🛡️ Sentinel: [MEDIUM] 404.html 외부 링크 접근성 및 다국어 지원 속성 누락 수정

[seonghobae]

🚨 Severity: MEDIUM
💡 Vulnerability: 404 페이지 내 외부 링크에 다국어 및 접근성 속성 누락
🎯 Impact: 스크린 리더 사용자에게 새 창 열림 정보 미제공 및 언어 전환 시 툴팁 미반영
🔧 Fix: 404.html 링크에 aria-describedby, title, data-i18n-title 속성과 공통 visually-hidden span 요소 추가
✅ Verification: 404.html을 렌더링하고 테스트 코드를 통해 속성 존재 유무 검증

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PR created automatically by Jules for task 16589966766973166625 started by @seonghobae

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📥 Commits

Reviewing files that changed from the base of the PR and between 7c4251d and f69674c.

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📒 Files selected for processing (3)

• .jules/sentinel.md
• 404.html
• tests/test_external_links.py

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• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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