feat(UI): 添加返回顶部按钮并调整评论图标样式

在IndexCheckInPage页面添加返回顶部按钮并设置样式
在studentPage页面调整评论图标大小和边距

 <!--
   * @Date: 2025-05-29 15:34:17
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-06-24 17:13:18
+ * @LastEditTime: 2025-06-24 17:25:52
  * @FilePath: /mlaj/src/views/checkin/IndexCheckInPage.vue
   * @Description: 文件描述
 -->
@@ -155,6 +155,7 @@
           </div>
         </van-list>
         <van-empty v-else description="暂无数据" />
+        <van-back-top right="5vw" bottom="10vh" />
       </div>
 
       <div style="height: 5rem;"></div>
@@ -707,6 +708,10 @@ const formatData = (data) => {
 </script>
 
 <style lang="less">
+.van-back-top {
+  background-color: #4caf50;
+}
+
 .calendar-selected {
   .van-calendar__selected-day {
     background: #4caf50 !important;

@@ -2,7 +2,7 @@
  * @Author: hookehuyr hookehuyr@gmail.com
  * @Date: 2025-06-19 17:12:19
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-06-23 14:08:43
+ * @LastEditTime: 2025-06-24 17:23:46
  * @FilePath: /mlaj/src/views/teacher/studentPage.vue
  * @Description: 学生详情页面
 -->
@@ -249,8 +249,9 @@
               <van-icon
                 name="comment-o"
                 :color="post.is_commented ? '#10b981' : '#999'"
-                size="18"
+                size="19"
                 class="mr-1"
+                style="margin-top: 0.2rem;"
               />
               <span class="text-sm" :class="post.is_commented ? 'text-green-600' : 'text-gray-500'">
                 {{ post.is_commented ? '已点评' : '点评' }}