Added a clear all notifications button and an AGENTS.md file for llms to

test their effectiveness

common/NotificationService.qml

@@ -7,6 +7,12 @@ Singleton {
   readonly property list<Notification> notifications: server.trackedNotifications.values
   readonly property int amountNotifications: notifications.length
 
+  function dismissAll() {
+    for (let i = notifications.length - 1; i >= 0; i--) {
+      notifications[i].dismiss();
+    }
+  }
+
   NotificationServer {
     id: server
     actionsSupported: true