When a follow-up message is queued during a busy turn, the composer
clears and the primary button switches back to the Stop affordance. But
clicking Stop ran interruptAndSendNextQueued(), which cancelled the turn
and *immediately* re-sent the head of the queue. The auto-drain effect
(busy true to false) compounded this: any explicit cancel flipped busy
false and re-fired the queue. The net effect was that Stop appeared to
never interrupt -- the agent kept running on the queued prompt.
Fix:
- Stop button (busy + empty composer) now always performs a pure
interrupt via onCancel(); it no longer hijacks the queue.
- An explicit interrupt latches userInterruptedRef so the busy to false
auto-drain skips exactly one drain. Queued turns are preserved and the
user resumes them deliberately (Cmd/Ctrl+K, Enter, or the per-row
send-now arrow), matching the documented Esc=cancel / Cmd+K=send-next
affordances.
- Extracted the settle decision into shouldAutoDrainOnSettle() with unit
tests covering natural completion vs. explicit interrupt.
a23728dfcc