fix: use reactive array instead of Set for newRecordIds

frontend/pages/support-activity/components/ContributionList.vue

@@ -34,7 +34,7 @@ const props = defineProps({
 
 const visible = ref(true)
 const isPageActive = ref(true)
-const newRecordIds = ref(new Set())
+const newRecordIds = ref([])
 
 // 使用轮询 composable
 const { records, loading, error, start, stop, refresh } = useContributionPolling(
@@ -44,7 +44,7 @@ const { records, loading, error, start, stop, refresh } = useContributionPolling
 
 // 判断记录是否为新记录（刚加入的）
 function isNewRecord(id) {
-  return newRecordIds.value.has(id)
+  return newRecordIds.value.includes(id)
 }
 
 // 监听 records 变化，标记新记录
@@ -56,10 +56,10 @@ watch(records, (newRecords, oldRecords) => {
     // 找出新增的记录ID
     for (const id of newIds) {
       if (!oldIds.includes(id)) {
-        newRecordIds.value.add(id)
+        newRecordIds.value.push(id)
         // 2秒后移除新记录标记
         setTimeout(() => {
-          newRecordIds.value.delete(id)
+          newRecordIds.value = newRecordIds.value.filter(i => i !== id)
         }, 2000)
       }
     }