Why: Phase 1 of the approved frontend redesign: re-skin the shell to the
Zai look (floating rounded panels on an inset base with 4px gutters),
invert primary buttons to the mono scheme, and move every font size onto
the --fs-ui-* scale. Also wires @ui/motion.css and replaces local
keyframes with mk-* utilities.
Evidence: npx tsc -b clean; npm test -> 38 passed (new host-side
design-guard ratchet); npm run build succeeds. Combined Dev make test
recorded in the Dev task card.
Impact: styles.css fully re-tokenized (panel borders/radius, primary
button color-mix hover, login brand panel in near-mono navy); inline
fontSize literals in components replaced with scale tokens except one
decorative glyph in the ratchet baseline. No component class names or
behavior changed.
Refs: Agent-System-Dev task feature/ui-tokens-v3; DESIGN.md (parent repo).
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