The button was a sticky child of the scroll container, which reserves
composer-sized bottom padding. Sticky boxes are clamped by their
containing block's content box, so the 12px offset never applied and the
button parked 160px above the composer, on top of the transcript.
Anchor it to the composer wrapper's own top edge instead, so the offset
no longer depends on the --composer-reserve constant.
Co-authored-by: Cursor <cursoragent@cursor.com>
Jesse_Chen
6ce4e67186