fix(MyFavoritesPage): 替换跳转链接为暂无数据提示

使用 vant 的 showToast 替代直接跳转百度，提升用户体验

@@ -57,6 +57,7 @@ import ActivityCard from '@/components/ui/ActivityCard.vue';
 import { courses as mockCourses, activities as mockActivities } from '@/utils/mockData';
 import { useTitle } from '@vueuse/core';
 import AppLayout from "@/components/layout/AppLayout.vue";
+import { showToast } from 'vant';
 
 // 导入接口
 import { getGroupFavoriteListAPI } from '@/api/favorite';
@@ -117,7 +118,9 @@ const onCoursesLoad = async () => {
 // 切换标签页
 const onClickTab = ({ name, title }) => {
   if (name === 'activities') {
-    location.href = 'http://www.baidu.com'
+    // location.href = 'http://www.baidu.com'
+    // 提示暂无数据
+    showToast('暂无收藏活动')
   }
 };
 </script>