The queue auto-send gate treated a missing session status entry as idle,
but the server's /session/status map only lists busy/retry sessions — a
missed busy event leaves no entry while a turn is still streaming. On a
client that missed the busy event (e.g. mobile reconnect window), queued
follow-ups were dispatched into the running turn; OpenCode then merged
both prompts into one model response instead of serializing them.
Extract resolveQueuedSessionStatusType and mirror useSessionActivity's
fallback: a trailing in-flight assistant message means the session is
still busy, so the queue waits for the real idle edge. Subscribe the
effect to messages so the queue drains as soon as the turn completes
even when status events were missed.
Serhii Dziupin
fe331c093b