style: 今日健康卡片顶部标题改用健康档案的紫蓝左右渐变

health_app/lib/pages/home/widgets/chat_messages_view.dart

@@ -1703,7 +1703,11 @@ class ChatMessagesView extends ConsumerWidget {
             width: double.infinity,
             padding: const EdgeInsets.fromLTRB(16, 12, 16, 10),
             decoration: const BoxDecoration(
-              gradient: AppColors.drawerGradient,
+              gradient: LinearGradient(
+                begin: Alignment.centerLeft,
+                end: Alignment.centerRight,
+                colors: [Color(0xFFE0C3FC), Color(0xFF8EC5FC)],
+              ),
               borderRadius: BorderRadius.vertical(top: Radius.circular(28)),
             ),
             child: Row(