feat(gallery): add reference batch R01-R04 modeled on period hardware

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.

1 files changed, 2 insertions, 0 deletions

diff --git a/todo.org b/todo.org
index b94f180..035f0e6 100644
--- a/todo.org
+++ b/todo.org
@@ -21,6 +21,8 @@ The vocabulary is open — topic tags are coined as needed — so these are conv
 - *Effort / autonomy*: =:quick:= a spare-moment fix (minutes, not a sitting); =:solo:= Claude can carry it end to end — there's a build path, a test path, and no upfront decision needed (a leftover manual spot-check doesn't disqualify it).
 - *Topic / area* (open): the subsystem a task touches — e.g. =:hyprland:= =:waybar:= =:mpd:= =:music:= =:network:= =:tooling:= =:llm:= =:eask:= =:pocketbook:= =:cmail:=. Coin a new one when it aids filtering.
 * Archsetup Open Work
+** DOING [#B] Retro widget catalogue :feature:design:
+The panel widget gallery ([[file:docs/prototypes/panel-widget-gallery.html][docs/prototypes/panel-widget-gallery.html]]) grows into a retro-instrument component catalogue: reference photos of period hardware → gallery cards (the visual + behavioral spec) → reusable components for three targets (emacs svg.el, web/React, waybar). Tokens single-sourced in [[file:docs/prototypes/tokens.json][tokens.json]] (gen_tokens.py emits web/waybar/elisp); svg.el proof widget shipped (gallery-widget.el, needle gauge). Reference photos live in [[file:working/retro-stereo-widgets/][working/retro-stereo-widgets/]] (Berna 3 / Sancristoforo faceplates, 2026-07-11 batch). R-series cards are the reference-derived widgets.
 ** TODO [#C] Net panel: Enterprise error never dismisses :bug:dotfiles:network:
 The enterprise-auth error banner in the network panel stays no matter what; selecting another action should clear it (from roam inbox, 2026-07-11). Repro screenshot: =~/pictures/screenshots/2026-07-10_195911.png=. Minor severity × some users, sometimes (only enterprise-network users who hit the error) = P3 = [#C]. Distinct from the net doctor's enterprise auth verdict shipped this session — that's the doctor's terminal message; this is the panel's stuck error banner.
 ** TODO [#C] Notification/capture popup grows too large :bug:hyprland: