Auth_system

* The authentication core expertly utilizes TypeScript module augmentation, ensuring robust type safety across Auth.js sessions and JWT payload structures. * Validation logic is securely handled using Zod, implementing complex schema refinement for conditional requirements like password updates. * The architecture clearly separates NextAuth provider configuration from runtime callback logic, promoting excellent maintainability and feature scaling. * Advanced security features, including conditional two-factor authentication confirmation deletion and automatic OAuth email verification, are implemented correctly. * The use of `clsx` and `tailwind-merge` confirms a professional, scalable approach to managing component styling within the ShadCN/Tailwind ecosystem. * Database interaction functions are effectively externalized, demonstrating a clear separation between business logic and data access concerns (e.g., `getUserByEmail`).