spayghan/Mern-Stack ? reverse-engineered prompt

Build me a simple full stack Todo app that I can use to keep track of tasks.

I want a React frontend with a clean, responsive layout and basic navigation, plus a Node and Express backend that talks to MongoDB so tasks are saved for real. The app should let me add a new task, see all my tasks in a list, and delete tasks when I am done with them. Make the frontend and backend communicate through a REST API, and handle the connection cleanly so it works without cross origin issues. Use a simple modern look, and make it easy to use on both desktop and mobile.

If you need to check current setup details or best practices, look up the latest docs online. Please wire everything together so I can run the client and server and have the app working end to end.