fix: top level selectors

Author: segunadebayo

.changeset/fix-shadow-dom-selectors.md

@@ -0,0 +1,7 @@
+---
+"@chakra-ui/react": patch
+---
+
+Fix Shadow DOM and Web Component selector handling in `globalCss`. The `:host`,
+`:host-context()`, and `::slotted()` pseudo-classes now correctly transform to
+top-level selectors with case-insensitive matching.