fix(打卡页面): 修复打卡按钮显示条件逻辑

添加任务详情准备状态检查，优化完成状态判断逻辑

 <!--
   * @Date: 2025-05-29 15:34:17
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2026-01-21 15:30:00
+ * @LastEditTime: 2026-01-22 21:30:20
  * @FilePath: /mlaj/src/views/checkin/IndexCheckInPage.vue
   * @Description: 文件描述
 -->
@@ -134,7 +134,7 @@
     <van-back-top right="5vw" bottom="25vh" offset="600" />
 
     <!-- 底部悬浮打卡按钮 -->
-    <div v-if="!taskDetail.is_finish" class="floating-checkin-button" :class="{ 'is-compact': isCompactButton }">
+    <div v-if="is_task_detail_ready && !is_task_finished" class="floating-checkin-button" :class="{ 'is-compact': isCompactButton }">
       <van-button
         type="primary"
         round
@@ -177,6 +177,12 @@ useTitle(route.meta.title);
 const { y } = useScroll(window)
 const isCompactButton = computed(() => y.value > 200)
 
+const is_task_detail_ready = ref(false)
+const is_task_finished = computed(() => {
+  const val = taskDetail.value ? taskDetail.value.is_finish : undefined
+  return val === 1 || val === '1' || val === true
+})
+
 // 动态字段文字
 const dynamicFieldText = ref('感恩')
 
@@ -606,6 +612,7 @@ const getTaskDetail = async (month) => {
   const { code, data } = await getTaskDetailAPI({ i: route.query.id, month, subtask_id: selectedSubtaskId.value });
   if (code === 1) {
     taskDetail.value = data;
+    is_task_detail_ready.value = true
     progress1.value = ((data.checkin_number/data.target_number)*100).toFixed(1); // 计算进度条百分比
     showProgress.value = !isNaN(progress1.value); // 如果是NaN，就不显示进度条
     teamAvatars.value = taskDetail.value.checkin_avatars?.length > 8 ? taskDetail.value.checkin_avatars.splice(0, 8) : taskDetail.value.checkin_avatars;
@@ -666,6 +673,7 @@ const initPage = async (date) => {
     finished.value = false;
     loading.value = false;
     taskDetail.value = {};
+    is_task_detail_ready.value = false
     selectedSubtaskId.value = '';
 
     const current_date = date || route.query.date;