add: file transfer multi tab support

Signed-off-by: Kingtous <kingtous@qq.com>

flutter/lib/desktop/screen/desktop_file_transfer_screen.dart

@@ -0,0 +1,46 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_hbb/common.dart';
+import 'package:flutter_hbb/desktop/pages/file_manager_tab_page.dart';
+import 'package:flutter_smart_dialog/flutter_smart_dialog.dart';
+import 'package:provider/provider.dart';
+
+/// multi-tab file transfer remote screen
+class DesktopFileTransferScreen extends StatelessWidget {
+  final Map<String, dynamic> params;
+
+  const DesktopFileTransferScreen({Key? key, required this.params})
+      : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return MultiProvider(
+      providers: [
+        ChangeNotifierProvider.value(value: gFFI.ffiModel),
+        ChangeNotifierProvider.value(value: gFFI.imageModel),
+        ChangeNotifierProvider.value(value: gFFI.cursorModel),
+        ChangeNotifierProvider.value(value: gFFI.canvasModel),
+      ],
+      child: MaterialApp(
+          navigatorKey: globalKey,
+          debugShowCheckedModeBanner: false,
+          title: 'RustDesk - File Transfer',
+          theme: ThemeData(
+            primarySwatch: Colors.blue,
+            visualDensity: VisualDensity.adaptivePlatformDensity,
+          ),
+          home: FileManagerTabPage(
+            params: params,
+          ),
+          navigatorObservers: [
+            // FirebaseAnalyticsObserver(analytics: analytics),
+            FlutterSmartDialog.observer
+          ],
+          builder: FlutterSmartDialog.init(
+              builder: isAndroid
+                  ? (_, child) => AccessibilityListener(
+                        child: child,
+                      )
+                  : null)),
+    );
+  }
+}