[Woo POS][Design System] Card background color. Cart item price color

[kidinov]

WooPOSCard backgorund color by default should be surfaceContainerLowest
Color of the price in the cart should be onsurfaceVariantHighest

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[dangermattic]

🚫 Please add a type label (e.g. type: enhancement) and a feature label (e.g. feature: stats) to this issue.