feat(gallery): add R28 rotary disc switch

The heavy master-power selector after a marine battery switch (reference filed in the catalogue's working directory): the whole red disc turns with a molded grip bar and a cream index notch, stepping OFF, ON, COMBINE with the active legend lit. A disc that is itself the handle was the one heavy-switch form the kit lacked.

I verified it in headless Chrome: clicks cycle all three positions and wrap, the disc rotates with its settle transition, no console exceptions.

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