⚡ Bolt: [성능 개선] 오프스크린 이미지에 fetchpriority="low" 적용

[seonghobae]

💡 What: loading="lazy"가 적용된 오프스크린 이미지 요소들에 fetchpriority="low" 속성을 추가했습니다. (index.html, 404.html)

🎯 Why: 브라우저의 프리로드 스캐너가 지연 로딩될 이미지를 발견했을 때 초기 렌더링에 필요한 다른 중요 리소스보다 먼저 스케줄링하는 것을 명시적으로 방지하여 렌더 패스를 최적화하기 위함입니다.

📊 Impact: 중요한 에셋 로딩의 네트워크 병목을 줄여 체감 초기 렌더링 성능을 개선합니다.

🔬 Measurement: 브라우저 개발자 도구의 Network 탭에서 초기 리소스 로딩 시 오프스크린 이미지의 우선순위(Priority)가 'Low'로 스케줄링되는지 확인합니다. 테스트 코드 커버리지가 100%를 유지합니다.

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PR created automatically by Jules for task 6349819135938458195 started by @seonghobae

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📒 Files selected for processing (4)

• .jules/bolt.md
• 404.html
• index.html
• tests/test_styles.py

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