Update gallery default fixture

Gallery: show GT "answer-key" edit-diff for editing fixtures

Rename fixture-named result keys to sample-named keys

leaderboard: gallery editing samples -> 229 (medium), 207 (hard)

leaderboard: tighten mobile gallery box to a single scroll

leaderboard: mobile uses the same aligned table as desktop

leaderboard: dedicated mobile card layout for the gallery

leaderboard: fix mobile gallery (GT row wrap + double scroll)

leaderboard: reclaim Gradio chrome + responsive mobile gallery

leaderboard: squeeze header/caption, grow gallery to show more rows

leaderboard: bigger gallery box + scroll affordance

leaderboard: widen gallery chrome reserve to kill residual outer scroll

leaderboard: gallery scroll box sized off screen.availHeight

leaderboard: make the gallery the single scroller

leaderboard: lock GT row via in-iframe scroll capped by max-height

leaderboard: lock GT row + header in a capped gallery scroll box

leaderboard: fixed 4-sample gallery, auto-size iframe, center modal

leaderboard: rename tabs, relabel fixtures as samples, inline gallery row stats

leaderboard: show edit-diff turntable in gallery grid for editing fixtures

Serve rotating WebP turntables + GT generator

gallery: searchable fixture picker, URL-persisted picks, cached render proxies

add visual Gallery tab (top-10 verified, sticky GT, fixture picker)