refactor: common message dialog method

ui/flutter/lib/util/message.dart

@@ -0,0 +1,20 @@
+import 'package:get/get.dart';
+
+import '../api/model/result.dart';
+
+void showErrorMessage(msg) {
+  final title = 'error'.tr;
+  if (msg is Result) {
+    Get.snackbar(title, msg.msg!);
+    return;
+  }
+  if (msg is Exception && (msg as dynamic).message is Result) {
+    Get.snackbar(title, ((msg as dynamic).message as Result).msg!);
+    return;
+  }
+  Get.snackbar(title, msg);
+}
+
+void showMessage(title, msg) {
+  Get.snackbar(title, msg);
+}