fix safari-oidc rustdesk#14861 (rustdesk#14867)

Author: rustdesk

flutter/lib/web/bridge.dart

@@ -1538,10 +1538,13 @@ class RustdeskImpl {
 
   Future<void> mainAccountAuth(
       {required String op, required bool rememberMe, dynamic hint}) {
-    return Future(() => js.context.callMethod('setByName', [
+    // Safari only allows auth popups while handling the original user gesture.
+    // Call into JS synchronously so the web OIDC flow can pre-open the window.
+    js.context.callMethod('setByName', [
           'account_auth',
           jsonEncode({'op': op, 'remember': rememberMe})
-        ]));
+        ]);
+    return Future.value();
   }
 
   Future<void> mainAccountAuthCancel({dynamic hint}) {