TF-233 Add mailbox name validator

lib/features/mailbox_creator/presentation/widgets/app_bar_mailbox_creator_widget.dart

@@ -71,7 +71,7 @@ class AppBarMailboxCreatorWidget {
               AppLocalizations.of(_context).done,
               style: TextStyle(fontSize: 17, color: isValidated ? AppColor.colorTextButton : AppColor.colorDisableMailboxCreateButton),
             ),
-            onPressed: () => _createActionClick?.call()
+            onPressed: () => isValidated ? _createActionClick?.call() : null
         )
     );
   }

lib/features/mailbox_creator/presentation/widgets/create_mailbox_name_input_decoration_builder.dart

@@ -16,6 +16,9 @@ class CreateMailboxNameInputDecorationBuilder extends InputDecorationBuilder {
       errorBorder: errorBorder ?? OutlineInputBorder(
         borderRadius: BorderRadius.all(Radius.circular(10)),
         borderSide: BorderSide(width: 1, color: AppColor.colorInputBorderErrorVerifyName)),
+      focusedErrorBorder: errorBorder ?? OutlineInputBorder(
+          borderRadius: BorderRadius.all(Radius.circular(10)),
+          borderSide: BorderSide(width: 1, color: AppColor.colorInputBorderErrorVerifyName)),
       prefixText: prefixText,
       labelText: labelText,
       floatingLabelBehavior: FloatingLabelBehavior.never,