🎨 Palette: 외부 링크에 접근성 경고 및 시각적 아이콘 추가

[seonghobae]

💡 무엇을: 외부 링크(target="_blank")에 스크린 리더용 경고 텍스트(.sr-only)와 시각적 아이콘(↗)을 추가했습니다.
🎯 왜: 스크린 리더 사용자가 새 창이 열린다는 사실을 미리 인지할 수 있도록 돕고, 시각 장애가 없는 사용자에게도 직관적인 피드백을 제공하여 사용성을 향상시킵니다.
♿ 접근성: 스크린 리더가 링크 컨텍스트 변경을 명확하게 알 수 있도록 .sr-only 텍스트를 제공하고 번역 가능한 형태로 구성했습니다.

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PR created automatically by Jules for task 12967670315213035325 started by @seonghobae

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📥 Commits

Reviewing files that changed from the base of the PR and between 2949d30 and 312f5e8.

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📒 Files selected for processing (2)

• .jules/palette.md
• scanner/dashboard/index.html

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