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

configs/quickshell/modules/common/widgets/ButtonGroup.qml

@@ -0,0 +1,46 @@
+import qs.modules.common
+import qs.modules.common.widgets
+import QtQuick
+import QtQuick.Layouts
+
+/**
+ * A container that supports GroupButton children for bounciness.
+ * See https://m3.material.io/components/button-groups/overview
+ */
+Rectangle {
+    id: root
+    default property alias data: rowLayout.data
+    property real spacing: 5
+    property real padding: 0
+    property int clickIndex: rowLayout.clickIndex
+
+    property real contentWidth: {
+        let total = 0;
+        for (let i = 0; i < rowLayout.children.length; ++i) {
+            const child = rowLayout.children[i];
+            if (!child.visible) continue;
+            total += child.baseWidth ?? child.implicitWidth ?? child.width;
+        }
+        return total + rowLayout.spacing * (rowLayout.children.length - 1);
+    }
+
+    topLeftRadius: rowLayout.children.length > 0 ? (rowLayout.children[0].radius + padding) : 
+        Appearance?.rounding?.small
+    bottomLeftRadius: topLeftRadius
+    topRightRadius: rowLayout.children.length > 0 ? (rowLayout.children[rowLayout.children.length - 1].radius + padding) : 
+        Appearance?.rounding?.small
+    bottomRightRadius: topRightRadius
+
+    color: "transparent"
+    width: root.contentWidth + padding * 2
+    implicitHeight: rowLayout.implicitHeight + padding * 2
+    implicitWidth: root.contentWidth + padding * 2
+    
+    children: [RowLayout {
+        id: rowLayout
+        anchors.fill: parent
+        anchors.margins: root.padding
+        spacing: root.spacing
+        property int clickIndex: -1
+    }]
+}