perf(studio): schedule adaptive timeline thumbnails#2716
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This was referenced Jul 21, 2026
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What
Add an adaptive scheduler and user preference for timeline thumbnails.
Why
Thumbnails materially improve recognition, but eager generation for every off-screen clip wastes CPU, memory, and server work.
How
Centralize thumbnail policy, priority, leases, and bounded scheduling; wire the toolbar preference and render-content eligibility through that single policy. This is the first PR in sibling Family G, independently rooted on the immutable Family E review baseline.
Test plan
Family G tip validation: 78 changed-surface Studio tests, 19 focused server tests, 3,026 full Studio tests, 406 full Studio Server tests, both typechecks, format, lint, file-size gate, and full workspace build.