Red-Eric/ChessHv3 ? reverse-engineered prompt

Build me a Chrome extension for chess that helps me while I’m playing online.

I want a simple popup where I can turn the tool on and off, and the extension should work without any backend, just in the browser. It should be able to look at the current chess board on the page, give some kind of helpful move suggestion, and show alerts or small messages when needed. If there are any built in helper files or icons, wire them up so the extension feels finished and usable.

Make it work cleanly with a normal browser extension flow, using the popup, background, and content script pieces as needed. If you need to check current browser extension docs or chess site behavior, go ahead and look them up online first.