Improved Routing to /copilots

We've optimized the redirection from /copilots to /copilots/default/chats/new by moving logic to middleware.ts. This change prevents rendering issues and significantly speeds up the redirection process, providing a smoother navigation experience.

These release notes were orchestrated by ReleaseNotes Rockstar, built by Fuel iX Copilots - because every great update deserves a standing ovation! 🎸