ユーザー作成時のエラーハンドリングを改善し、リソースエラーコードに基づく詳細なエラーメッセージを追加

[yuito-it]

Summary by CodeRabbit

バグ修正

• ユーザー作成時のエラー表示を改善しました。ユーザー名やメールアドレスの競合時に、より具体的で識別しやすいエラーメッセージが返されるようになりました。
• 認証失敗時のエラーハンドリングを一貫化し、予期しない 401 応答についても安定して適切なエラーが発生するようにしました。
• 内部の整理を行い、動作や画面表示に影響を与えない軽微な変更を適用しました。

[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

Run ID: 8c923aef-11eb-4de2-a393-239d0c84acd7

📥 Commits

Reviewing files that changed from the base of the PR and between 5484bed and 01441d5.

📒 Files selected for processing (1)

• src/classes/User.ts

🚧 Files skipped from review as they are similar to previous changes (1)

• src/classes/User.ts

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📝 Walkthrough

Walkthrough

インポート順序と型宣言の微調整が行われ、User.createのHTTP 409ハンドリングがレスポンスJSONのcodeに基づく具体的な競合エラー判定へ変更され、認証処理の401分岐が既知理由以外でも確実にInvalidCredentialsを投げるよう修正されました。

Changes

Cohort / File(s)	Summary
インポート順・型指定 src/app/dashboard/page.tsx, src/components/Cards/OtherServices/index.tsx	アイコンやコンポーネントのimport順を整理。OtherServiceCardPropsをtype指定の型インポートに変更（page.tsx）。実行時ロジックは不変。
User クラスの409ハンドリング src/classes/User.ts	User.createの409ブランチでレスポンスをJSON解析（安全なtry/catch）し、codeフィールドをResourceApiErrorCodesと照合してUsernameAlreadyExists/EmailAlreadyExists等の具体的な例外にマップするよう変更。
認証エラーの確定的な扱い src/libs/authentication.ts	401レスポンスの処理で、既知のreasonに該当しない場合も確実にAuthenticationErrors.InvalidCredentialsをスローするよう変更（制御フローの明確化）。

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	プルリクエストのタイトルは、ユーザー作成時のエラーハンドリング改善とリソースエラーコードに基づく詳細なエラーメッセージ追加という主要な変更を明確に説明しており、変更内容と完全に関連している。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

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• Commit unit tests in branch fix/user-create-dup-error

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[yuito-it]

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@src/classes/User.ts`:
- Around line 154-164: The 409 handling assumes response.json() yields an object
and directly accesses errorData.code, which can throw on non-object or parse
failure; wrap the JSON parse in a try/catch and defensively extract the code
(e.g., let code = parsed && typeof parsed === "object" ? parsed.code :
undefined), then switch on that code (checking equality with
ResourceApiErrorCodes.UsernameAlreadyExists / EmailAlreadyExists) and fall back
to throwing ResourceApiErrors.ResourceAlreadyExists for any unknown/absent code;
update the case 409 block in User.ts to use this safe parsing and fallback logic
around response.json()/errorData.

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Fix all unresolved CodeRabbit comments on this PR:

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: dad8866f-9bbf-4f42-ab24-1a8b80672f43

📥 Commits

Reviewing files that changed from the base of the PR and between b066b53 and 5484bed.

📒 Files selected for processing (4)

• src/app/dashboard/page.tsx
• src/classes/User.ts
• src/components/Cards/OtherServices/index.tsx
• src/libs/authentication.ts