refactor: reuse VolumeMonitor's AudioDeviceManager for device switching

Author: euxx

VolumeGrid/Audio/VolumeMonitor.swift

@@ -747,6 +747,10 @@ class VolumeMonitor: ObservableObject {
         hudEventSubject.send(event)
     }
 
+    nonisolated func setDefaultOutputDevice(_ deviceID: AudioDeviceID) -> Bool {
+        deviceManager.setDefaultOutputDevice(deviceID)
+    }
+
     private func updateVolumeSupportState(_ isSupported: Bool) {
         isCurrentDeviceVolumeSupported = isSupported
         if !isSupported {

VolumeGrid/StatusBar/StatusBarController.swift

@@ -324,8 +324,7 @@ final class StatusBarController {
         guard let deviceIDNumber = sender.representedObject as? NSNumber else { return }
         let deviceID = AudioDeviceID(deviceIDNumber.uint32Value)
 
-        let deviceManager = AudioDeviceManager()
-        let success = deviceManager.setDefaultOutputDevice(deviceID)
+        let success = volumeMonitor.setDefaultOutputDevice(deviceID)
 
         if !success {
             showError("Failed to switch audio device")