perf(desktop): use useDeferredValue for Transcript items#2956
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…t responsive During streaming, every text/reasoning delta triggers a state update that re-renders the entire Transcript. If the user is typing in the Composer at the same time, the transcript re-render can block the keystroke from being processed — causing visible input lag. Wrap state.items in useDeferredValue before passing to Transcript. This tells React to treat transcript updates as low-priority: when a keystroke and a transcript update collide, the keystroke is processed immediately and the transcript re-render is deferred to idle time.
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Wrap state.items in
useDeferredValueso Composer input (high-priority) renders before Transcript (low-priority) during streaming.