⚡ Bolt: [성능 개선] EventList 렌더링 최적화

[seonghobae]

💡 What: react-window 내부 가상화 루프에서 날짜 파싱 제외
🎯 Why: 잦은 스크롤 시 불필요한 연산 방지
📊 Impact: 렌더링 성능 대폭 향상
🔬 Measurement: 스크롤 렌더링 시 시간 측정 감소 확인

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PR created automatically by Jules for task 6442299853961159529 started by @seonghobae

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