4r1n0930/Impression ? reverse-engineered prompt

Build me a simple full stack web app with a frontend and a backend, using the codebase already split into those two parts. I want it to feel like a real usable starter project, with a clean interface on the frontend and basic API handling on the backend, so I can run it locally and see the whole thing working end to end.

Please wire up the pieces so the app has at least one meaningful flow from the UI to the server and back, with sensible placeholder data if needed. Make it easy to start, easy to understand, and polished enough that it looks like an actual product instead of a bare demo. If you need to, look up current docs online for the best way to set things up. Also leave the code organized so it would be easy for me to expand later.