🎨 Palette: 빈 디렉토리 상태 메시지에 접근성 개선 추가

[seonghobae]

💡 What: 빈 디렉토리 상태를 나타내는 <div> 요소에 role="status" ARIA 속성을 추가했습니다.
🎯 Why: 스크린 리더 사용자가 시각적으로 비어 있음을 나타내는 텍스트를 인지하기 어렵기 때문에 상태 메시지를 명확히 전달하기 위함입니다.
📸 Before/After: <div class="empty-dir">...</div> -> <div class="empty-dir" role="status">...</div>
♿ Accessibility: 정적 HTML에서도 상태 메시지에 role="status"를 부여하여 접근성을 향상시켰습니다.

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PR created automatically by Jules for task 572414385812584952 started by @seonghobae

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[Copilot]

Pull request overview

This PR improves the accessibility of html4tree’s generated directory listing HTML by marking the empty-directory message as a status message for assistive technologies.

Changes:

• Add role="status" to the empty-directory message element in generated index.html.
• Update MainTest.testGoEmptyDir to check for the new role="status" attribute.
• Record the accessibility learning/action in .jules/palette.md.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/main/kotlin/html4tree/main.kt	Adds role="status" to the empty-directory message markup.
src/test/kotlin/html4tree/MainTest.kt	Adds an assertion to verify the presence of role="status" in generated HTML.
.jules/palette.md	Documents the accessibility improvement as a Palette learning/action entry.

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