🎨 Palette: 빈 디렉토리(Empty State)의 UI 일관성 및 접근성 개선

[seonghobae]

💡 What: 빈 디렉토리를 안내하는 텍스트에 폴더 아이콘을 추가하고 Flexbox 정렬을 적용했으며, ARIA role="status"를 부여했습니다.
🎯 Why: 기존에는 빈 상태가 일반 리스트 아이템과 시각적으로 다르게 보여 일관성이 떨어졌으며, 스크린 리더 환경에서는 단순히 텍스트만 읽혀 상태 변화에 대한 명확한 인지가 부족했습니다.
📸 Before/After: 변경 전 <li><div class="empty-dir">이 디렉토리는 비어 있습니다.</div></li> 에서 변경 후 아이콘(📂) 및 Flexbox 레이아웃 적용.
♿ Accessibility: role="status"를 추가하여 스크린 리더 사용자가 현재 폴더에 항목이 없음을 즉시 인지하도록 개선했으며, 장식용 폴더 아이콘에는 aria-hidden="true"를 적용하여 혼동을 방지했습니다.

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PR created automatically by Jules for task 4823324895692884004 started by @seonghobae

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[Copilot]

Pull request overview

Improves the generated directory listing HTML’s empty-state rendering so it visually aligns with regular list items and is more accessible for screen readers.

Changes:

• Render an empty directory entry with a folder icon and flex layout, and add role="status" for clearer announcement.
• Update the CSS for .empty-dir to use flexbox alignment and spacing.
• Extend the empty-directory test assertions and document the learning 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 flex styling for .empty-dir and updates empty-state markup to include an icon and role="status".
src/test/kotlin/html4tree/MainTest.kt	Adds assertions to validate the new empty-state accessibility/markup.
.jules/palette.md	Records the accessibility/UI consistency learning and action item for empty states.

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