fix: few ui actions not working right after login

[gchust]

Fix the issue https://github.com/vercel/ai-chatbot/issues/300

Default Response.redirect after login is a 302 redirect. And it will block logout and Clear history operation right after login

After changing to 307 redirect, this is working correctly now, and we can logout successfully.

Reference: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/302 and

https://nextjs.org/docs/pages/api-reference/next-config-js/redirects#header-cookie-and-query-matching

Why does Next.js use 307 and 308? Traditionally a 302 was used for a temporary redirect, and a 301 for a permanent redirect, but many browsers changed the request method of the redirect to GET, regardless of the original method. For example, if the browser made a request to POST /v1/users which returned status code 302 with location /v2/users, the subsequent request might be GET /v2/users instead of the expected POST /v2/users. Next.js uses the 307 temporary redirect, and 308 permanent redirect status codes to explicitly preserve the request method used.

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