ui: add links and descriptions for vote (#3399)

[KATO-Hiro]

close #3399

Summary by CodeRabbit

リリースノート

• 新機能
  • 投票機能を実装しました。ユーザーは問題の難易度に投票でき、コミュニティの投票によって難易度の評価と分類が改善され、問題集の作成・更新が加速します。新しい投票ページにアクセスできるようになりました。

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: d9f06d59-15b4-4d55-974c-c6007efe7660

📥 Commits

Reviewing files that changed from the base of the PR and between 76cc52d and 9f90992.

📒 Files selected for processing (1)

• src/routes/+page.svelte

📝 Walkthrough

Walkthrough

トップページに投票機能への導線を追加。ドキュメント、定数、ページコンポーネントを更新し、コミュニティが投票を通じて問題集を育てる機能を実装しました。

Changes

コホート / ファイル(s)	概要
ドキュメント・定数更新 README.md, src/lib/constants/product-info.ts	投票機能による問題集成長の説明を追加。コミュニティ投票が難易度評価・分類を加速させることを文書化。
ページ実装 src/routes/+page.svelte	投票セクション新規追加（見出し・説明テキスト・キャロセル・ボタン）、投票関連画像配列追加、重複するマークアップをスニペット化（featureWithTitle、carouselWrapper）して構造を最適化。ナビゲーションリンクに VOTES_PAGE を追加。

推定コード見直し時間

🎯 2 (Simple) | ⏱️ ~12 分

• README・定数：文言追加のみ（Low）
• ページコンポーネント：新セクション・スニペット追加で軽微な構造変更（Simple）

詩

🗳️ コミュニティの声が集まり
問題集は生き生きと育つ
投票の力で、難易度も分類も
すくすくと加速する
みんなの知恵が花開く ✨

🚥 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	PRタイトルはトップページに投票ページへの導線を追加することを明確に述べており、変更内容と一致しています。
Linked Issues check	✅ Passed	変更内容がissue #3399の要件を完全に満たしており、UIに投票ページへの複数の導線（リンク、説明、セクション）を追加しています。
Out of Scope Changes check	✅ Passed	README.md、constants/product-info.ts、routes/+page.svelteの全変更が投票機能の説明と導線追加に関連しており、スコープ内です。
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 #3399

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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/routes/`+page.svelte:
- Around line 126-129: Extract the hard-coded spreadsheet URL used in the
ExternalLinkWrapper into a named constant (e.g., SHEET_URL) in a shared
constants module (e.g., urls export), then import that constant into the
component and replace the inline string passed to ExternalLinkWrapper with the
constant; update any references to use the new constant name and ensure the
constant export is named and documented for reuse.

🪄 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: 05ed5292-8b0e-4131-bcbc-9309783b02e7

📥 Commits

Reviewing files that changed from the base of the PR and between 7c5c4a7 and 76cc52d.

⛔ Files ignored due to path filters (4)

• static/contest_table.png is excluded by !**/*.png
• static/vote.png is excluded by !**/*.png
• static/vote_details.png is excluded by !**/*.png
• static/vote_from_contest_table.png is excluded by !**/*.png

📒 Files selected for processing (3)

• README.md
• src/lib/constants/product-info.ts
• src/routes/+page.svelte

[KATO-Hiro]

LGTM