style(teacher/checkinPage): 修改日期选择器图标和文字颜色为绿色

 <!--
   * @Date: 2025-05-29 15:34:17
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-12-14 01:28:56
+ * @LastEditTime: 2025-12-14 01:33:55
  * @FilePath: /mlaj/src/views/teacher/checkinPage.vue
   * @Description: 文件描述
 -->
@@ -20,8 +20,8 @@
         <!-- 日期选择触发区域 -->
         <div class="bg-white px-4 py-3 flex items-center justify-between border-b border-gray-100 cursor-pointer" @click="showCalendar = true">
           <div class="flex items-center gap-2">
-            <van-icon name="calendar-o" class="text-primary text-xl" />
-            <span class="text-base font-bold text-gray-800">{{ formattedSelectedDate }}</span>
+            <van-icon name="calendar-o" class="text-xl" color="#4caf50" />
+            <span style="color: #4caf50;" class="text-base font-bold">{{ formattedSelectedDate }}</span>
           </div>
           <div class="flex items-center text-gray-400 text-sm">
             <span>切换日期</span>