scottbez1/smartknob ? reverse-engineered prompt

Build me the SmartKnob project so I can use a physical knob with haptic feedback that feels like it has clickable stops and hard limits. I want the firmware, the simple demo interface, and the basic setup to be working together so I can plug the device in over USB, flash it, and try the timeline style demo in a browser.

Keep it focused on making the existing project easier to run and understand, with clear setup steps, a smooth demo, and sensible defaults for the knob behavior. If you need to, look up current docs online for anything that has changed since the README was written.

Make sure it feels polished enough for someone building the hardware at home, with good error handling and helpful messages when something is missing or not connected.