feat(teacher/taskHomePage): 改进日历组件功能并优化样式

- 添加月份切换时获取打卡日期的功能
- 优化日历日期格式化逻辑，支持显示已打卡状态
- 调整日历弹窗高度和确认按钮显示
- 新增日历选中日期样式和今日标记
- 修复附件类型显示换行问题

 <!--
  * @Date: 2025-11-19 21:00:00
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-12-12 18:11:45
+ * @LastEditTime: 2025-12-13 21:24:23
  * @FilePath: /mlaj/src/views/teacher/taskHomePage.vue
  * @Description: 教师端作业主页（头部介绍、统计、日历与学生完成情况；数据Mock）
 -->
@@ -29,7 +29,8 @@
                 <div class="detailItem">频次：{{ task_details.frequency }}</div>
                 <div v-if="task_details.begin_date" class="detailItem">开始时间：{{ task_details.begin_date }}</div>
                 <div v-if="task_details.end_date" class="detailItem">截止时间：{{ task_details.end_date }}</div>
-                <div v-if="task_details.attachment_type.length" class="detailItem">附件类型：{{ task_details.attachment_type }}</div>
+                <div v-if="task_details.attachment_type.length" class="detailItem">附件类型：{{ task_details.attachment_type
+                    }}</div>
                 <div v-if="task_type === 'checkin'" class="detailItem">类型：打卡签到</div>
             </div>
         </div>
@@ -88,20 +89,15 @@
             <!-- <div class="mt-3 text-sm text-gray-600">当前选择：{{ current_date_text }}</div> -->
             <!-- 日历弹窗：点击“某个日期”弹出 -->
             <van-config-provider :theme-vars="themeVars">
-                <van-calendar v-model:show="show_calendar_popup" :default-date="calendar_default_date" color="#10b981"
-                :show-confirm="true" switch-mode="month" :formatter="formatter" @confirm="on_date_select" />
+                <van-calendar v-model:show="show_calendar_popup" :default-date="calendar_default_date" color="#4caf50"
+                    :show-confirm="false" switch-mode="month" :formatter="formatter" @select="on_date_select" @panel-change="onPanelChange" />
             </van-config-provider>
         </div>
 
         <!-- 小作业选择弹窗 -->
         <van-popup v-model:show="show_subtask_picker" position="bottom" round>
-            <van-picker
-                :columns="subtask_columns"
-                @confirm="on_confirm_subtask"
-                @cancel="show_subtask_picker = false"
-                show-toolbar
-                title="选择作业"
-            />
+            <van-picker :columns="subtask_columns" @confirm="on_confirm_subtask" @cancel="show_subtask_picker = false"
+                show-toolbar title="选择作业" />
         </van-popup>
 
         <!-- 学生完成情况（参考图片2样式） -->
@@ -132,6 +128,7 @@ import { useRoute, useRouter } from 'vue-router'
 import { useTitle } from '@vueuse/core'
 import checkCorner from '@/assets/images/dui.png'
 import { getTeacherTaskDetailAPI } from '@/api/teacher'
+import { getCheckinTeacherCheckedDatesAPI } from '@/api/checkin'
 import dayjs from 'dayjs'
 
 const $route = useRoute()
@@ -139,7 +136,7 @@ const $router = useRouter()
 useTitle('作业主页')
 
 const themeVars = {
-    calendarPopupHeight: '60%',
+    calendarPopupHeight: '55%',
 }
 
 // 弹窗显示状态：是否展示“某个日期”选择日历
@@ -178,29 +175,49 @@ function select_yesterday() {
     calendar_default_date.value = null
 }
 
+const currentMonth = ref(dayjs().format('YYYY-MM'));
+const selectedDate = ref(dayjs().format('YYYY-MM-DD'));
+
 /**
  * 日历日期格式化函数
  * @param {Object} day - 日历天对象
  * @returns {Object} 处理后的日历天对象
  */
 const formatter = (day) => {
-    const dateStr = format_date(day.date)
-    const today = new Date()
-    const todayStr = format_date(today)
-
-    const yesterday = new Date(today)
-    yesterday.setDate(today.getDate() - 1)
-    const yesterdayStr = format_date(yesterday)
+    const year = day.date.getFullYear();
+    const month = day.date.getMonth() + 1;
+    const date = day.date.getDate();
+
+    let checkin_days = myCheckinDates.value;
+
+    // 检查当前日期是否在签到日期列表中
+    if (checkin_days && checkin_days.length > 0) {
+        // 格式化当前日期为YYYY-MM-DD格式，与checkin_days中的格式匹配
+        const formattedDate = `${year}-${month.toString().padStart(2, '0')}-${date.toString().padStart(2, '0')}`;
+
+        // 检查是否已打卡
+        if (checkin_days.includes(formattedDate)) {
+            // 如果是当前选中的已打卡日期，使用特殊样式
+            if (selectedDate.value === formattedDate) {
+                day.className = 'calendar-selected';
+                day.type = 'selected';
+                day.bottomInfo = '已打卡';
+            } else {
+                day.className = 'calendar-checkin';
+                day.type = 'selected';
+                day.bottomInfo = '已打卡';
+            }
+        }
+    }
 
-    if (dateStr === todayStr) {
+    // 选中今天的日期
+    if (dayjs(day.date).isSame(new Date(), 'day')) {
         day.className = 'calendar-today';
-        day.bottomInfo = '今日'
-    } else if (dateStr === yesterdayStr) {
-        day.className = 'calendar-yesterday';
-        day.bottomInfo = '昨日'
+        day.type = 'selected';
+        day.bottomInfo = '今日';
     }
 
-    return day
+    return day;
 }
 
 /**
@@ -263,6 +280,7 @@ const on_confirm_subtask = ({ selectedOptions }) => {
     if (selectedOptions && selectedOptions[0]) {
         selectedSubtaskId.value = selectedOptions[0].value
         fetchData()
+        getCheckedDates(dayjs().format('YYYY-MM'));
     }
     show_subtask_picker.value = false
 }
@@ -339,8 +357,23 @@ watch(selected_date, () => {
     fetchData()
 })
 
+const myCheckinDates = ref([]);
+
+// 获取用户打卡日期的函数
+const getCheckedDates = async (month) => {
+    const checkedDatesResult = await getCheckinTeacherCheckedDatesAPI({
+        id: task_id,
+        subtask_id: selectedSubtaskId.value,
+        month
+    });
+    if (checkedDatesResult.code) {
+        myCheckinDates.value = checkedDatesResult.data.my_checkin_dates;
+    }
+}
+
 onMounted(() => {
     fetchData()
+    getCheckedDates(dayjs().format('YYYY-MM'));
 })
 
 /**
@@ -391,6 +424,12 @@ function on_date_select(val) {
     calendar_default_date.value = is_date_obj ? val : parse_date_text(text)
 }
 
+// 切换月份时触发
+const onPanelChange = ({ date }) => {
+    currentMonth.value = dayjs(date).format('YYYY-MM');
+    getCheckedDates(currentMonth.value);
+}
+
 /**
  * 计算某日期下学生完成情况列表
  * @returns {{id:string,name:string,completed:boolean}[]} 学生状态列表
@@ -438,7 +477,7 @@ function go_student_record(stu) {
 }
 </script>
 
-<style lang="less" scoped>
+<style lang="less">
 .TaskHomePage {
     min-height: 100vh;
     background: linear-gradient(to bottom right, #f0fdf4, #f0fdfa, #eff6ff);
@@ -507,4 +546,16 @@ function go_student_record(stu) {
         }
     }
 }
+
+.calendar-checkin {
+    .van-calendar__selected-day {
+        background: #a2d8a3 !important;
+    }
+}
+
+.calendar-today {
+    .van-calendar__selected-day {
+        background: #FAAB0C !important;
+    }
+}
 </style>