リダイレクトを行うと遷移履歴がおかしくなるのを修正

[avaice]

…gement

[Copilot]

Pull request overview

This PR fixes an issue where performing a redirect results in an incorrect browser navigation history, by changing redirects to replace the current history entry rather than push a new one.

Changes:

• Update Redirect to call history.replaceState instead of relying on the normal router navigation behavior.
• Bypass useRouter()’s pushState-based navigation by using RouterContext’s internal setLocation directly for redirects.

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