refactor(checkinPage): 移除日历组件的固定高度样式

 <!--
   * @Date: 2025-05-29 15:34:17
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-10-27 16:21:16
+ * @LastEditTime: 2025-10-27 16:34:26
  * @FilePath: /mlaj/src/views/teacher/checkinPage.vue
   * @Description: 文件描述
 -->
@@ -16,7 +16,7 @@
         </van-dropdown-menu>
       </van-sticky>
 
-      <van-calendar ref="myRefCalendar" :show-title="false" :poppable="false" :show-confirm="false" :style="{ height: calendarHeight }"
+      <van-calendar ref="myRefCalendar" :show-title="false" :poppable="false" :show-confirm="false"
         switch-mode="year-month" color="#4caf50" :formatter="formatter" row-height="50" :show-mark="false"
         @select="onSelectDay"
         @panel-change="onPanelChange"