faustoandreabellucci/QUICKSKETCH ? reverse-engineered prompt

Build me a simple full stack web app called QuickSketch, something people can open and start drawing in right away without any setup or learning curve. I want a clean page with a sketch canvas and a few basic controls like color, brush size, erase, clear, and a way to save or export what was drawn. If it makes sense, let people create a new sketch and reload a saved one later through the backend, but keep it lightweight and practical.

Use the existing split between frontend and backend, with the backend in Java, and make sure the whole project runs easily with docker compose so someone can get it up locally in one go. Keep the interface simple and fast, more like a quick notes or doodle tool than a complicated design app.

There is not much project documentation here, so make sensible product choices and look up current docs online if you need to.