feat(daemon): add migration notification

Add a brief notification, explaining that GSConnect has been
updated and some devices may require re-pairing.

src/service/daemon.js

@@ -81,6 +81,13 @@ const Service = GObject.registerClass({
             }
         }
 
+        // Notify the user
+        const notification = Gio.Notification.new(_('Settings Migrated'));
+        notification.set_body(_('GSConnect has updated to support changes to the KDE Connect protocol. Some devices may need to be repaired.'));
+        notification.set_icon(new Gio.ThemedIcon({name: 'dialog-warning'}));
+        notification.set_priority(Gio.NotificationPriority.HIGH);
+        this.send_notification('settings-migrated', notification);
+
         // Finally, reset the service ID to trigger re-generation.
         this.settings.reset('id');
     }