Smoother free-trial signup flow

Rebuilt the confirm-your-email page so it lives inside the same hero shell as the signup form, globe still spinning, brand consistent end-to-end. Added a one-click resend button that uses the existing token (rate-limited to once per minute per address). When you click the verification link in your inbox, the original signup tab now follows you to the dashboard automatically, so you do not end up with two tabs to close.