🎨 Palette: [UX improvement] 다국어 지원 내비게이션 라벨 및 모바일 탭 피드백 추가

[seonghobae]

💡 What: <nav> 요소의 aria-label을 aria-labelledby와 시각적으로 숨겨진 <h2> 태그로 교체하고, <a> 태그에 :active CSS 속성을 추가하여 클릭 피드백을 제공합니다.
🎯 Why: aria-label 속성은 브라우저 자동 번역기(Chrome 번역 등)에서 번역되지 않아 외국어 사용 스크린 리더 환경에서 원래 언어로 읽히는 문제가 있었습니다. 이를 시각적으로 숨겨진 HTML 텍스트로 대체하여 번역 호환성을 확보했습니다. 또한 모바일 디바이스 등 터치 환경에서 링크를 탭할 때 즉각적인 시각적 피드백(:active 색상 변화)을 제공하여 사용성을 높였습니다.
📸 Before/After: 시각적으로 숨겨진 텍스트라 화면 표시는 동일하며, 링크 클릭/탭 시 약간 더 어두운/밝은 테마 색상으로 반응합니다.
♿ Accessibility: 내비게이션 랜드마크가 이제 스크린 리더 사용자뿐만 아니라 브라우저 번역기를 사용하는 모든 장애/비장애 사용자에게 적절한 현지화된 라벨을 제공합니다.

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PR created automatically by Jules for task 17983517578193896445 started by @seonghobae

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📥 Commits

Reviewing files that changed from the base of the PR and between de82f99 and 0cfd236.

📒 Files selected for processing (3)

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

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