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Perf/grid scroll bench - #15
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Every visible cell built a hidden copy Button (icon, tooltip, group hover) and revealed it on hover; on a wide result that was half of each scrolling frame. Now only the cell under the pointer builds it, and the rest reserve its width so nothing reflows when the pointer arrives. Draw time per frame while scrolling (M5, 120 Hz, 1440x900): 100k x 8, 40 px/frame 5.3 -> 3.2 ms 100k x 8, 800 px/frame 6.3 -> 3.9 ms 60k x 30, 40 px/frame 7.9 -> 3.8 ms 60k x 30, 800 px/frame 9.1 -> 5.3 ms (was missing the 8.3 ms budget) Adds `ducklocal __scroll-bench` behind the `scroll-bench` feature: it scrolls the grid in a real window and reports GPUI's own frame trace (wheel dispatch, draw, present, frame interval). Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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