fix: prevent composer layout feedback loop by deferring state updates#23672
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Remove the measuredHeight binding that bounced layout state through SwiftUI and defer focus-binding and first-responder mutations to the next run-loop tick via DispatchQueue.main.async. Both schedulers use a pending-value guard to coalesce rapid changes and avoid stale updates.
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Summary
measuredHeightbinding —IntrinsicScrollView.contentHeightnow drives sizing directly, avoiding a SwiftUI state round-trip during layoutscheduleFocusBindingUpdate/scheduleFirstResponderUpdate, preventing writes to@BindingduringupdateNSView