feat: block button before page loaded

index.html

@@ -124,7 +124,7 @@
           </div>
         </form>
 
-        <button id="download">Download</button>
+        <button id="download" disabled>Download</button>
       </div>
       <p id="download-status" class="hidden"></p>
 

src/index.js

@@ -187,3 +187,7 @@ document.getElementById("user-input").addEventListener("keydown", (event) => {
     onMessageSend();
   }
 });
+
+document.onload = function () {
+  document.getElementById("download").disabled = false;
+}