zuhair-swe/intrview-preparation-app ? reverse-engineered prompt

Build me a full stack interview prep app where people can sign up, log in, and save their progress as they practice technical interview questions.

I want a clean, responsive web app with a dashboard for interview questions and answers, the ability to browse by category, search and filter questions, and a simple way to track how far along a user is with their preparation. Users should be able to create an account, log in securely, update their profile, and only access protected parts of the app after signing in.

Please make both the frontend and backend work together, with a database for users and questions, and secure authentication using tokens. The app should feel practical and easy to use, like something a student or developer could use every day to prepare for interviews. If you need anything unclear, check the current docs online and make sensible choices.