feat(gallery): add R17 round CRT scope

The round-tube scope after a 1950s bench oscilloscope (reference filed in the catalogue's working directory): pale phosphor face in a screwed porthole bezel, dark graticule, and a bright live trace with a soft glow underlay. The kit's rectangular N11 scope is the modern face; this is the pre-60s one, light screen instead of dark.

I verified it in headless Chrome: the trace animates and Vpp tracks the envelope, no console exceptions.

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