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

static/carbone.js

@@ -283,9 +283,11 @@ function closeOnlyofficeEditor() {
   // Reload the page to clear ONLYOFFICE's in-memory state.
   // Save the active page so the user returns to Templates automatically
   sessionStorage.setItem('returnPage', 'templates');
+  // Wait 2 seconds for the save callback (status=2) to complete
+  // on our backend before reloading the page
   setTimeout(() => {
     location.reload();
-  }, 300);
+  }, 2000);
 }
 
 // Open ONLYOFFICE editor in a modal