TF-460 Separate the header of MailboxDashboard on the browser

lib/features/base/action/ui_action.dart

@@ -0,0 +1,6 @@
+
+import 'package:equatable/equatable.dart';
+
+abstract class Action with EquatableMixin {}
+
+abstract class UIAction extends Action {}

lib/features/base/mixin/app_loader_mixin.dart

@@ -0,0 +1,13 @@
+
+import 'package:core/core.dart';
+import 'package:flutter/cupertino.dart';
+
+mixin AppLoaderMixin {
+
+  Widget get loadingWidget {
+    return Center(child: SizedBox(
+        width: 24,
+        height: 24,
+        child: CupertinoActivityIndicator(color: AppColor.colorLoading)));
+  }
+}

lib/features/base/mixin/popup_context_menu_action_mixin.dart

@@ -19,8 +19,8 @@ mixin PopupContextMenuActionMixin {
         context: context,
         position: position ?? RelativeRect.fromLTRB(16, 40, 16, 16),
         color: Colors.white,
-        elevation: 5,
-        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(14)),
+        elevation: 4,
+        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
         items: popupMenuItems);
   }