The fenced code card's scroller (CodeCardBody / ExpandableBlock) carries
`.scrollbar-overlay`, which hands the card's right edge back to the
platform's ~15-17px scrollbar lane. The hover copy control sat at a 6px
inset with a 10px icon, inside that lane and on top of the bar itself.
Inset it 16px and use the 12px icon the other corner copy controls use
(log-tail.tsx).
Salvaged from #110548 without its className change-detector test; the fix
is pure CSS (Tailwind inset/icon size) and is verified by a static trace
against the .scrollbar-overlay scroller.
David Metcalfe
6e04bf8e59