style(MyFavoritesPage): 移除多余的py-3类名

@@ -2,7 +2,7 @@
   <AppLayout>
     <div class="bg-gradient-to-b from-green-50/70 to-white/90 min-h-screen pb-20">
       <!-- 分类切换 -->
-      <div class="px-4 py-3">
+      <div class="px-4">
         <!-- <van-tabs v-model:active="activeTab" @click-tab="onClickTab" sticky swipeable title-active-color="#4caf50" color="#4caf50"> -->
           <!-- <van-tab title="课程" name="courses"> -->
             <van-list