feat(签到): 更新签到日期并添加今日选中样式

- 将签到日期从[1,3,5,7]改为[1,2]
- 为当前日期添加'calendar-today'样式并自动选中
- 在课程页面添加签到入口点击事件
```

这个提交消息：
1. 使用feat类型表示新增功能
2. 添加了(签到)范围明确修改领域
3. 简洁描述了三个主要变更点
4. 使用中文符合要求
5. 每个变更点用短横线列出，保持简洁清晰
6. 避免了重复信息
7. 使用祈使语气("更新"、"添加")

 <!--
  * @Date: 2025-05-29 15:34:17
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-06-03 15:43:39
+ * @LastEditTime: 2025-06-03 16:07:54
  * @FilePath: /mlaj/src/views/checkin/IndexCheckInPage.vue
  * @Description: 文件描述
 -->
@@ -475,7 +475,7 @@ const formatter = (day) => {
   const month = day.date.getMonth() + 1;
   const date = day.date.getDate();
 
-  let checkin_days = [1, 3, 5, 7];
+  let checkin_days = [1, 2];
 
   if (month === 6) {
     if (checkin_days.includes(date)) {
@@ -483,6 +483,11 @@ const formatter = (day) => {
       day.type = 'selected';
     }
   }
+  // 选中今天的日期
+  if (dayjs(day.date).isSame(new Date(), 'day')) {
+    day.className = 'calendar-today';
+    day.type ='selected';
+  }
 
   return day;
 }

@@ -98,7 +98,7 @@
                 <!-- 互动区域 -->
                 <div id="interaction" class="py-4 px-4">
                     <div class="bg-white rounded-lg p-4 mb-4 cursor-pointer">
-                        <div class="flex items-center justify-between">
+                        <div class="flex items-center justify-between" @click="goToCheckin()">
                             <div class="flex items-center gap-3">
                                 <van-icon size="3rem" name="calendar-o" class="text-xl text-gray-600" />
                                 <div>
@@ -321,6 +321,10 @@ const handleTabChange = (name) => {
 const goToStudyDetail = (lessonId) => {
     router.push(`/studyDetail/${lessonId}`);
 };
+
+const goToCheckin = () => {
+    router.push(`/checkin/index?course_id=${course.value.id}`);
+};
 </script>
 
 <style scoped>