🎨 Palette: 빈 디렉토리 이름(루트 디렉토리 등) 폴백 처리로 접근성 향상

[seonghobae]

💡 What: 디렉토리 이름이 비어 있을 때(예: 파일시스템 루트) 절대 경로를 사용하도록 폴백을 추가했습니다.
🎯 Why: 빈 <title>과 <h1> 태그는 스크린 리더 사용자에게 컨텍스트를 제공하지 못하여 접근성 문제를 일으킵니다.
📸 Before/After: 해당 없음 (시각적 구조 변경보다는 DOM 노드 컨텐츠 변경에 중점)
♿ Accessibility: 빈 이름을 방지하여 스크린 리더가 내비게이션 트리의 현재 위치를 올바르게 읽을 수 있도록 보장합니다.

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PR created automatically by Jules for task 8913576277332354294 started by @seonghobae

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[Copilot]

Pull request overview

This PR improves the accessibility of generated directory listing pages by ensuring the HTML <title> and <h1> never render as empty when a directory’s name is empty, falling back to the directory’s absolute path instead. This aligns with html4tree’s goal of generating safe, usable static index.html listings.

Changes:

• Add an empty-name fallback (absolutePath) for the generated page <title> and <h1> in process_dir.
• Add a regression test covering the empty directory name fallback behavior.
• Record the learned accessibility guideline in .jules/palette.md.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/main/kotlin/html4tree/main.kt	Uses curr_dir.name.ifEmpty { curr_dir.absolutePath } for <title> and <h1> to avoid empty headings.
src/test/kotlin/html4tree/MainTest.kt	Adds a test that simulates an empty directory name and asserts fallback content is present in the generated HTML.
.jules/palette.md	Documents the learning/action about handling empty directory names to prevent empty <title>/<h1> for accessibility.

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