The quick chat stop button reused ChatView's `.chat-input-stop` class, which
sizes itself with `--chat-input-control-size` — a variable defined on
`.chat-input-row` in the ChatView composer and undefined in the quick chat DOM.
The invalid var collapsed the button's width (and mobile min-width) toward its
icon, leaving it noticeably narrower than the send button it replaces.
Pin the stop button to the send button's square dimensions with a compound
selector using globally-scoped spacing tokens, so it outranks the single-class
base and mobile rules from both stylesheets.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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