docs/style: Update Prisma and Svelte component rules, fix TaskList

[KATO-Hiro]

close #3460

Summary by CodeRabbit

リリースノート

• バグ修正

  • グレード別問題アコーディオンが正常に展開されない問題を修正。異なるコンテストに同じタスクIDが存在する場合の表示問題を解決しました。

• ドキュメント

  • データベース設計ガイドを更新。複数ソースからマージされたレコードにおける複合キーの使用要件を明確化。
  • コンポーネント開発ガイドを強化。キー付き反復における一意性と複合キーの重要性を追加。

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: eb867b74-5bec-4116-ade4-b40ae3edb1d4

📥 Commits

Reviewing files that changed from the base of the PR and between 124478e and ed88fc8.

📒 Files selected for processing (1)

• .claude/rules/svelte-components.md

📝 Walkthrough

Walkthrough

TaskListコンポーネントのeachブロックで、キー指定をtask_idのみからcontest_id + task_idの複合キーに変更しました。マージされたデータ内でタスクIDが複数のコンテストにまたがる場合に重複が生じることへの対応です。

Changes

Cohort / File(s)	Summary
実装修正 src/lib/components/TaskList.svelte	{#each} ブロックのキーを taskResult.task_id から taskResult.contest_id + '-' + taskResult.task_id の複合キーに変更。DOMの安定な識別を確保。
ドキュメント整備 .claude/rules/prisma-db.md, .claude/rules/svelte-components.md, docs/dev-notes/...	複合キー使用の必要性を記録： • Prisma層のマージ関数で重複値が生じる可能性を明記 • Svelteコンポーネント内での複合キー指定を推奨 • バグ修正計画と検証手順を文書化

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🎪 contest_id と task_id が手を取り合い、
DOM 要素たちは安心して踊る 🩰
ドキュメントにもルール記され、
グレード別アコーディオン、もう迷わず展開！ ✨

🚥 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	タイトルはPrisma・Svelte・TaskListの変更を指しており、PR全体の主な変更内容を正確に要約している。
Linked Issues check	✅ Passed	PR #3461は課題 #3460の「グレード別展開されないバグ」に対応し、TaskListのeachキーを合成キーに変更してDOM再調和を修正している。
Out of Scope Changes check	✅ Passed	prisma-db.md、svelte-components.mdの規則更新はTaskListの修正に必要な背景ルール整備で課題範囲内。外部無関係な変更はない。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch #3460

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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 @.claude/rules/svelte-components.md:
- Line 40: Update the composite key example currently written as `contest_id +
task_id` to include an explicit separator (e.g. `contest_id + ':' + task_id` or
`contest_id + '-' + task_id`) so it matches the representation used in the
"Common Trap" section and the TaskList.svelte implementation; change the text on
the earlier example to mention using a delimiter to avoid collisions and ensure
the example on Line 40 and the example on Line 52 use the same delimiter style.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: b373942b-9b46-42d8-97a9-029c1e3d04dc

📥 Commits

Reviewing files that changed from the base of the PR and between c4fd3c1 and 124478e.

📒 Files selected for processing (4)

• .claude/rules/prisma-db.md
• .claude/rules/svelte-components.md
• docs/dev-notes/2026-04-26/fix-grade-accordion-each-key/plan.md
• src/lib/components/TaskList.svelte

[KATO-Hiro]

LGTM