fix: add wayland dev headers and scanner for pywayland build on NixOS

configs/quickshell/modules/bar/BarGroup.qml

@@ -0,0 +1,36 @@
+import qs.modules.common
+import QtQuick
+import QtQuick.Layouts
+
+Item {
+    id: root
+    property real padding: 5
+    implicitHeight: Appearance.sizes.baseBarHeight
+    height: Appearance.sizes.barHeight
+    implicitWidth: rowLayout.implicitWidth + padding * 2
+    default property alias items: rowLayout.children
+
+    Rectangle {
+        id: background
+        anchors {
+            fill: parent
+            topMargin: 4
+            bottomMargin: 4
+        }
+        color: Config.options?.bar.borderless ? "transparent" : Appearance.colors.colLayer1
+        radius: Appearance.rounding.small
+    }
+
+    RowLayout {
+        id: rowLayout
+        anchors {
+            verticalCenter: parent.verticalCenter
+            left: parent.left
+            right: parent.right
+            leftMargin: root.padding
+            rightMargin: root.padding
+        }
+        spacing: 4
+
+    }
+}