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⚡ Bolt: 프론트엔드 DocumentFragment 적용으로 DOM 렌더링 성능 개선 - #686

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⚡ Bolt: 프론트엔드 성능 최적화 - DocumentFragment 적용

💡 What: 뷰어 데모 UI (demo.js)에서 renderHistory와 renderJobDetail 수행 시 다중 DOM 업데이트를 DocumentFragment를 사용해 일괄 처리하도록 변경했습니다.
🎯 Why: 루프 내에서 개별 엘리먼트를 매번 DOM 트리에 직접 appendChild할 경우 다수의 리플로우(reflow)와 리페인트(repaint)가 발생해 렌더링 성능이 저하되는 병목을 해결하기 위함입니다.
📊 Impact: 반복문 내 개별 요소 추가로 인한 다중 리플로우를 단일 리플로우로 최적화하여 긴 목록 렌더링 비용을 감소시킵니다.
🔬 Measurement: node --test src/test/js/*.test.mjs 및 UI 로드 시 렌더링 시간 프로파일링을 통해 검증 가능합니다.


PR created automatically by Jules for task 10253363837239367196 started by @seonghobae

….js`)에서 `renderHistory`와 `renderJobDetail` 수행 시 다중 DOM 업데이트를 `DocumentFragment`를 사용해 일괄 처리하도록 변경했습니다.\n🎯 Why: 루프 내에서 개별 엘리먼트를 매번 DOM 트리에 직접 `appendChild`할 경우 다수의 리플로우(reflow)와 리페인트(repaint)가 발생해 렌더링 성능이 저하되는 병목을 해결하기 위함입니다.\n📊 Impact: 반복문 내 개별 요소 추가로 인한 다중 리플로우를 단일 리플로우로 최적화하여 긴 목록 렌더링 비용을 감소시킵니다.\n🔬 Measurement: `node --test src/test/js/*.test.mjs` 및 UI 로드 시 렌더링 시간 프로파일링을 통해 검증 가능합니다.
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