sushant1811/Mern-stack- ? reverse-engineered prompt

Build me a simple MERN stack app called LocalLync with a clean, modern UI and a working backend.

I want users to be able to sign up, log in, and then use the app to create and view posts or updates in a shared feed. Make it feel like a local community app, something easy to use and polished on both desktop and mobile.

Please set up the full project so the frontend and backend work together, use sensible defaults, and include basic forms, navigation, and a nice dashboard after login. If you need current docs or best practices for anything, look them up online first.

Keep the scope practical and get it working end to end, so I can run it locally and actually use it right away.