fix: guard document/window access in I18n to prevent Node.js crash

getCookie() accesses document.cookie and getUrlParameter() accesses
window.location via ranuts utilities. When Playwright imports
@bybrowser/editor in Node.js (for onlyoffice-new-document.spec.ts),
the module-level `new I18n()` call crashes with
'ReferenceError: document is not defined'. Add typeof guards so both
methods return null safely in SSR/Node.js environments.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: chaxus

packages/editor-v7/src/i18n.ts

@@ -131,13 +131,15 @@ class I18n {
    * Get cookie value by name (using ranuts utility)
    */
   private getCookie(name: string): string | null {
+    if (typeof document === 'undefined') return null;
     return getCookie(name);
   }
 
   /**
    * Get URL parameter by name (using ranuts utility)
    */
   private getUrlParameter(name: string): string | null {
+    if (typeof window === 'undefined') return null;
     return getQuery()?.[name] || null;
   }
 

packages/editor-v9/src/i18n.ts

@@ -131,13 +131,15 @@ class I18n {
    * Get cookie value by name (using ranuts utility)
    */
   private getCookie(name: string): string | null {
+    if (typeof document === 'undefined') return null;
     return getCookie(name);
   }
 
   /**
    * Get URL parameter by name (using ranuts utility)
    */
   private getUrlParameter(name: string): string | null {
+    if (typeof window === 'undefined') return null;
     return getQuery()?.[name] || null;
   }