Root-caused mara's 'no interrupt button on agent term anymore' report:
the pre-rewrite app.js had a visible <button id=cancel-btn> (class
btn-cancel-turn, already-styled CSS still in agent.css but orphaned)
shown only while a turn was in flight, wired to /api/cancel. The
Preact rewrite (agent terminal Preact rewrite) ported the /cancel
slash command but never re-added the visible button, so interrupting
a turn now requires typing a command instead of clicking.
Adds thinking/onCancelTurn props to StatusChips, rendering the same
btn-cancel-turn markup only while turn_state === thinking, wired to
the existing postCancelTurn() (termActions.ts) + refresh(). Verified
with real headless-chromium screenshots against a mock /api/state:
button renders while thinking, is absent while idle.
b753ec2093