Very minimal volume widget and PWAudioService

Services/PipeWireAudio.qml

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+pragma Singleton
+
+import QtQuick
+import Quickshell
+import Quickshell.Io
+import Quickshell.Services.Pipewire
+
+Singleton {
+  id: root
+
+  // Ensure the volume is readonly from outside
+  readonly property alias volume: root._volume
+  property real _volume: 0
+
+  readonly property alias muted: root._muted
+  property bool _muted: false
+
+  PwObjectTracker {
+    objects: [Pipewire.defaultAudioSink]
+  }
+
+  Connections {
+    target: Pipewire.defaultAudioSink?.audio ? Pipewire.defaultAudioSink?.audio : null
+
+    function onVolumeChanged() {
+      root._volume = (Pipewire.defaultAudioSink?.audio.volume ?? 0)
+      console.log("onVolumeChanged: " + volume)
+    }
+  }
+}