.transparent,
     splashColor: primary.withValues(alpha: 0.06),
     highlightColor: Colors.transparent,
     hoverColor: primaryLight.withValues(alpha: 0.55),
     fontFamily: null,
 
-    appBarTheme: const AppBarTheme(
-      backgroundColor: surface,
+    appBarTheme: AppBarTheme(
+      backgroundColor: Colors.white.withValues(alpha: 0.9),
       foregroundColor: text,
       elevation: 0,
       centerTitle: true,
       scrolledUnderElevation: 0,
       surfaceTintColor: Colors.transparent,
-      titleTextStyle: TextStyle(
+      titleTextStyle: const TextStyle(
         fontSize: 17,
         fontWeight: FontWeight.w700,
         color: text,
       ),
-      toolbarHeight: 48,
+      toolbarHeight: 52,
     ),
 
     cardTheme: CardThemeData(
-      color: surface,
+      color: Colors.white,
       elevation: 0,
       surfaceTintColor: Colors.transparent,
       shape: RoundedRectangleBorder(
         borderRadius: BorderRadius.circular(rLg),
-        side: const BorderSide(color: border),
+        side: const BorderSide(color: AppColors.borderLight),
       ),
       margin: EdgeInsets.zero,
     ),
@@ -161,15 +177,15 @@ class AppTheme {
       contentPadding: const EdgeInsets.symmetric(horizontal: sLg, vertical: 13),
       border: OutlineInputBorder(
         borderRadius: BorderRadius.circular(rMd),
-        borderSide: const BorderSide(color: border),
+        borderSide: const BorderSide(color: AppColors.borderLight),
       ),
       enabledBorder: OutlineInputBorder(
         borderRadius: BorderRadius.circular(rMd),
-        borderSide: const BorderSide(color: border),
+        borderSide: const BorderSide(color: AppColors.borderLight),
       ),
       focusedBorder: OutlineInputBorder(
         borderRadius: BorderRadius.circular(rMd),
-        borderSide: const BorderSide(color: primary, width: 1.2),
+        borderSide: const BorderSide(color: AppColors.auraIndigo, width: 1.3),
       ),
       errorBorder: OutlineInputBorder(
         borderRadius: BorderRadius.circular(rMd),
@@ -183,7 +199,7 @@ class AppTheme {
         backgroundColor: primary,
         foregroundColor: Colors.white,
         minimumSize: const Size(double.infinity, 50),
-        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(rMd)),
+        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(rLg)),
         textStyle: const TextStyle(fontSize: 16, fontWeight: FontWeight.w700),
         elevation: 0,
       ),