Block the dashboard until it gets refreshed after reopening HA

The title got a little complicated, but the thing is: I have a card at the top of my dashboard which is dynamic - shows anything that’s on, basically… And even making it a glance card with 4 columns* causes the UI to jump when you reopen the app after a while and stuff has changed.

I guess a bunch of suggestions would be towards badges, but the card has some advantages:

  1. it’s a smart filter (auto-entities IIRC), so it’s much easier to populate without having to update config with every device change
  2. it has more functionality than simple badges (last modified times, no size limit, ability to mass-toggle with the entities card…)

On the other side, this flash of new content (can we call that FONC? lol) is going to happen anyway in other scenarios, and ideally should be avoided for better user experience. Thus, my question is: currently, is there any way to block the UI (think a dreaded “blocking spinner”) when the dashboard has been in the background for a while, so HA can pick up with all the changes before we try to interact with it again?

* an entities card would be better since it also includes a toggle in the header**, but then it makes the problem much worse.
** which glance could totally have as well but hey, Lovelace inconsistencies isn’t the topic lol