add notifications

include/app.hpp

@@ -4,6 +4,7 @@
 
 #include "bar/bar.hpp"
 #include "services/hyprland.hpp"
+#include "services/notification.hpp"
 
 #include "glibmm/refptr.h"
 #include "gtkmm/application.h"
@@ -17,8 +18,9 @@ class App {
   private:
     Glib::RefPtr<Gtk::Application> app;
     std::vector<std::shared_ptr<Bar>> bars;
+    std::shared_ptr<NotificationService> notificationService = nullptr;
     HyprlandService *hyprlandService = nullptr;
-    TrayService *trayService = TrayService::getInstance();
 
+    TrayService *trayService = TrayService::getInstance();
     void setupServices();
 };