remove hack and don't hardcode font

app/qml/main.qml

@@ -35,8 +35,15 @@ Kirigami.ApplicationWindow
         modal: !root.wideScreen
         handleVisible: !root.wideScreen
 
-        topContent: RowLayout {
-            width: parent.width
+        header: Kirigami.AbstractApplicationHeader {
+            topPadding: Kirigami.Units.smallSpacing
+            bottomPadding: Kirigami.Units.smallSpacing
+            leftPadding: Kirigami.Units.smallSpacing
+            rightPadding: Kirigami.Units.smallSpacing
+            contentItem: RowLayout {
+                anchors.fill: parent
+                spacing: Kirigami.Units.smallSpacing
+
                 DBusProperty {
                     id: announcedNameProperty
                     object: DaemonDbusInterface
@@ -48,7 +55,6 @@ Kirigami.ApplicationWindow
                     id: nameField
                     visible: false
                     Layout.fillWidth: true
-                Layout.leftMargin: Kirigami.Units.smallSpacing
                     text: announcedNameProperty.value
                     onAccepted: {
                         DaemonDbusInterface.setAnnouncedName(text)
@@ -56,13 +62,12 @@ Kirigami.ApplicationWindow
                     }
                 }
 
-            Label {
+                Kirigami.Heading {
+                    level: 1
                     text: announcedNameProperty.value
-                visible: !nameField.visible
                     Layout.fillWidth: true
+                    visible: !nameField.visible
                     elide: Qt.ElideRight
-                font.pointSize: 18
-                Layout.leftMargin: Kirigami.Units.smallSpacing
                 }
 
                 Button {
@@ -73,6 +78,12 @@ Kirigami.ApplicationWindow
                     }
                 }
             }
+        }
+
+
+        topContent: RowLayout {
+            width: parent.width
+        }
 
         property var objects: [findDevicesAction]
         Instantiator {