<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Allow users to queue multiple messages while a response is streaming.
Queued items are visible, editable, reorderable, and auto-send
one-by-one only after the current stream ends successfully.

- **New Features**
- Per-chat queue state via queuedMessagesByIdAtom and
streamCompletedSuccessfullyByIdAtom.
- QueuedMessagesList to view, edit, reorder, and delete items; shows
status and attachment indicator.
- ChatInput queues while streaming, supports editing queued items,
clears input/attachments only on successful queue/send, and clears all
queued on cancel.
- useStreamChat exposes queuedMessages and
queue/update/remove/reorder/clear APIs; processes the next item only
after a confirmed successful end.

- **Bug Fixes**
- Eliminated race conditions by gating processing on successful onEnd
(wasCancelled-aware), fixing a stale firstMessage closure, and clearing
the queue before cancel IPC to avoid rapid-response races.
- Preserved input and attachments when queueMessage fails; prevented
dropping newly queued messages; cleared editing state when the edited
queued item is deleted.

<sup>Written for commit fb431f55b3a24284058062a6ced97ac21f825952.
Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Introduces queued message support so users can submit another prompt
while a response is streaming; the queued prompt auto-sends only after
the current stream ends successfully.
> 
> - Adds `QueuedMessage`, `queuedMessageByIdAtom`, and
`streamCompletedSuccessfullyByIdAtom` to track one queued message and
confirmed stream completion per chat
> - Extends `useStreamChat` with queue APIs (`queuedMessage`,
`queueMessage`, `clearQueuedMessage`) and processing gated by `onEnd`
success; resets/sets completion flags; warns on multiple queue attempts
> - Updates `ChatInput` to queue while streaming, clear on successful
queue, and clear queued message on cancel; uses `shouldProcessQueue`
> - Updates `MessagesList` to display queued prompt with status and a
Clear action
> - Expands IPC `ChatResponseEnd` schema with optional `wasCancelled`;
send this flag on cancel in `chat_stream_handlers`
> - Adds e2e test `queued_message.spec.ts` verifying queuing and
auto-send behavior
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
62ed2131f7f9ee253b2542d35307459af504d6d0. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

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---------
Co-authored-by: Claude <noreply@anthropic.com>