refactor(gallery): extract controls R16, R18-R24 into GW builders

Entry keypad, thumb-slide pair, waveform region editor, drum roller, LED program row, three-position slide, spun knob, and stomp switch. The drum roller's per-instance clip paths get a uid() helper so two instances can coexist; the region editor's screen-family chips now reach the widget through the card handle (card.gw.el) instead of a stage id, and probe-fams drives its post-recolor check through the handle's set(). Behavioral pass now 78 checks; both probes green.

0 files changed, 0 insertions, 0 deletions