perf(toc): 역순 탐색 조기 종료 및 불필요한 getBoundingClientRect 호출 제거 - #89
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- useActiveHeading에서 헤딩 목록을 역순(Bottom-up)으로 탐색하여 활성선 기준점 이하의 첫 헤딩 발견 시 즉시 조기 종료(Early-break) 적용 - 긴 포스트 스크롤 시 상단 헤딩들의 불필요한 DOM 측정(Reflow) 방지 - 동일 ID 상태 변경 방지 가드 추가 및 조기 종료 동작 검증 단위 테스트 추가
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useActiveHeading에서 헤딩 목록을 역순(Bottom-up)으로 탐색하여 활성선 기준점(0.35) 이하의 첫 헤딩 발견 시 즉시 조기 종료(break) 적용getBoundingClientRect()(강제 Reflow) 반복 호출 방지tests/use-active-heading.test.tsx) 추가