Additional ui.card features

[lucas-nelson-uiuc]

Really enjoy working with ui.card() - would love if one of the two ideas could be implemented below:

1. ui.card_body()
   Noticed this in experimental so just showing support for it making it to the core package one day.
2. ui.card(..., on_full_screen: Callable = func)
   Sometimes my cards have a lot of text or would benefit from having additional, more detailed content than available in the rendered card. I was wondering if there could be an additional argument passed to ui.card() called on_fullscreen that, when the card enters full_screen mode, renders additional, more detailed content.

Example

from htmltools._core import Tag

def render_additional_detail() -> Tag:
    # include tables, plots, etc.
    return ui.div(...)

ui.card(
    # render in full screen or not-------
    ui.card_header('Header'),
    ui.p('initially rendered body'),
    ui.card_footer('Footer'),
    # ---------------------------------
    full_screen=True,
    # render when in full screen-------
    on_full_screen=render_additional_detail
    # ---------------------------------
)

3. Possible implementation of both ideas
   I think something like this could work to implement both ideas (could also alleviate need for callable like above).

ui.card(
    ui.card_header('Header'),
    ui.card_body('some text'), # appears in rendered card
    ui.card_body('magic text', full_screen_only=True), # appears only in `full_screen` mode
   # ... additional card body elements, like tables, plots, etc.
    ui.card_footer('Footer'),
    full_screen=True
)

Let me know if either of these are already implemented and I'm missing something. Thanks!