fix(ui): 调整返回顶部按钮的位置和偏移量

统一多个页面的返回顶部按钮样式，将底部位置调整为25vh，偏移量改为600，提升用户体验

@@ -154,7 +154,7 @@
 
     <van-dialog v-model:show="dialog_show" title="标题" show-cancel-button></van-dialog>
 
-    <van-back-top right="5vw" bottom="25vh" offset="400" />
+    <van-back-top right="5vw" bottom="25vh" offset="600" />
 
     <!-- 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" offset="400" />
+    <van-back-top right="5vw" bottom="25vh" offset="600" />
   </AppLayout>
 </template>
 

@@ -173,7 +173,7 @@
         <van-empty v-else description="暂无数据" />
       </div>
 
-      <van-back-top right="5vw" bottom="10vh" offset="400" />
+      <van-back-top right="5vw" bottom="25vh" offset="600" />
       <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: 2025-10-13 10:20:21
+ * @LastEditTime: 2025-10-13 10:28:29
  * @FilePath: /mlaj/src/views/teacher/studentPage.vue
  * @Description: 学生详情页面
 -->
@@ -272,7 +272,6 @@
         </div>
       </van-list>
       <van-empty v-show="activeTab === 'homework' && !checkinDataList.length" description="暂无数据" />
-      <van-back-top right="5vw" bottom="10vh" offset="400" />
       <div style="height: 5rem;"></div>
 
       <!-- 状态筛选弹窗 -->
@@ -369,6 +368,8 @@
           <p class="text-gray-700 text-center">确定要删除这条点评吗？</p>
         </div>
       </van-dialog>
+
+      <van-back-top right="5vw" bottom="25vh" offset="600" />
     </div>
   </van-config-provider>
 </template>