feat: add volume change OSD modules for audio sink and source and added Default Sink and Source to the Bar

modules/bar/states/Audio/DefaultSinkState.qml

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+pragma Singleton
+
+import QtQuick
+import Quickshell
+import Quickshell.Services.Pipewire
+
+Item {
+    id: root
+
+    PwObjectTracker {
+        objects: [ Pipewire.defaultAudioSink ]
+    }
+
+    property var audioSink: Pipewire.defaultAudioSink
+
+    property bool exists: audioSink != null
+    property bool mute: audioSink?.audio?.muted ?? false
+    property real volume: Math.round((audioSink?.audio?.volume ?? 0) * 1000) / 10
+
+    property bool volumeChanged: false
+
+	Connections {
+		target: audioSink?.audio
+
+		function onVolumeChanged() {
+			root.volumeChanged = true;
+			hideTimer.restart();
+		}
+	}
+
+    Timer {
+        id: hideTimer
+        interval: 1000
+        onTriggered: root.volumeChanged = false
+    }
+}

modules/bar/states/Audio/DefaultSourceState.qml

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+pragma Singleton
+
+import QtQuick
+import Quickshell
+import Quickshell.Services.Pipewire
+
+Item {
+    id: root
+
+    PwObjectTracker {
+        objects: [ Pipewire.defaultAudioSource ]
+    }
+
+    property var audioSource: Pipewire.defaultAudioSource
+
+    property bool exists: audioSource != null
+    property bool mute: audioSource?.audio?.muted ?? false
+    property real volume: Math.round((audioSource?.audio?.volume ?? 0) * 1000) / 10
+
+    property bool volumeChanged: false
+
+	Connections {
+		target: audioSource?.audio
+
+		function onVolumeChanged() {
+			root.volumeChanged = true;
+			hideTimer.restart();
+		}
+	}
+
+    Timer {
+        id: hideTimer
+        interval: 1000
+        onTriggered: root.volumeChanged = false
+    }
+}

modules/bar/states/Audio/qmldir

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+singleton Sink DefaultSinkState.qml
+singleton Source DefaultSourceState.qml