feat(gallery): gallery upgrades — size/palette/screen-chips/spec-sheets, 25 new cards, grammar note

Squash of the gallery-upgrades branch (25 commits). Usability: widget stages scale S/M/L (2.4x default), reading text at 12-13pt, a live palette section parsed from the generated :root block, screen-color families with per-card chips on the five screen widgets, and a collapsible spec sheet on every card (input model, solves, use, limits, origin, difficulty, prefer-when, period on the non-timeless).

Collection grew 84 → 109 cards, all CDP-verified: reference cards R32-R36 (mechanical timer, four-way rocker, four-way toggle, day-date discs, LED dot matrix), the takuzu-survey build R37-R47 plus the N23 alarm lifecycle (pin matrix, dead-man, rotary dial, breaker panel, DSKY, cam timer, attitude indicator, heading bug, flip-disc, dekatron, landing gear), the promoted banked six R48-R53 (knife switch, decade box, two-hand control, voice-loop keyset, blinkenlights, circular chart), and the Ki-57/comfort-meter trio R54-R56 (vertical tape, twin-needle, comfort-zone crossed needles).

Also: docs/design control-grammars reference note (taxonomy sources and proposed axes for the classification work), nine reference photos filed, and a component cleanup pass (dial digits above the finger wheel, legible demo defaults, unified captions).

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