kando-menu/kando ? reverse-engineered prompt

Build me a cross platform desktop app that shows a fast pie menu when I press a hotkey, with an example menu opening on Ctrl Space by default. I want it to feel smooth and simple, and let me trigger common actions like launching apps, sending keyboard shortcuts, and opening files from radial menus.

It should work on Windows, macOS, and Linux, and be usable with mouse, stylus, touch, controller, or just the keyboard. Please include a basic way to create and edit my own menus, and make the app feel polished enough to ship, with a nice first run experience and clear settings.

If you need to check anything in the latest docs or platform behavior, look it up online. Keep the implementation clean and practical, and make sure the default demo menu helps me understand how the app works right away.