perf(studio): centralize timeline viewport geometry#2700
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This was referenced Jul 21, 2026
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This was referenced Jul 21, 2026
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What
Make one timeline viewport geometry model own scroll, drag, selection, layout, and playback coordinate conversion.
Why
Independent coordinate calculations drift under zoom, gutters, horizontal scrolling, and virtualization. A single geometry owner keeps pointer placement, visible ranges, track layout, playhead movement, and store state aligned.
How
This is D5 of the independent Family D draft Graphite stack. Its review base is the immutable, PR-less Family C baseline; Families A-C do not need to merge for this PR to be reviewed. It supersedes legacy PR #2637, which remains open for audit until landing.
Test plan
Validated on the exact Family D tip with geometry, scrolling, track-layout, element-index, player-store, and Timeline tests plus the full Studio/Server suites, typechecks, static gates, and two strict 50,000-element Chromium passes.