fix: preserve login method across session windows

flutter/lib/common/widgets/toolbar.dart

@@ -579,7 +579,9 @@ List<TTextMenu> toolbarControls(BuildContext context, String id, FFI ffi) {
       bool isTerminal = false}) {
     final connToken = bind.sessionGetConnToken(sessionId: ffi.sessionId);
     connect(context, id,
-        loginMethod: ffi.loginMethod,
+        loginMethod: bind.sessionGetCommonSync(
+                sessionId: ffi.sessionId, key: 'login_method', param: '') ??
+            '',
         isFileTransfer: isFileTransfer,
         isViewCamera: isViewCamera,
         isTerminal: isTerminal,

flutter/lib/models/model.dart

@@ -4032,7 +4032,6 @@ class FFI {
   var id = '';
   var version = '';
   var connType = ConnType.defaultConn;
-  var loginMethod = '';
   var closed = false;
 
   /// dialogManager use late to ensure init after main page binding [globalKey]
@@ -4127,7 +4126,6 @@ class FFI {
     List<int>? displays,
     String loginMethod = '',
   }) {
-    this.loginMethod = loginMethod;
     closed = false;
     if (isMobile) mobileReset();
     assert(

flutter/lib/web/bridge.dart

@@ -1966,6 +1966,9 @@ class RustdeskImpl {
       required String key,
       required String param,
       dynamic hint}) {
+    if (key == 'login_method') {
+      return js.context.callMethod('getByName', ['login_method']);
+    }
     throw UnimplementedError("sessionGetCommonSync");
   }