## Description
Resolves a race condition in the Ask AI feature where the first
assistant reply in a newly created thread does not stream into the UI
and only appears after sending a second message.
### What's Changed
- **Immediate Thread Subscription:** Updated `useAgentChat.ts` to
immediately set `currentAiChatThread` to the newly generated `threadId`
instead of deferring it until after the `SEND_CHAT_MESSAGE` mutation
finishes.
- **The Bug:** Previously, the backend worker processed the AI chat job
so quickly that the stream completed and fired the `message-persisted`
event *before* the frontend established the SSE subscription.
- **The Fix:** By setting the thread ID immediately, the
`useAgentChatSubscription` hook now properly connects and listens to the
SSE stream before the backend begins emitting chunks, guaranteeing the
first message streams seamlessly.
### How to Test
1. Open the Ask AI panel and start a completely new thread.
2. Send an initial message (e.g., "Hello!").
3. Observe that the AI's response successfully streams into the chat
without needing a workaround or page refresh.
Closes#21694
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Co-authored-by: Etienne <45695613+etiennejouan@users.noreply.github.com>
Akash!
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