akorb/SteamShutdown ? reverse-engineered prompt

Build me a small Windows app that lives in the taskbar and automatically shuts down the PC when Steam has finished downloading everything.

I want it to use Steam’s own files or status data to tell when downloads are really done, not hacks like watching disk or network usage. It should run quietly with no main window, just a tray icon with a simple menu when I click it. It should start up normally without needing administrator rights, and if it does need anything extra, make it clear in the app.

Please make it reliable and easy to understand, with a clean little UI for the tray menu and basic settings or controls if needed, like turning shutdown on or off. If there are edge cases, like Steam closing or no active downloads, handle them sensibly. Look up current docs online if you need to.