Allow for decision-card reflow in the resized-tab scroll check

The decision cards at the foot of the scroller wrap to more lines at 320px
than the old card did, so the bottom distance settles at 40px (was exactly
24px). Bound it at 64px; a moved document is hundreds of pixels.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>