refactor(gallery): extract controls N01-N10 into GW builders

Rocker, transport cluster, preset bank, dual knob, encoder, key switch, crossfader, thumbwheel, DIP bank, and jog wheel move into widgets.js; their inline onclick globals (transport/preset/keyTurn/dip) become listeners inside the builders. Transport takes an explicit animate option so reduced-motion behavior is the consumer's call; its initial paint leaves reel play-state to CSS, matching load behavior. Probes green plus the per-widget behavioral pass (43 checks).

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