feat(gallery): add R21 LED program row

The classic program-select idiom after a digital reverb's program bank (reference filed in the catalogue's working directory): eight identical dark keys, numbered, with a red LED dot above each. The LED carries the selection, not the key face — exactly one lit at a time, and the readout names the program. Keys press with the same momentary dip as the entry keypad.

This maps directly onto a workspace selector for the waybar target.

I verified it in headless Chrome: clicking a key moves the single lit LED and renames the readout, no console exceptions.

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