Clear messages on scene change and log goal milestones

src/main.js

@@ -179,6 +179,7 @@
   const applyScene = (sceneId) => {
     const next = (getSceneById && getSceneById(scenes, sceneId)) || scenes[0];
     if (!next) return;
+    ui.clearMessages();
     currentScene = next;
     ui.setSceneSelection(next.id);
     setSceneIdInUrl(next.id);