React onChange fires during IME composition in controlled inputs

In a controlled <input>/<textarea>, onChange fires for the intermediate keystrokes of an IME composition, so any onChange-driven search or filter runs on half-finished CJK text.

Type Chinese/Japanese through an IME into a controlled input that filters on onChange; the handler runs on every uncommitted composition keystroke.

Track compositionstart/compositionend and suppress onChange handling while a composition is active.