Prepare side threads off the TUI event loop#26754
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This PR fixes a deadlock that can occur when the TUI prepares a side conversation. Specifically, this can occur if the main thread generates many events in a short period of time when the side preparation takes a long time because of a slow fork operation.
Previously,
/sidewaited for the fork and boundary-injection requests on the main event loop. App-server responses and notifications share a bounded transport, so a notification backlog could block the fork response while the TUI was no longer draining notifications. The backend would keep running, but the TUI could stop rendering and reading input permanently.Changes
Esc, restore the pending message, and clean up the unused side thread if the fork completes afterward.Verification
/sideTUI snapshot to cover the read-only composer and cancellation hint.