theeddiestudio/todo-app-MERN ? reverse-engineered prompt

Build me a simple full stack todo app where I can add, edit, complete, and delete tasks.

I want a clean frontend for viewing my todos and a backend that stores them so the list stays saved when I refresh the page. Make it easy to mark items as done, see completed and unfinished tasks clearly, and maybe filter between all, active, and completed. Keep the UI simple and modern, nothing fancy.

Use whatever setup makes sense for a MERN style app, and wire the frontend and backend together properly. If you need to look up current docs online for anything, go ahead. Please make sure it runs smoothly in development, with clear instructions for starting both sides. If there are any obvious bugs or missing pieces in the repo, fix those too so I end up with a working todo app I can actually use.