feat(gallery): add the ABC entry keypad

The kit entered digits three ways and text no way at all, so the panels that need a WiFi password had nothing to reach for. R57 takes free alphanumeric text. A-Z is laid out alphabetically rather than QWERTY, the industrial convention wherever the operator isn't assumed to touch-type, and what makes this a faceplate instead of a keyboard.

I followed two reference plates and departed from both, arguing each departure at its site. Their letters are blue and the kit has no blue control colour, so letters take the standard pale cap and digits a darker one: the photos' two-tone grouping without the foreign hue. Letters sit left and digits right so the alphabet reads down one unbroken block. With the digits on the left it stops column-aligning with itself halfway down.

DEL is new, because without a backspace one mistyped character costs the whole entry. It sits beside the digits in amber while CLR is exiled to the corner in red. DEL is constant and costs a character, CLR is rare and costs everything, so the safe key gets the good spot and the colour grades the cost before the legend is read. CANCEL is gone: on a plate that is the whole terminal it has a transaction to abandon, but here it did exactly what CLR does.

The window draws spaces as ␣. SVG collapses whitespace, and past the truncation boundary there are no pad dots left for a space to displace, so SPACE was a keypress with no feedback at all. The buffer keeps the real character.

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