lmajowka/btc-finder ? reverse-engineered prompt

Build me a simple educational JavaScript app that shows a playful way to “find bitcoins,” with a small web interface and a clear start screen. It should feel like a fun demo, not a real mining tool, and it should be easy to run locally with npm start or in a Docker container.

I want the app to let a user start the process, watch it search, and see when it finds something, with obvious status messages and a simple results area. Keep the interface clean and easy to understand, since this is for learning and experimenting. If you need current setup details or library docs, look them up online.

Please make sure the project runs smoothly from the command line, and that the web page opens on a local port so I can test it in the browser.