fix(ui): 统一调整返回顶部按钮的偏移量

为保持一致性，在所有页面中将返回顶部按钮的offset属性设置为400，并调整部分页面的bottom位置

 <!--
   * @Date: 2025-05-29 15:34:17
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-09-30 18:20:18
+ * @LastEditTime: 2025-10-13 10:19:55
  * @FilePath: /mlaj/src/views/checkin/IndexCheckInPage.vue
   * @Description: 文件描述
 -->
@@ -146,7 +146,6 @@
             </div>
           </van-list>
           <van-empty v-else description="暂无数据" />
-          <van-back-top right="5vw" bottom="10vh" />
         </div>
 
         <div style="height: 10rem;"></div>
@@ -155,7 +154,7 @@
 
     <van-dialog v-model:show="dialog_show" title="标题" show-cancel-button></van-dialog>
 
-    <van-back-top right="5vw" bottom="15vh" />
+    <van-back-top right="5vw" bottom="25vh" offset="400" />
 
     <!-- 底部悬浮打卡按钮 -->
     <div v-if="!taskDetail.is_finish" class="floating-checkin-button">

@@ -325,7 +325,7 @@
         </template>
       </div>
     </van-popup>
-    <van-back-top right="5vw" bottom="15vh" />
+    <van-back-top right="5vw" bottom="15vh" offset="400" />
   </AppLayout>
 </template>
 

@@ -173,7 +173,7 @@
         <van-empty v-else description="暂无数据" />
       </div>
 
-      <van-back-top right="5vw" bottom="10vh" />
+      <van-back-top right="5vw" bottom="10vh" offset="400" />
       <div style="height: 5rem;"></div>
     </van-config-provider>
 

@@ -2,7 +2,7 @@
  * @Author: hookehuyr hookehuyr@gmail.com
  * @Date: 2025-06-19 17:12:19
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-07-02 18:02:18
+ * @LastEditTime: 2025-10-13 10:20:21
  * @FilePath: /mlaj/src/views/teacher/studentPage.vue
  * @Description: 学生详情页面
 -->
@@ -272,7 +272,7 @@
         </div>
       </van-list>
       <van-empty v-show="activeTab === 'homework' && !checkinDataList.length" description="暂无数据" />
-      <van-back-top right="5vw" bottom="10vh" />
+      <van-back-top right="5vw" bottom="10vh" offset="400" />
       <div style="height: 5rem;"></div>
 
       <!-- 状态筛选弹窗 -->