fix(monitor): clean up unused updatedAt/updatedLabel after label removal

frontend/src/components/user/monitor/MonitorHero.vue

@@ -60,14 +60,11 @@ import { computed } from 'vue'
 import { useI18n } from 'vue-i18n'
 import Icon from '@/components/icons/Icon.vue'
 import AutoRefreshButton from '@/components/common/AutoRefreshButton.vue'
-import { useChannelMonitorFormat } from '@/composables/useChannelMonitorFormat'
-
 export type MonitorWindow = '7d' | '15d' | '30d'
 export type OverallStatus = 'operational' | 'degraded'
 
 const props = defineProps<{
   overallStatus: OverallStatus
-  updatedAt: string | null
   intervalSeconds: number
   window: MonitorWindow
   loading: boolean
@@ -87,7 +84,6 @@ const emit = defineEmits<{
 }>()
 
 const { t } = useI18n()
-const { formatRelativeTime } = useChannelMonitorFormat()
 
 const windowOptions = computed<{ value: MonitorWindow; label: string }[]>(() => [
   { value: '7d', label: t('channelStatus.windowTab.7d') },
@@ -117,8 +113,4 @@ const overallDotClass = computed(() => {
   }
 })
 
-const updatedLabel = computed(() => {
-  if (!props.updatedAt) return t('monitorCommon.updatedAt', { time: '--' })
-  return t('monitorCommon.updatedAt', { time: formatRelativeTime(props.updatedAt) })
-})
 </script>

frontend/src/views/user/ChannelStatusView.vue

@@ -2,7 +2,6 @@
   <AppLayout>
     <MonitorHero
       :overall-status="overallStatus"
-      :updated-at="updatedAt"
       :interval-seconds="DEFAULT_INTERVAL_SECONDS"
       :window="currentWindow"
       :loading="loading"
@@ -56,7 +55,6 @@ const appStore = useAppStore()
 // ── State ──
 const items = ref<UserMonitorView[]>([])
 const loading = ref(false)
-const updatedAt = ref<string | null>(null)
 const currentWindow = ref<MonitorWindow>('7d')
 const detailCache = reactive<Record<number, UserMonitorDetail>>({})
 const showDetail = ref(false)
@@ -97,7 +95,6 @@ async function reload(silent = false) {
     const res = await listChannelMonitorViews({ signal: ctrl.signal })
     if (ctrl.signal.aborted || abortController !== ctrl) return
     items.value = res.items || []
-    updatedAt.value = new Date().toISOString()
   } catch (err: unknown) {
     const e = err as { name?: string; code?: string }
     if (e?.name === 'AbortError' || e?.code === 'ERR_CANCELED') return