feat(studio): expose timeline treegrid semantics#2713
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This was referenced Jul 21, 2026
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What
Expose the timeline as an accessible treegrid with stable semantic row and cell identities.
Why
Screen readers and keyboard users need the same hierarchy users see visually, including tracks, clips, and expanded property lanes.
How
Apply treegrid roles and levels across virtualized rows, centralize navigation identity generation, and cover the rendered accessibility structure in timeline tests.
Test plan
Family F tip validation: 200 focused timeline/navigation tests, 3,012 full Studio tests, Studio typecheck, format, lint, file-size gate, and full workspace build.