perf(timeline): gate heavy message render behind useDeferredValue#1022

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Commits on Jun 12, 2026

perf(timeline): gate heavy message render behind useDeferredValue

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Commits on Jun 14, 2026

test(timeline): lib-cover Phase A must-keep decisions + no-tearing guarantee

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perf(timeline): gate thread side pane render behind useDeferredValue (A.2)

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style(timeline): apply biome formatter to thread pane pending branch

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refactor(timeline): rename to timelineSnapshot + collapse messageTimelineUtils no-op

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