Fixes #1006

Problem

When a network failure or any unhandled exception occurs during SearchAgent.searchAsync, the error is silently swallowed (the method is called without await in the route handler). This leaves the message in status: 'answering' in the database indefinitely. On reconnect, the frontend calls /api/reconnect/:backendId which returns 404 because the session is gone (especially after a server/container restart). Since the frontend didn't check res.ok, it tried to read the 404 response body as an SSE stream — nothing matched a known message type, so loading stayed true and the stuck "Brainstorming" state persisted, making all follow-up questions impossible.

Solution

Backend (src/lib/agents/search/index.ts)

• Wrap the entire searchAsync body in a try/catch
• On error: emit an error event to the session (so any active listener gets notified) and update the message status to 'error' in the database

Frontend (src/lib/hooks/useChat.tsx)

• After fetching /api/reconnect/:id, check res.ok before attempting to read the stream
• If the response is not OK (e.g. 404 session expired or server restarted), immediately set loading: false, clear the reconnect flag, and mark the message as 'error' so the user can retry

Testing

1. Start a search query
2. Kill the server mid-search (simulating network failure / container restart)
3. Restart the server and reload the page
4. Before fix: UI is stuck on "Brainstorming", no follow-up questions possible
5. After fix: Message shows error state, user can send a new message

Summary by cubic

Prevent chats from getting stuck in “Brainstorming” by handling search errors and stale reconnect sessions (fixes #1006). On failure, messages now enter an “error” state and the UI stops loading so users can retry.

• Bug Fixes
  • Backend: wrap searchAsync in try/catch; on error, emit error to the session and set the message status to error in the DB.
  • Frontend: on /api/reconnect/:id, check res.ok; on non-OK (e.g., 404), stop loading, clear reconnect, and mark the last message as error.

^{Written for commit b5e1d9f. Summary will update on new commits.}