TF-2928 Show confirm dialog & handle exception when reload browser or loss of connection

core/lib/domain/exceptions/platform_exception.dart

@@ -0,0 +1,14 @@
+import 'package:equatable/equatable.dart';
+
+class PlatformException with EquatableMixin implements Exception {
+  final String message;
+
+  PlatformException(this.message);
+
+  @override
+  List<Object> get props => [message];
+}
+
+class NoSupportPlatformException extends PlatformException {
+  NoSupportPlatformException() : super('This platform is not supported');
+}