Fix settings dialog to use onClosed handler.

qml/SettingsDialog.qml

@@ -90,9 +90,12 @@ The prompt below is a question to answer, a task to complete, or a conversation
         Download.downloadLocalModelsPath = settings.modelPath
     }
 
-    Component.onDestruction: {
+    Connections {
+        target: settingsDialog
+        function onClosed() {
             settings.sync()
         }
+    }
 
     Item {
         Accessible.role: Accessible.Dialog