Rework headset RGB lighting so it mirrors the keyboard/mouse model
instead of its own ad-hoc shape.
LED Control (0x0620 HostMode) becomes a boolean toggle: whether Solaar
holds the headset's live-coloring claim. Off releases the LEDs so
another app (e.g. OpenRGB) can drive them; on lets Solaar drive.
0x0620 per-zone painting and the 0x0621 onboard effect are both live
LED control, so both are gated on the claim — UI rows grey out and
wire writes are skipped (value still persisted) when the claim isn't
held, mirroring the keyboard's RGBEffectSetting under rgb_control.
0x0621 HeadsetOnboardEffect is now the primary lighting setting, the
headset analog of keyboard 0x8071 zone effects. Its build reads the
cluster's supported-effect set so the picker offers only those; effect
id 0 is labelled "Static" to match every other Solaar device. The
redundant HeadsetLEDsPrimary (0x0620 single-colour host push) is
removed — that job is exactly the 0x0621 Static effect.
HeadsetPerZoneLighting is the per-key-style overlay: gated on the
claim AND the onboard effect being Static, since per-zone painting
overlays a Static cluster effect (the analog of keyboard per-key
needing rgb_control + zone Static).
The 0x0622 signature effects (startup/shutdown/passive colours) are
the only stored settings here and stay ungated — editable whether or
not Solaar holds the claim.
On re-claim HeadsetLEDControl.write reasserts the dominant layer:
per-zone painting when the onboard effect is Static, else the 0x0621
effect itself.
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