🎨 Palette: [UX improvement] Add generic fallback for empty root directory names

[seonghobae]

💡 What: Added a generic fallback (/) for directory names when File.getName() returns an empty string (e.g. for root directories).
🎯 Why: Root directories return empty strings for their names. Generating HTML with empty <title> and <h1> tags breaks screen reader accessibility and looks broken visually.
📸 Before/After: Before: Empty title/heading. After: Displays /.
♿ Accessibility: Screen readers will now announce / instead of being silent or confused by empty semantic tags.

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PR created automatically by Jules for task 12596277149925357841 started by @seonghobae

Summary by CodeRabbit

• 접근성 개선

  • 루트 디렉터리에서 생성되는 HTML의 제목과 헤더가 비어 있지 않고 /로 표시됩니다.
  • 서버의 절대 경로가 대체 텍스트로 노출되지 않습니다.

• 버그 수정

  • 디렉터리 이름이 없는 경우에도 페이지 표시명이 일관되게 제공됩니다.

• 테스트

  • 루트 디렉터리의 제목과 헤더 표시를 검증하는 테스트를 추가했습니다.

[google-labs-jules]

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 6300bf09-abae-41fb-8d55-141d66fa0f74

📥 Commits

Reviewing files that changed from the base of the PR and between 29e1534 and d13aad7.

📒 Files selected for processing (3)

• .jules/palette.md
• src/main/kotlin/html4tree/main.kt
• src/test/kotlin/html4tree/MainTest.kt

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📝 Walkthrough

Walkthrough

루트 디렉터리의 빈 이름을 /로 대체합니다. 생성된 HTML의 <title>과 <h1>에 대체 표시명을 사용합니다. 관련 테스트와 접근성 지침을 추가합니다.

Changes

루트 디렉터리 표시명

Layer / File(s)	Summary
표시명 대체 및 검증 src/main/kotlin/html4tree/main.kt, src/test/kotlin/html4tree/MainTest.kt, .jules/palette.md	process_dir는 빈 디렉터리 이름을 /로 변환합니다. 생성된 <title>과 <h1>은 변환된 표시명을 사용합니다. 루트 디렉터리 테스트가 이 동작을 검증합니다. 접근성 지침은 절대 경로를 대체 텍스트로 사용하지 않도록 명시합니다.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• ContextualWisdomLab/html4tree#282: process_dir의 빈 루트 이름 대체값을 다룹니다.
• ContextualWisdomLab/html4tree#300: 생성된 <title>과 <h1>의 루트 이름 대체를 다룹니다.
• ContextualWisdomLab/html4tree#371: 절대 경로 대신 /를 사용하는 변경과 관련됩니다.

Suggested reviewers: copilot

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	제목은 빈 루트 디렉터리 이름에 대한 일반 대체값 추가라는 주요 변경 사항을 명확하고 간결하게 설명합니다.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/palette-root-dir-fallback-12596277149925357841

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