Introduced Notification server, and added background thorugh quickshell

common/NotificationService.qml

@@ -0,0 +1,18 @@
+pragma Singleton
+
+import Quickshell
+import Quickshell.Services.Notifications
+
+Singleton {
+  readonly property list<Notification> notifications: server.trackedNotifications.values
+  readonly property int amountNotifications: notifications.length
+
+  NotificationServer {
+    id: server
+    actionsSupported: true
+
+    onNotification: notif => {
+      notif.tracked = true;
+    }
+  }
+}