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

packages/shared/src/env/index.ts

@@ -0,0 +1 @@
+export { env } from 'next-runtime-env';

packages/shared/src/hooks/index.ts

@@ -1 +0,0 @@
-export * from './use-csrf-token';

packages/shared/src/hooks/use-csrf-token.ts

@@ -1,17 +0,0 @@
-/**
- * Get the CSRF token from the meta tag.
- * @returns The CSRF token.
- */
-export function useCsrfToken() {
-  if (typeof document === 'undefined') {
-    return '';
-  }
-
-  const meta = document.querySelector('meta[name="csrf-token"]');
-
-  if (!meta) {
-    return '';
-  }
-
-  return meta.getAttribute('content') ?? '';
-}