fix: 初始化时不显示日期范围变化提示

frontend/src/components/Dashboard.vue

@@ -113,6 +113,7 @@ const selectedKeywords = ref<string[]>([])
 const dateRange = ref<[string, string] | null>(null)
 const crawling = ref(false)
 const highPriorityCollapsed = ref(false)
+const isInitialized = ref(false)
 
 // 切换 High Priority Bids 的折叠状态
 const toggleHighPriority = () => {
@@ -145,6 +146,12 @@ watch(selectedKeywords, (newKeywords) => {
 
 // 监听日期范围变化并显示提示
 watch(dateRange, () => {
+  // 初始化时不显示提示
+  if (!isInitialized.value) {
+    isInitialized.value = true
+    return
+  }
+
   const totalBids = props.todayBids.length
   const filteredCount = filteredTodayBids.value.length