chore: upgrade tailwind css from 3.4 to 4.3

assets/styles/admin.css

@@ -1,7 +1,4 @@
-@import "tailwindcss/base";
-@import "_base.css";
-
-@import "tailwindcss/components";
-@import "_components_admin.css";
-
-@import "tailwindcss/utilities";
+@import "tailwindcss" source(none);
+@import "./_theme.css";
+@import "./_base.css" layer(base);
+@import "./_components_admin.css" layer(components);