add shadows to bar modules

modules/bar/Pw.qml

@@ -1,13 +1,25 @@
+pragma ComponentBehavior: Bound
 import Quickshell.Services.Pipewire
 import Quickshell.Io
 import QtQuick
 import QtQuick.Layouts
+import QtQuick.Effects
 import qs
 import qs.widgets
 import qs.settings
 
 Rectangle {
     id: root
+    layer.enabled: true
+    layer.effect: MultiEffect {
+        id: dropShadow
+        source: root
+        shadowEnabled: true
+        shadowHorizontalOffset: 4
+        shadowVerticalOffset: 2
+        shadowOpacity: 0.5
+        shadowColor: "#020202"
+    }
     color: clickHandler.containsMouse ? Colors.base03 : Colors.base02
     property PwNode defaultAudio: Pipewire.ready ? Pipewire.defaultAudioSink : null
     property bool mute: Pipewire.ready ? defaultAudio?.audio.muted : null