chore: upgrade tailwind css from 3.4 to 4.3

assets/styles/app.css

@@ -1,8 +1,5 @@
-@import "tailwindcss/base";
-@import "_base.css";
-
-@import "tailwindcss/components";
-@import "_components.css";
-
-@import "tailwindcss/utilities";
-@import "_utilities.css";
+@import "tailwindcss" source(none);
+@import "./_theme.css";
+@import "./_base.css" layer(base);
+@import "./_components.css" layer(components);
+@import "./_utilities.css";