notepat-remote: track color flavors the whole board + URL cache-bust
Resting pads now mix the Live track color into their base palette
(ivory whites at 12%, black-key PAD_SHARP at 22%) so every key
carries a subtle flavor of the hosting track — not just the bezel +
held sharps. Idle backdrop similarly biases toward a deeply-darkened
track color instead of the flat near-black, keeping the track
flavor alive when nothing is playing.
Live URL gets \`&v=<git-commit>\` appended so jweb/service-worker
caches can't keep an older piece pinned between lith deploys.
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