Phase 4: admin components and utilities now reference --t-* theme
tokens directly. Status colour tokens added to theme-semantic.css.
Bridge file (admin/themes.css) deleted.
Phase 5: removed duplicated .preview-frame CSS block (~160 lines).
Admin components and icons wrapped in @layer admin. Layer order
updated in admin_root to include admin layer.
Phase 6: added prefers-reduced-motion support (zeroes all durations
and disables animations). Migrated physical properties to logical
equivalents (text-align start/end, margin-inline, padding-inline,
inset-inline-end) across shop and admin CSS.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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