Clear messages on scene change and log goal milestones

src/ui.js

@@ -234,6 +234,12 @@
 
     const activeMessages = [];
 
+    const clearMessages = () => {
+      if (!floatingMessagesEl) return;
+      activeMessages.length = 0;
+      floatingMessagesEl.innerHTML = "";
+    };
+
     const showFloatingMessage = (message, options = {}) => {
       if (!floatingMessagesEl) return;
       const msgObj =
@@ -285,6 +291,7 @@
       setGoal,
       showFloatingMessage,
       setMessageDefaults,
+      clearMessages,
     };
     return api;
   };