🎨 Palette: 스크린 리더 접근성 향상을 위한 ARIA 레이블 한국어 번역

[seonghobae]

💡 What: <nav aria-label="Directory listing">의 영문 레이블을 문서 언어(lang="ko")에 맞추어 <nav aria-label="디렉토리 목록">으로 수정했습니다.
🎯 Why: 스크린 리더가 한국어 문서에서 영문 ARIA 레이블을 읽을 때 발생할 수 있는 혼란이나 오발음을 방지하여 사용자 경험을 향상시킵니다.
📸 Before/After: 시각적인 변경 사항은 없습니다.
♿ Accessibility: 문서 언어와 일치하는 올바른 언어의 ARIA 레이블을 제공함으로써 한국어 스크린 리더 사용자의 접근성을 개선했습니다.

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PR created automatically by Jules for task 5951423413685362242 started by @seonghobae

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