refactor user login:

1. opt request json type.
2. desktop and mobile use same loginDialog.
3. opt loginDialog UI style.
4. opt login request Exception catch.

flutter/lib/common/widgets/address_book.dart

@@ -9,8 +9,6 @@ import '../../desktop/widgets/material_mod_popup_menu.dart' as mod_menu;
 import 'package:get/get.dart';
 
 import '../../common.dart';
-import '../../desktop/pages/desktop_home_page.dart';
-import '../../mobile/pages/settings_page.dart';
 
 class AddressBook extends StatefulWidget {
   final EdgeInsets? menuPadding;
@@ -41,21 +39,12 @@ class _AddressBookState extends State<AddressBook> {
         }
       });
 
-  handleLogin() {
-    // TODO refactor login dialog for desktop and mobile
-    if (isDesktop) {
-      loginDialog();
-    } else {
-      showLogin(gFFI.dialogManager);
-    }
-  }
-
   Future<Widget> buildBody(BuildContext context) async {
     return Obx(() {
       if (gFFI.userModel.userName.value.isEmpty) {
         return Center(
           child: InkWell(
-            onTap: handleLogin,
+            onTap: loginDialog,
             child: Text(
               translate("Login"),
               style: const TextStyle(decoration: TextDecoration.underline),