@Vlad I have a branch where I have added a "Summarize" button which was fairly easy to do thanks to the simple URL structure of the Universal Summarizer.
The only issue is that there is not much room in the UI on desktop mode, and no room at all on mobile so the user interface starts to fall apart
I could submit a PR if you are happy with the UI issues, but if you are understandably not then there is going to have to be some work done to rework the UI.
For those who are able to/interested in running this patch locally you can find my branch at https://github.com/CarwynNelson/smallweb/tree/feat/universal-summariser
Attached are some screenshots of what it currently looks like