[material-nextjs][system] Backport CSS layers to v6#46283

Merged

siriwatknp merged 5 commits intomui:v6.xfrom

siriwatknp:feat/nextjs-pages-csslayers-v6

Jun 24, 2025

Commits on Jun 6, 2025

[material-nextjs] Add option to enable CSS layers for pages router
siriwatknp
committed
[docs] Add cascade layers documentation for Next.js pages router
siriwatknp
committed

Commits on Jun 12, 2025

[system] Add `modularCssLayers` theme flag to split styles into multiple CSS layers (#46001)

siriwatknp
and
claude
committed
cherry pick from #46276
siriwatknp
committed

Commits on Jun 13, 2025

[material-ui] Skip generating `modularCssLayers` CSS var (#46329)
siriwatknp
committed