Add an explicit system-variables-prefix to themes that use system variables
ProprietaryMaterial 19 changed the default prefix of the CSS variables that themes with use-system-variables: true emit. Adds system-variables-prefix: sys to those theme maps so the variables keep their names. This is the system variable prefix migration of the @angular/material 19 ng update.
org.mod run .Install it once, then run it on every repository under the current directory. New to the Moderne CLI? Set it up.