🔐 Streamlined Checkout Login

We’ve simplified the login and sign-up experience during checkout to make booking a course faster and more intuitive. First-time customers no longer need to create a password while booking - instead, they can complete their booking without interruption and optionally set a password later from their account. Returning customers will still see a clear and familiar login flow, with improved guidance and fewer distractions. We’ve also fixed an issue where phone numbers were incorrectly prefilled with a country code.