refactor: perf improvement stopping singletons with ref

Also switch to scale+opacity anims with custom curve

Common/Ref.qml

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