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fix(observability): JankTracker 스레드 경합 크래시 수정 - #662
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onFrame 은 FrameMetrics HandlerThread, onScreenChanged 는 메인 스레드에서 호출되는데 같은 ArrayList·카운터를 동기화 없이 바꿔 closeWindow 의 정렬이 NPE·IndexOutOfBounds 로 죽었다. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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작업 내용
JankTracker.onFrame·onScreenChanged에@Synchronized를 붙여 상태 접근을 직렬화한다.JankTracker.closeWindowNPE·IndexOutOfBoundsException 원인:onFrame은 FrameMetricsHandlerThread,onScreenChanged는 메인 스레드에서 같은ArrayList를 동시에 변경.Closes #661
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