feat(css): support preprocessor with lightningcss#19071

Draft

sapphi-red wants to merge 6 commits intovitejs:mainfrom sapphi-red:feat/support-preprocessor-with-transformer-lightning-css

+607-83

Commits on Dec 24, 2024

perf: only run postcss when needed
sapphi-red
committed

Commits on Dec 25, 2024

Commits on Dec 26, 2024