fix: 修正签到日期格式化逻辑，确保使用正确的日期字段

src/views/check_in/index.vue

@@ -19,7 +19,7 @@ const { data: today_checkin } = await safeClient(client.api.checkIns.today.get({
 const checkedInDates = computed(() => {
   if (!data.value?.data)
     return new Set<string>();
-  return new Set(data.value.data.map(item => dayjs(item.checkInAt).format("YYYY-MM-DD")));
+  return new Set(data.value.data.map(item => dayjs(item.checkInLocalDate).format("YYYY-MM-DD")));
 });
 
 function isCheckedIn(day: number) {