fix(tools): correct strip unused theming base content #12133
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Previously, the regex approach did not correctly handle CSS variables related to fonts, causing it to match everything following the
--sapFont
variables. This resulted in some CSS variables being missed.Now, PostCSS is used to remove unused theming base content. This is achieved by leveraging the PostCSS AST to traverse all rules within
parameters-bundle.css
files and process their declarations.