feat(gallery): add R18 thumb-slide attenuator pair

Two narrow rail channels after a compressor's blend/mix pair (reference filed in the catalogue's working directory): a lit amber numeral column (100 down to 0) inside each screwed rail, a cream thumb tab riding the rail's edge, and the numeral nearest the value lighting bright. The channels drag independently and the readout carries both.

This differs from the R12 slot fader on both counts that matter: the scale is a lit column inside the channel rather than engraved beside it, and the control is a side tab rather than a T-handle.

I verified both channels in headless Chrome: independent drags move each tab and relight the nearest figure, no console exceptions.

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