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/billing/gateway/src/components/current-subscription-card.tsx

@@ -67,7 +67,7 @@ export function CurrentSubscriptionCard({
 
       <CardContent className={'space-y-4 border-t pt-4 text-sm'}>
         <div className={'flex flex-col space-y-1'}>
-          <div className={'flex items-center space-x-2 text-lg font-semibold'}>
+          <div className={'flex items-center gap-x-3 text-lg font-semibold'}>
             <BadgeCheck
               className={
                 's-6 fill-green-500 text-white dark:fill-white dark:text-black'
@@ -102,7 +102,7 @@ export function CurrentSubscriptionCard({
         </If>
 
         <If condition={subscription.status === 'trialing'}>
-          <div className="flex flex-col space-y-0.5">
+          <div className="flex flex-col gap-y-1">
             <span className="font-semibold">
               <Trans i18nKey="billing:trialEndsOn" />
             </span>
@@ -132,7 +132,7 @@ export function CurrentSubscriptionCard({
           </Alert>
         </If>
 
-        <div className="flex flex-col space-y-0.5">
+        <div className="flex flex-col gap-y-1">
           <span className="font-semibold">
             <Trans i18nKey="billing:detailsLabel" />
           </span>