Prathik-007/Trip-Split — reverse-engineered prompt

Build me a TripSplit app for groups going on trips together. People should be able to sign up, log in, create a trip, add expenses with a name and amount, and see the trip expenses in a clear way so everyone knows what has been paid.

Use a Node and Express backend with MongoDB, JWT login, password hashing, and protected routes so only logged in users can access their trip data. Also make a Flutter mobile frontend that connects to the backend and lets users register, log in, view trips, create trips, and add expenses.

Keep it simple but usable. If the settlement summary or live updates are too much for the first version, leave the code structured so they can be added later. Add clear setup instructions, environment variable examples, and make sure the app can run locally with the backend on port 5000. Look up current docs online if you need to.