dashboard: optimise cava

Use refs to prevent loading at all times

modules/dashboard/Media.qml

@@ -108,6 +108,10 @@ Item {
                 easing.bezierCurve: Appearance.anim.curves.standard
             }
         }
+
+        Ref {
+            service: Cava
+        }
     }
 
     StyledClippingRect {

services/Cava.qml

@@ -8,12 +8,16 @@ Singleton {
     id: root
 
     property list<int> values
+    property int refCount
 
     Process {
         running: true
         command: ["sh", "-c", `printf '[general]\nframerate=60\nbars=${Config.dashboard.visualiserBars}\n[output]\nchannels=mono\nmethod=raw\nraw_target=/dev/stdout\ndata_format=ascii\nascii_max_range=100' | cava -p /dev/stdin`]
         stdout: SplitParser {
-            onRead: data => root.values = data.slice(0, -1).split(";").map(v => parseInt(v, 10))
+            onRead: data => {
+                if (root.refCount)
+                    root.values = data.slice(0, -1).split(";").map(v => parseInt(v, 10));
+            }
         }
     }
 }

widgets/Ref.qml

@@ -0,0 +1,9 @@
+import Quickshell
+import QtQuick
+
+QtObject {
+    required property Singleton service
+
+    Component.onCompleted: service.refCount++
+    Component.onDestruction: service.refCount--
+}