Unknown theme token

A var(--token) names no token in the active theme.

#Common causes

• A typo in the token name.
• A token that exists in only one theme.

#Fixes

• Use a token defined in both assets/themes/ara-dark.json and ara-light.json, or add it to both.

• Code: ARA4012

• Constant: ui::TOKEN

• Reported by: ara-ui