refactor(gallery): extract controls R27-R29, R32-R34, R37, R38 into GW builders

Winged gain selector, rotary disc switch, guarded toggle, mechanical timer dial, four-way rocker, four-way toggle selector, pin routing matrix, and dead-man button. The timer dial keeps its reduced-motion-gated 1 Hz wind-down inside the builder — it's widget behavior, not a gallery meter loop. discRed moves to the shared defs so the guarded toggle renders standalone. Behavioral pass now 96 checks; both probes green.

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