Module visual_widgets 

Custom visual widgets & DSP-accelerated UI controls for embedded-gui.

Includes:

1. BusyWheel — Activity indicator spinner with orbiting dot trail
2. GaugeWidget — Analog gauge dial helper with value needle
3. TouchInputFilter — DSP Biquad touch & pointer coordinate damping (embedded-dsp integration)
4. SpectrumAnalyzerWidget — Real-time DSP signal & telemetry bar visualizer (embedded-dsp integration)

Structs

BusyWheel

Activity Indicator / Busy Wheel widget.

GaugeWidget

Analog Gauge dial widget.