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I built four widgets as inline SVG (the substrate that ports to svg.el), modeled on 1950s-60s lab and console hardware from the reference photos now filed in the catalogue's working directory:
- R01 moving-coil VU meter: cream face, authentic nonlinear dB arc (-20 to +3), red zone, ballistic needle on the live signal.
- R02 calibrated vernier dial: rotating tick-ring disc with radial numerals under a fixed hairline, fluted bakelite knob, reads to a tenth.
- R03 bat-handle toggle: chrome lever on a hex bushing, snaps ON/OFF with lit legends.
- R04 bakelite fluted knob: scalloped skirt, glossy dome, amber index over a printed 0-10 scale.
I verified all four in headless Chrome: the VU animates with ballistics, the dial and knob track drags, the toggle throws, no console exceptions. The gallery now carries 57 cards.
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A spike disproved the CSS / state-file approach. GTK3 has no display:none, so native modules go invisible but hold their space, and the bar never reflows. The mechanism is config-swap plus a SIGUSR2 reload, driven through an active config copied into XDG_RUNTIME_DIR so the toggle never rewrites the stowed canonical config.
The spec locks the base sets (left: menu + workspaces; right: date + worldclock + tray), keeps the two sides independent, and stays host-agnostic: the base set is constant, the full set is whatever each host already defines. Spec and spike findings live under working/.
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