GajendraSingh33/BookStore ? reverse-engineered prompt

Build me a full stack bookstore app where people can browse a catalog of books, filter between all books, free books, and paid books, and search books quickly by title, author, category, or name. I want secure signup and login, with the book catalog protected so unauthenticated users get sent to sign up or log in first. After login, take them back to where they were going.

Make it feel polished and modern, with a responsive layout, a sticky navbar, dark mode that follows system settings and saves the choice, toast messages for success and errors, and a nice homepage with a free books carousel. Add a contact form that actually sends email, and make the backend create the database tables and seed sample data automatically on first run so there is no manual setup.

Use React on the frontend, Node and Express on the backend, and PostgreSQL for storage. If you need to check current docs for anything, go ahead and look them up online.