The composer's primary button now reflects generation state: Send when idle,
Stop while generating with an empty draft, and Queue while generating with a
draft typed (submitting queues it via the existing queue path). Stop is
click-only so a stray Enter never interrupts a run. ChatInput gains generating
+ onStop props.
BooChat: removes the separate centered "Stop generating" pill and wires
generating={streaming} + onStop={handleStop}. BooCoder: generating now keys on
sending || activeTaskId (the dispatch POST is too brief on its own), which also
fixes the queue gates that previously fired mid-run; onStop cancels the active
task via the new api.coder.cancelTask, and the input is no longer disabled while
a task runs so follow-ups can be queued.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>