The panes grid had no explicit row, so the implicit `auto` row sized to its
tallest pane's content. With Provenance + Tags + a long Suggestions list, the
rail outgrew the fixed-height workspace, spilled over and made the WHOLE page
scrollable — showing as a weird empty gap at the top (operator-flagged
2026-06-26). grid-template-rows: minmax(0, 1fr) bounds the row to the container
so each pane's own overflow-y:auto scrolls internally instead. Reset to `none`
in the stacked (<=1100px) layout where the page is meant to scroll.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
bvandeusen