feat(gallery): add R30 telegraph indicator

The engine-telegraph state dial (references filed in the catalogue's working directory — an electric indicator and a ship's engine-order telegraph): a cream pie of labeled sectors with a red pointer and its little flag naming the active state, stepping with a swing on click. The annunciator grid shows states as cells and the rotary selector is input; state-by-pointer-on-sectors was the missing indication form.

I verified it in headless Chrome: clicks step through all six states and wrap, no console exceptions.

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