## Summary
Replace the old completion-summary overlay path with queue notification
banners for queueing/completed/failed lifecycle feedback.
## Key changes
- Added `QueueNotificationBanner`, `QueueNotificationBannerHost`,
stories, and tests.
- Added `useQueueNotificationBanners` to handle:
- immediate `queuedPending` on `promptQueueing`
- transition to `queued` on `promptQueued` (request-id aware)
- completed/failed notification sequencing from finished batch history
- timed notification queueing/dismissal
- Removed completion-summary implementation:
- `useCompletionSummary`
- `CompletionSummaryBanner`
- `QueueOverlayEmpty`
- Simplified `QueueProgressOverlay` to `hidden | active | expanded`
states.
- Top menu behavior:
- restored `QueueInlineProgressSummary` as separate UI
- ordering is inline summary first, notification banner below
- notification banner remains under the top menu section (not teleported
to floating actionbar target)
- Kept established API-event signaling pattern
(`promptQueueing`/`promptQueued`) instead of introducing a separate bus.
- Updated tests for top-menu visibility/ordering and notification
behavior across QPOV2 enabled/disabled.
## Notes
- Completion notifications now support stacked thumbnails (cap: 3).
-
https://www.figma.com/design/LVilZgHGk5RwWOkVN6yCEK/Queue-Progress-Modal?node-id=3843-20314&m=dev
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8740-feat-Queue-Notification-Toasts-3016d73d3650814c8a50d9567a40f44d)
by [Unito](https://www.unito.io)
