🐞 Static extraction misses generating variables and related classes

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Description

When using Static Extraction,
classes like $something:$(custom-color) won't be generated, and variables defined in settings that are only used by this type of syntax won't be generated either.

Reproduction

1. create a static extraction project

npm create @master/css@rc project --example vite-with-static-extraction
cd project

2. set master.config.ts

...
styles: {
    test: '$test:$(test-color)'
},
variables: {
    'test-color': 'rgb(0 1 2)'
}
...

3. build and check output css
   $test:$(test-color) and test-color will not appear in the output CSS.

System Informations

No response