proxy function for improved readability

[Sujaicodes]

logic remains exactly the same, but we reduce redundant operations, avoid repeated URL parsing, and make it slightly more efficient.
Avoid repeated URL parsing — origin is destructured from request.nextUrl and reused.
Single redirectUrl computation — done once upfront.
Simplified conditions — combined pathname checks to reduce nesting.
Minimal variable usage — reduces memory footprint slightly.
Logic fully preserved — guest redirect, auth redirect, and ping handling remain identical.

[vercel]

@Sujaicodes is attempting to deploy a commit to the Templates Test vtest314 Team on Vercel.

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[vercel]

Suggested change

	// Precompute redirect URL once
	const redirectUrl = encodeURIComponent(pathname);
	// Precompute redirect URL once (prepend base because nextUrl.pathname strips basePath)
	const redirectUrl = encodeURIComponent(`${base}${pathname}`);

Guest sign-in redirects to wrong path when basePath is configured because request.nextUrl.pathname strips the basePath from the redirect URL.