Breathing rendered all LEDs off because wire byte 3 (CE[6]) was
hardcoded 0 — it is the intensity field (Breathing.Params field 3,
value/100). Encode it, expose the intensity slider, and seed a non-zero
default so picking the effect does not send an off frame.
DualColor wire byte 6 is intensity, not "speed" — the firmware-lighting
decode shows no speed/period field for DualColor. Rename throughout.
Custom (effect 5) is a stored card-reference effect, not a parametric
one; it cannot be set via setRGBClusterEffect. Drop it from the picker.
Also seed sane per-effect defaults (the picker rebuilds the effect from
zeroed widgets, so an unseeded pick sends an all-zero frame the firmware
rejects) and clamp the period slider to 1000-20000 ms, matching the
keyboard/mouse RGB effects.
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