use brightness service from caelestia-dots/shell

.config/quickshell/modules/onScreenDisplay/OnScreenDisplayVolume.qml

@@ -28,6 +28,13 @@ Scope {
         }
     }
 
+    Connections {
+        target: Brightness
+        function onBrightnessChanged() {
+            showOsdValues = false
+        }
+    }
+
     Connections {
         target: Audio.sink?.audio ?? null
         function onVolumeChanged() {
@@ -40,14 +47,6 @@ Scope {
         }
     }
 
-    Connections {
-        target: Brightness ?? null
-        function onValueChanged() {
-            if (!Brightness.ready) return
-            root.showOsdValues = false
-        }
-    }
-
     Variants {
         model: Quickshell.screens