nested_closeable_modal design suggestion

> No, I was referring to the `id` argument of `nested_closeable_modal`. I see now that I was mistaken. I thought it was the id that the modal gets automatically but it is one that you specifically add to it so that it han be targeted by hide/show messages.
>
> Still, you could do `modalDialog() %>% nested_closeable_modal(., id = <"id">)`
>

_Originally posted by @chlebowa in https://github.com/insightsengineering/teal.widgets/issues/199#issuecomment-1768351314_

The issue points to the nested_closeable_modal and modalDialog() entry points and references the discussion in issue 199. Start by reading those entry points and the linked discussion; completion requires an agreed design and explicit acceptance criteria, which the current text does not provide.

Written by the indexing model from the issue text.