fix: unique keyHash in download URL path + 2s reload delay for save callback

static/index.html

@@ -139,7 +139,7 @@
 <!-- Modals -->
 <div class="modal-overlay" id="modal-overlay"></div>
 
-<script src="/static/app.js?v=8"></script>
-<script src="/static/carbone.js?v=8"></script>
+<script src="/static/app.js?v=9"></script>
+<script src="/static/carbone.js?v=9"></script>
 </body>
 </html>