## 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)
