style(views/checkin): 更新日历选中日期的样式

将日历选中日期的背景色改为白色，添加金色边框和文字颜色以提升视觉效果

 <!--
   * @Date: 2025-05-29 15:34:17
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-11-13 18:32:20
+ * @LastEditTime: 2025-11-14 11:11:16
  * @FilePath: /mlaj/src/views/checkin/IndexCheckInPage.vue
   * @Description: 文件描述
 -->
@@ -856,7 +856,9 @@ const formatData = (data) => {
 
 .calendar-fill-checkin {
   .van-calendar__selected-day {
-    background: #a2d8a3 !important;
+    background: #FFF !important;
+    border: 1px solid darkgoldenrod !important;
+    color: darkgoldenrod !important;
   }
 }