feat(gallery): add R27 winged gain selector

The red T-bar gain switch after a classic mic-preamp: a bar-grip handle with a cream index over a dot ring, snapping between labeled dB detents from -80 to +10. This completes the kit's handle-form taxonomy — round, skirted, lever, spun, and knurled-with-spade were built; the bar grip was the missing form.

I verified it in headless Chrome: drags snap between detents in both directions and the readout follows, no console exceptions.

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