refactor(studio): extract timeline render contracts#2699
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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
Extract timeline rendering contracts and orchestration helpers needed by viewport virtualization.
Why
The original Timeline component mixed view-model construction, lane contracts, tick generation, selection lifecycle, modifier state, and player synchronization. Virtualization needs those decisions to have explicit owners without introducing parallel geometry or state paths.
How
This is D4 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 PRs #2635 and #2636, which remain open for audit until landing.
Test plan
Validated on the exact Family D tip through Timeline and timeline-layout coverage, the full Studio suite, both package typechecks, formatting, lint, file-size checks, and the strict 50,000-element Chromium gate.