feat: periodically re-poll queue progress state (#9136)

## Summary
- Add `useQueuePolling` composable that polls `queueStore.update()`
every 5s while jobs are active
- Calls `update()` immediately on creation so the UI is current after
page reload
- Uses `useIntervalFn` + `watch` pattern (same as `assetDownloadStore`)
to pause/resume based on `activeJobsCount`

## Related Issue
- Related to #8136

## QA
- Queue a prompt, reload page mid-execution, verify queue UI updates
every ~5s
- Verify polling stops when queue empties
- Verify polling resumes when new jobs are queued

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9136-feat-periodically-re-poll-queue-progress-state-3106d73d36508119a32fc5b9c8eda21c)
by [Unito](https://www.unito.io)

src/views/GraphView.vue

@@ -51,6 +51,7 @@ import InviteAcceptedToast from '@/platform/workspace/components/toasts/InviteAc
 import RerouteMigrationToast from '@/components/toast/RerouteMigrationToast.vue'
 import { useBrowserTabTitle } from '@/composables/useBrowserTabTitle'
 import { useCoreCommands } from '@/composables/useCoreCommands'
+import { useQueuePolling } from '@/platform/remote/comfyui/useQueuePolling'
 import { useErrorHandling } from '@/composables/useErrorHandling'
 import { useProgressFavicon } from '@/composables/useProgressFavicon'
 import { SERVER_CONFIG_ITEMS } from '@/constants/serverConfig'
@@ -209,6 +210,7 @@ useKeybindingService().registerCoreKeybindings()
 useSidebarTabStore().registerCoreSidebarTabs()
 void useBottomPanelStore().registerCoreBottomPanelTabs()
 
+useQueuePolling()
 const queuePendingTaskCountStore = useQueuePendingTaskCountStore()
 const sidebarTabStore = useSidebarTabStore()