Add support for dynamic callback URL in Google sign-in flow

[Marfuen]

What does this PR do?

• Fixes #XXXX (GitHub issue number)
• Fixes COMP-XXXX (Linear issue number - should be visible at the bottom of the GitHub issue description)

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[Copilot]

Pull Request Overview

This PR adds support for a dynamic callback URL in the Google sign-in flow.

• Dynamically builds the callback URL from the provided redirect path and the current window location.
• Passes the generated URL string to the auth client’s social sign-in method.

[Copilot]

[nitpick] Consider inlining the URL conversion if the variable is only used once (e.g., directly passing new URL(redirectTo, window.location.origin).toString() to authClient.signIn.social), or add a clarifying comment if keeping the variable improves readability.

Suggested change

	const callbackURL = new URL(redirectTo, window.location.origin);
	await authClient.signIn.social({
	provider: "google",
	callbackURL: callbackURL.toString(),
	await authClient.signIn.social({
	provider: "google",
	callbackURL: new URL(redirectTo, window.location.origin).toString(),