fix(rich-text): show the selected headline inside of lists

[chrishelgert]

We always picked the first item to check if it's a headline.
Inside lists it would be deeper nested so we need a further iteration.

[aodhagan-cf]

LGTM one other test you could consider would be when you press enter, should it keep the type?

If you have a heading 1 in a list and you make a new list item, should it also be a heading 1?

[chrishelgert]

LGTM one other test you could consider would be when you press enter, should it keep the type?

If you have a heading 1 in a list and you make a new list item, should it also be a heading 1?

That should be still the same behaviour as before - it goes back to paragraph.
Reached out to the team, maybe a nice UX improvement for the future, as we keep bold and so on but not headlines