chore: update Tailwind CSS from 3.4.15, to 4.1.11

- Changed the PostCSS configuration to use '@tailwindcss/postcss' instead of 'tailwindcss'.
- Deleted the Tailwind configuration file as it is no longer needed.

components/ui/alert-dialog.tsx

@@ -117,7 +117,7 @@ const AlertDialogCancel = React.forwardRef<
   <AlertDialogPrimitive.Cancel
     ref={ref}
     className={cn(
-      buttonVariants({ variant: "outline" }),
+      buttonVariants({ variant: "outline-solid" }),
       "mt-2 sm:mt-0",
       className
     )}