refactor: Update Header component to use resolvedTheme instead of theme

[ttizze]

Summary by CodeRabbit

## リリースノート

### Refactor
- `Header`コンポーネント内で、テーマの取得方法を`theme`から`resolvedTheme`に変更しました。これにより、画像のソースが`/title-logo-${resolvedTheme || "light"}.png`に更新されました。

[github-actions]

CodeRabbit

## ウォークスルー
全体の変更は、`Header`コンポーネント内でテーマを取得するフックの使用方法を更新し、画像ソースの動的な決定に影響を与えるものです。

## 変更点

| ファイル | 要約 |
| --- | --- |
| web/app/components/Header.tsx | `useTheme`フックから取得するテーマを`theme`から`resolvedTheme`に変更し、画像ソースを`/title-logo-${resolvedTheme || "light"}.png`に更新。 |

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[github-actions]

CodeRabbit

Commits

Files that changed from the base of the PR and between 4d09963 and 36dd28d commits.

Files selected (1)

• web/app/components/Header.tsx (1)

Review comments generated (2)

• Review: 1
• LGTM: 1

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[github-actions]

CodeRabbit

スペースが余分に含まれています。修正してください。

- 						src={`/title-logo-${resolvedTheme || "light"}.png `}
+ 						src={`/title-logo-${resolvedTheme || "light"}.png`}