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/pages/device/device_scan_page.dart

@@ -5,6 +5,7 @@ import 'package:flutter_blue_plus/flutter_blue_plus.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:permission_handler/permission_handler.dart';
 import '../../core/app_colors.dart';
+import '../../core/app_theme.dart';
 import '../../core/navigation_provider.dart';
 import '../../providers/auth_provider.dart';
 import '../../providers/omron_device_provider.dart';
@@ -183,10 +184,9 @@ class _DeviceScanPageState extends ConsumerState<DeviceScanPage>
 
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
-      backgroundColor: Colors.white,
+    return GradientScaffold(
       appBar: AppBar(
-        backgroundColor: Colors.white,
+        backgroundColor: Colors.white.withValues(alpha: 0.9),
         elevation: 0,
         title: Text(
           _connected ? _deviceName : '添加设备',
@@ -256,7 +256,7 @@ class _DeviceScanPageState extends ConsumerState<DeviceScanPage>
                 height: 80 * _pulseAnim.value,
                 decoration: BoxDecoration(
                   shape: BoxShape.circle,
-                  color: AppColors.primary.withValues(alpha: 0.08),
+                  color: AppColors.auraIndigo.withValues(alpha: 0.10),
                 ),
               ),
             ),
@@ -264,13 +264,14 @@ class _DeviceScanPageState extends ConsumerState<DeviceScanPage>
               width: 64,
               height: 64,
               decoration: BoxDecoration(
-                color: AppColors.avatarBg,
+                gradient: AppColors.calmHealthGradient,
                 borderRadius: BorderRadius.circular(20),
+                boxShadow: AppColors.buttonShadow,
               ),
               child: const Icon(
                 Icons.bluetooth_searching,
                 size: 32,
-                color: AppColors.primary,
+                color: Colors.white,
               ),
             ),
           ],
@@ -301,19 +302,18 @@ class _DeviceScanPageState extends ConsumerState<DeviceScanPage>
             width: 100,
             height: 100,
             decoration: BoxDecoration(
-              color: _readingReceived
-                  ? AppColors.successLight
-                  : AppColors.avatarBg,
+              gradient: _readingReceived
+                  ? AppColors.calmHealthGradient
+                  : AppColors.primaryGradient,
               borderRadius: BorderRadius.circular(32),
+              boxShadow: AppColors.buttonShadow,
             ),
             child: Icon(
               _readingReceived
                   ? Icons.check_rounded
                   : Icons.bluetooth_connected,
               size: 48,
-              color: _readingReceived
-                  ? const Color(0xFF10B981)
-                  : AppColors.primary,
+              color: _readingReceived ? Colors.white : Colors.white,
             ),
           ),
           const SizedBox(height: 24),
@@ -456,9 +456,9 @@ class _DeviceScanPageState extends ConsumerState<DeviceScanPage>
       margin: const EdgeInsets.only(bottom: 8),
       padding: const EdgeInsets.all(14),
       decoration: BoxDecoration(
-        color: Colors.white,
+        gradient: AppColors.surfaceGradient,
         borderRadius: BorderRadius.circular(16),
-        border: Border.all(color: AppColors.border),
+        border: Border.all(color: AppColors.borderLight),
         boxShadow: AppColors.cardShadowLight,
       ),
       child: Row(
@@ -467,14 +467,10 @@ class _DeviceScanPageState extends ConsumerState<DeviceScanPage>
             width: 44,
             height: 44,
             decoration: BoxDecoration(
-              color: AppColors.avatarBg,
+              gradient: AppColors.calmHealthGradient,
               borderRadius: BorderRadius.circular(12),
             ),
-            child: const Icon(
-              Icons.bluetooth,
-              size: 22,
-              color: AppColors.primary,
-            ),
+            child: const Icon(Icons.bluetooth, size: 22, color: Colors.white),
           ),
           const SizedBox(width: 12),
           Expanded(
@@ -515,8 +511,9 @@ class _DeviceScanPageState extends ConsumerState<DeviceScanPage>
                   vertical: 10,
                 ),
                 decoration: BoxDecoration(
-                  color: AppColors.primary,
+                  gradient: AppColors.primaryGradient,
                   borderRadius: BorderRadius.circular(12),
+                  boxShadow: AppColors.buttonShadow,
                 ),
                 child: const Text(
                   '连接',