audio: add IPC & OSD for changing output audio device

fixes #754

quickshell/Common/KeybindActions.js

@@ -59,6 +59,7 @@ const DMS_ACTIONS = [
     { id: "spawn dms ipc call audio decrement 10", label: "Volume Down (10%)" },
     { id: "spawn dms ipc call audio mute", label: "Volume Mute Toggle" },
     { id: "spawn dms ipc call audio micmute", label: "Microphone Mute Toggle" },
+    { id: "spawn dms ipc call audio cycleoutput", label: "Audio Output: Cycle" },
     { id: "spawn dms ipc call brightness increment", label: "Brightness Up" },
     { id: "spawn dms ipc call brightness increment 1", label: "Brightness Up (1%)" },
     { id: "spawn dms ipc call brightness increment 5", label: "Brightness Up (5%)" },

quickshell/Common/SettingsData.qml

@@ -313,6 +313,7 @@ Singleton {
     property bool osdMicMuteEnabled: true
     property bool osdCapsLockEnabled: true
     property bool osdPowerProfileEnabled: true
+    property bool osdAudioOutputEnabled: true
 
     property bool powerActionConfirm: true
     property int powerActionHoldDuration: 1

quickshell/Common/settings/SettingsSpec.js

@@ -212,6 +212,7 @@ var SPEC = {
     osdMicMuteEnabled: { def: true },
     osdCapsLockEnabled: { def: true },
     osdPowerProfileEnabled: { def: false },
+    osdAudioOutputEnabled: { def: true },
 
     powerActionConfirm: { def: true },
     powerActionHoldDuration: { def: 1 },