Add check for document in useCsrfToken hook

This commit introduces a check for the existence of 'document' in 'useCsrfToken' hook. This is to protect against errors when using this hook in a non-browser environment where 'document' is not defined.

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

@@ -3,6 +3,10 @@
  * @returns The CSRF token.
  */
 export function useCsrfToken() {
+  if (typeof document === 'undefined') {
+    return '';
+  }
+
   const meta = document.querySelector('meta[name="csrf-token"]');
 
   if (!meta) {