Tailwind CSS 4 Migration (#100)

* Updated to TailwindCSS v4
* Moved CSS module to its own CSS file because of lightingcss strict validation
* Respect next parameter in middleware
* Updated all packages. 
* Split CSSs for better organization.
* Redesigned theme and auth pages
* Improved pill and header design
* Formatted files using Prettier
* Better footer layout
* Better auth layout
* Bump version of the repository to 2.0.0

packages/ui/src/shadcn/checkbox.tsx

@@ -12,7 +12,7 @@ const Checkbox: React.FC<
 > = ({ className, ...props }) => (
   <CheckboxPrimitive.Root
     className={cn(
-      'peer h-4 w-4 shrink-0 rounded-sm border border-primary shadow focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring disabled:cursor-not-allowed disabled:opacity-50 data-[state=checked]:bg-primary data-[state=checked]:text-primary-foreground',
+      'peer border-primary focus-visible:ring-ring data-[state=checked]:bg-primary data-[state=checked]:text-primary-foreground h-4 w-4 shrink-0 rounded-xs border shadow-xs focus-visible:ring-1 focus-visible:outline-hidden disabled:cursor-not-allowed disabled:opacity-50',
       className,
     )}
     {...props}