Add a comment explaining why user settings may be undefined

GitOrigin-RevId: 4460d4184cde5639d326da07121b2728d444c782

services/web/frontend/js/features/editor-left-menu/hooks/use-user-wide-settings.tsx

@@ -11,6 +11,8 @@ import type { UserSettingsScope } from '../utils/api'
 
 export default function useUserWideSettings() {
   const saveUserSettings = useSaveUserSettings()
+
+  // this may be undefined on test environments
   const [userSettings] = useScopeValue<UserSettingsScope | undefined>('settings', true)
 
   const setOverallTheme = useSetOverallTheme()