Storm99999/sphere ? reverse-engineered prompt

Build me a simple desktop macro app with a clean HTML interface and a C# backend.

I want it to let me create a few preset macros, turn them on and off easily, and run them from one executable. Make the UI straightforward, with clear buttons for things like starting, stopping, and switching between presets. It should feel polished and lightweight, and be easy to compile from source or run from a prebuilt release. Include basic setup instructions in the README, and make sure it works without needing anything complicated. If you need to check current docs or examples online for the best way to wire the frontend to the backend, feel free to do that.