RGB headsets (e.g. G522) expose HEADSET_RGB_ONBOARD_EFFECTS (0x0621) —
a firmware-played RGB effect on the headset's primary lighting cluster,
chosen from six effect types: Fixed, Color Cycle, Color Wave,
Breathing, Dual Color, Custom.
Add an effect-switching HETERO setting modeled on the keyboard zone
effects: a six-way effect picker plus the per-effect parameter widgets
(colours, intensity, period, saturation, direction), with fields_map
showing only the fields the selected effect uses. The rw_class reads
getRGBClusterEffect and writes setRGBClusterEffect; the data class
encodes each effect's distinct parameter layout.
build() reads getRGBClusterInfo to learn the cluster's supported-effect
set and offers only those in the picker; an unparseable reply falls
back to offering all six (the firmware rejects any it doesn't support).
intensity is a 0-100 percent; saturation is a raw 0-255 byte, matching
the keyboard RGB effects. Like the signature/boot effects this runs
autonomously on the firmware and is not gated on host LED control.
Cluster 0 only — no multi-cluster headset has been seen and the
getInfo multi-cluster descriptor stride is unconfirmed.
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