feat(任务筛选): 添加弹窗显示状态监听并控制返回顶部按钮

添加对任务筛选组件弹窗显示状态的监听，当弹窗显示时隐藏返回顶部按钮，提升用户体验

@@ -55,11 +55,16 @@ const props = defineProps({
   }
 })
 
-const emit = defineEmits(['change'])
+const emit = defineEmits(['change', 'popup-visible-change'])
 
 // 状态
 const showTaskPicker = ref(false)
 const showSubtaskPicker = ref(false)
+
+// 监听弹窗显示状态
+watch([showTaskPicker, showSubtaskPicker], ([showTask, showSubtask]) => {
+  emit('popup-visible-change', showTask || showSubtask)
+})
 const taskList = ref([])
 const subtaskList = ref([])
 const selectedTaskId = ref('')

@@ -2,7 +2,7 @@
  * @Author: hookehuyr hookehuyr@gmail.com
  * @Date: 2025-06-19 17:12:19
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-12-15 13:08:35
+ * @LastEditTime: 2025-12-15 13:45:56
  * @FilePath: /mlaj/src/views/teacher/studentPage.vue
  * @Description: 学生详情页面
 -->
@@ -100,6 +100,7 @@
               :key="currentGroupId"
               :group-id="currentGroupId"
               @change="handleTaskFilterChange"
+              @popup-visible-change="handlePopupVisibleChange"
             />
           </div>
           <van-tabs v-model:active="activeTab" color="#4caf50" animated swipeable @change="handleTabChange">
@@ -321,7 +322,7 @@
         </div>
       </van-dialog>
 
-      <van-back-top right="5vw" bottom="25vh" offset="600" />
+      <van-back-top v-if="showBackTop" right="5vw" bottom="25vh" offset="600" />
     </div>
   </van-config-provider>
 </template>
@@ -392,6 +393,12 @@ const handleTaskFilterChange = ({ task_id, subtask_id }) => {
   getStatList()
 }
 
+// 返回顶部按钮显示控制
+const showBackTop = ref(true)
+const handlePopupVisibleChange = (isVisible) => {
+  showBackTop.value = !isVisible
+}
+
 // 当前选中的标签页
 const activeTab = ref('homework')