🎨 팔레트: [UX 개선] 브라우저 번역 호환성을 위한 내비게이션 접근성 개선

[seonghobae]

💡 내용: <nav aria-label="디렉토리 목록">을 <nav aria-labelledby="nav-heading"> 및 시각적으로 숨겨진 <h2> 요소로 변경했습니다.
🎯 이유: 크롬 번역 등 브라우저 내장 번역 도구는 aria-label 속성을 번역하지 않는 경우가 있어 다국어 사용자의 접근성을 저해합니다. 이를 시각적으로 숨겨진 실제 텍스트 요소로 변경하여 번역 가능하게 개선했습니다.
📸 변경 전/후: 시각적인 변화는 없습니다. (내부 텍스트 요소는 .visually-hidden 클래스로 숨김 처리됨)
♿ 접근성: 브라우저 번역 도구를 사용하는 사용자의 스크린 리더 접근성이 개선되었습니다.

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PR created automatically by Jules for task 10896023883260375198 started by @seonghobae

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• .jules/palette.md
• src/main/kotlin/html4tree/main.kt
• src/test/kotlin/html4tree/MainTest.kt

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