Show error screens in embedded mode

[robintown]

Your use case

What would you like to do?

Make sure that the error screens we're adding to the application can be shown in embedded mode as well, without the client immediately hiding the widget.

Why would you like to do it?

Because we're putting effort into creating helpful error screens, and it would be a shame for the experience in embedded mode to still just be:

1. An error occurs
2. The widget closes immediately
3. ??? Confusion

How would you like to achieve it?

When an error occurs, tell the widget to no longer be "always on screen", so that it can be closed, but at the same time make sure Element Web etc. won't just react to the disconnection by closing it immediately.

Have you considered any alternatives?

No response

Additional context

No response