TF-4274 Fix logic clear cache email in onBeforeUnloadBrowserListener

lib/features/mailbox_dashboard/presentation/controller/mailbox_dashboard_controller.dart

@@ -620,7 +620,7 @@ class MailboxDashBoardController extends ReloadableController
       return;
     }
 
-    if (PlatformInfo.isWeb) {
+    if (event is html.BeforeUnloadEvent) {
       await cachingManager.clearAllEmailAndStateCache();
     }
   }

lib/features/manage_account/presentation/manage_account_dashboard_controller.dart

@@ -139,7 +139,7 @@ class ManageAccountDashBoardController extends ReloadableController
 
   @override
   Future<void> onBeforeUnloadBrowserListener(html.Event event) async {
-    if (PlatformInfo.isWeb) {
+    if (event is html.BeforeUnloadEvent) {
       await cachingManager.clearAllEmailAndStateCache();
     }
   }