🎨 Palette: 빈 디렉토리 상태 메시지에 role="status" 추가

[seonghobae]

💡 What: 생성된 디렉토리 트리의 "이 디렉토리는 비어 있습니다." 상태 메시지에 role="status" 속성을 추가했습니다.
🎯 Why: 기존 메시지는 시각적으로는 구별되나 스크린 리더에서는 단순 텍스트로 읽고 넘어갈 수 있어, 빈 상태(Empty State)라는 컨텍스트를 제대로 전달하기 위함입니다.
📸 Before/After:

• Before: <div class="empty-dir">이 디렉토리는 비어 있습니다.</div>
• After: <div class="empty-dir" role="status">이 디렉토리는 비어 있습니다.</div>
  ♿ Accessibility: 스크린 리더가 해당 요소를 상태 메시지로 올바르게 인식하고 사용자에게 안내할 수 있도록 향상되었습니다.

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PR created automatically by Jules for task 17219880337230985203 started by @seonghobae

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[Copilot]

Pull request overview

Adds ARIA semantics to the generated empty-directory message so assistive technologies can recognize it as a status message, and updates tests/docs accordingly.

Changes:

• Add role="status" to the empty-directory message element in generated index.html.
• Extend MainTest.testGoEmptyDir to assert the new ARIA role is present.
• Document the accessibility rationale/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-state message markup when a directory listing is empty.
src/test/kotlin/html4tree/MainTest.kt	Updates the empty-directory test to check for the new role attribute in generated HTML.
.jules/palette.md	Records the accessibility learning/action for adding role="status" to empty-state messaging.

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