🎨 Palette: ヘッダーボタンのキーボードフォーカス時の視認性向上

[is0692vs]

💡 What:
ヘッダー内にある「ログアウト」ボタンおよび「GitHubでログイン」ボタンに対して、キーボード操作でフォーカスを当てた際に表示されるアウトラインスタイル（focus-visible:ring-2 など）を追加しました。

🎯 Why:
マウス操作時にはホバー時の背景色変化があるものの、Tabキーなどを用いたキーボードナビゲーションを行なった際に現在どのボタンにフォーカスが当たっているかが視覚的に分かりにくかったためです。この修正により、キーボードユーザーがより直感的に操作できるようになります。

📸 Before/After:

• Before: キーボードでフォーカスを当てても、ブラウザデフォルトのアウトラインのみ、または変化がわかりにくい状態でした。
• After: フォーカス時に明確なリング（ring-2）が表示され、現在位置を容易に特定できるようになりました（ダークモードにも対応）。

♿ Accessibility:
キーボード操作時の視認性（WCAG 2.4.7 Focus Visible）を向上させました。

（関連する学びは .Jules/palette.md にも記録しています）

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PR created automatically by Jules for task 11463762630751538543 started by @is0692vs

Greptile Summary

ヘッダー内の「ログアウト」ボタンと「GitHubでログイン」ボタンに、キーボードフォーカス時の視認性を高める focus-visible スタイルを追加したアクセシビリティ改善 PR です。両ボタンに focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-offset-2 focus-visible:ring-gray-900 を追加し、ダークモード向けに dark:focus-visible:ring-white dark:focus-visible:ring-offset-gray-950 も付与しています。

Confidence Score: 5/5

アクセシビリティの改善のみで、既存の機能に影響を与えない安全な変更です。

変更内容はスタイルクラスの追加のみで、ロジックや状態管理への影響はありません。ダークモードの ring-offset 色はヘッダーの実際の背景色と整合しており、両ボタンで同一のスタイルパターンが使われています。

特に注意が必要なファイルはありません。

Important Files Changed

Filename	Overview
apps/web/src/components/header.tsx	ログアウト・ログインボタンに focus-visible スタイルを追加。実装パターンは正しく、ダークモード対応も適切。
.Jules/palette.md	キーボードナビゲーション時の focus-visible スタイルに関する学習メモを追記。ドキュメントのみ変更で問題なし。

_{Reviews (1): Last reviewed commit: "🎨 Palette: Header buttons focus styles" | Re-trigger Greptile}

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📥 Commits

Reviewing files that changed from the base of the PR and between 563ff80 and c7c073f.

📒 Files selected for processing (2)

• .Jules/palette.md
• apps/web/src/components/header.tsx

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[github-actions]

このリポジトリでは staging 先行フローを採用しています。PR のターゲットを staging に変更しました。staging で動作確認後、staging → main の PR を作成してください。

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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[gemini-code-assist]

Code Review

This pull request improves keyboard navigation accessibility by adding focus-visible ring styles to the login and logout buttons in the header component. Additionally, it documents this accessibility improvement as a new learning and action item in .Jules/palette.md. There are no review comments, so I have no feedback to provide.

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[is0692vs]

Closing as superseded by the newer clean Header focus PR #1118. Both modify the same header interactions for the same accessibility outcome.