config: allow configuring external audio program

Closes #302

README.md

@@ -156,6 +156,7 @@ All configuration options are in `~/.config/caelestia/shell.json`.
     },
     "bar": {
         "dragThreshold": 20,
+        "externalAudioProgram": ["pavucontrol"],
         "persistent": true,
         "showOnHover": true,
         "status": {

config/BarConfig.qml

@@ -4,6 +4,7 @@ JsonObject {
     property bool persistent: true
     property bool showOnHover: true
     property int dragThreshold: 20
+    property list<string> externalAudioProgram: ["pavucontrol"]
     property Workspaces workspaces: Workspaces {}
     property Status status: Status {}
     property Sizes sizes: Sizes {}

modules/bar/popouts/Audio.qml

@@ -43,7 +43,7 @@ ColumnLayout {
         StateLayer {
             function onClicked(): void {
                 root.wrapper.hasCurrent = false;
-                Quickshell.execDetached(["pavucontrol"]);
+                Quickshell.execDetached(["app2unit", "--", ...Config.bar.externalAudioProgram]);
             }
         }