refactor: 移除冗余的vant toast样式导入并更新按钮文案

移除多个组件中重复导入的vant toast样式，统一在App.vue中导入，提高代码整洁度。同时更新UploadVideoPopup.vue中的按钮文案，使其更符合用户操作习惯。

 <!--
  * @Date: 2025-03-20 19:53:12
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-03-24 09:55:15
+ * @LastEditTime: 2025-03-25 10:56:11
  * @FilePath: /mlaj/src/App.vue
  * @Description: 入口文件
 -->
@@ -20,6 +20,7 @@ import { wxJsAPI } from "@/api/wx/config";
 import { apiList } from "@/api/wx/jsApiList.js";
 import { wxInfo, getUrlParams, stringifyQuery } from "@/utils/tools";
 
+import 'vant/es/toast/style'
 
 provideAuth(); // 提供全局认证状态
 provideCart('single'); // 提供全局购物车状态，单一商品模式

@@ -83,7 +83,6 @@
 <script setup>
 import { ref } from 'vue'
 import { showToast } from 'vant'
-import 'vant/lib/toast/style'
 import { checkInTypes } from '@/utils/mockData'
 
 const props = defineProps({

@@ -22,7 +22,7 @@
           accept="video/*"
           @oversize="onOversize"
         >
-          <van-button icon="plus" type="primary">上传视频</van-button>
+          <van-button type="default">请选择视频</van-button>
         </van-uploader>
 
         <div v-if="uploadProgress > 0 && uploadProgress < 100" class="progress">

@@ -528,7 +528,6 @@ import { courses, liveStreams, activities, checkInTypes, userRecommendations } f
 import { useTitle } from '@vueuse/core'
 import { useAuth } from '@/contexts/auth'
 import { showToast } from 'vant'
-import 'vant/lib/toast/style'
 
 // 视频播放状态管理
 const activeVideoIndex = ref(null); // 当前播放的视频索引