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/scroll-area.tsx

@@ -33,9 +33,9 @@ const ScrollBar = React.forwardRef<
     className={cn(
       "flex touch-none select-none transition-colors",
       orientation === "vertical" &&
-        "h-full w-2.5 border-l border-l-transparent p-[1px]",
+        "h-full w-2.5 border-l border-l-transparent p-px",
       orientation === "horizontal" &&
-        "h-2.5 flex-col border-t border-t-transparent p-[1px]",
+        "h-2.5 flex-col border-t border-t-transparent p-px",
       className
     )}
     {...props}