C1: product.pricelist._compute_display_name override gated by the
'fp_express_currency_picker' context flag (set on the Express form's
pricelist_id field). When active, prefixes the dropdown label with
the currency code: 'CAD — Public Pricelist (CAD)'. Elsewhere the
standard display name is unchanged.
C3: SCSS tokens + base styles for the Express form. Tokens use the
compile-time @if $o-webclient-color-scheme branch per the project's
'Dark Mode' rule — same SCSS compiles into both bundles with different
hex values. Token vars wrapped in CSS custom properties so downstream
modules can override for per-shop branding without recompiling.
Base styles: spreadsheet-feel table borders, bake-cell inset-pill,
customer line ref bold/uppercase, accent section markers.
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