CSS if syntax dart-sass compatibility

Since https://github.com/sass/dart-sass/releases/tag/1.95.0 the native if-syntax is supported and throws deprecation warnings

Deprecation Warning [if-function]: The Sass if() syntax is deprecated in favor of the modern CSS syntax.

Suggestion: if(sass($important): !important)

More info: https://sass-lang.com/d/if-function

╷
73 │ color: map.get($colors, "text") if($important, !important, null);
│ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
╵
../../../@catppuccin/highlightjs/sass/_theme.scss 73:39 @use

Can be fixed like this https://sass-lang.com/d/if-function

Though this is a breaking change since it is not compatible with older dart-sass versions I think

Start with sass/_theme.scss at line 73 and reproduce the Dart Sass deprecation warning using the current theme. Update the conditional syntax as appropriate, then verify the warning is gone and check compatibility with the older Dart Sass versions mentioned in the issue.

Written by the indexing model from the issue text.