Next.js Supabase V3 (#463)

Version 3 of the kit:
- Radix UI replaced with Base UI (using the Shadcn UI patterns)
- next-intl replaces react-i18next
- enhanceAction deprecated; usage moved to next-safe-action
- main layout now wrapped with [locale] path segment
- Teams only mode
- Layout updates
- Zod v4
- Next.js 16.2
- Typescript 6
- All other dependencies updated
- Removed deprecated Edge CSRF
- Dynamic Github Action runner

apps/web/app/[locale]/not-found.tsx

@@ -0,0 +1,26 @@
+import { getTranslations } from 'next-intl/server';
+
+import { ErrorPageContent } from '~/components/error-page-content';
+
+export const generateMetadata = async () => {
+  const t = await getTranslations('common');
+  const title = t('notFound');
+
+  return {
+    title,
+  };
+};
+
+const NotFoundPage = async () => {
+  return (
+    <div className={'flex h-screen flex-1 flex-col'}>
+      <ErrorPageContent
+        statusCode={'common.pageNotFoundHeading'}
+        heading={'common.pageNotFound'}
+        subtitle={'common.pageNotFoundSubHeading'}
+      />
+    </div>
+  );
+};
+
+export default NotFoundPage;