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

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

@@ -0,0 +1,25 @@
+import qs.modules.common
+import QtQuick
+
+/**
+ * Recreation of GTK revealer. Expects one single child.
+ */
+Item {
+    id: root
+    property bool reveal
+    property bool vertical: false
+    clip: true
+
+    implicitWidth: (reveal || vertical) ? childrenRect.width : 0
+    implicitHeight: (reveal || !vertical) ? childrenRect.height : 0
+    visible: reveal || (width > 0 && height > 0)
+
+    Behavior on implicitWidth {
+        enabled: !vertical
+        animation: Appearance.animation.elementMoveEnter.numberAnimation.createObject(this)
+    }
+    Behavior on implicitHeight {
+        enabled: vertical
+        animation: Appearance.animation.elementMoveEnter.numberAnimation.createObject(this)
+    }
+}