Handle fallout from removal of overflow:auto on fill items/containers

[cpsievert]

htmltools::bindFillRole() has recently (rstudio/htmltools#399) gone all the way with removing overflow: auto from fill items/containers (and instead now uses min-height: 0 where appropriate). Those changes will also come with the removal of width: 100% (rstudio/htmltools#400).

This, at the very least, has a couple consequences for our current card()/value_box() css.

When it come to cards, I think we should add back .bslib-card{ overflow: auto; } and allow users to opt-out if they want to (perhaps with card(scroll = FALSE)?). Also, we if provide a way to opt-out there, we should probably do the same for layout_sidebar(), card_body(), etc?

When it comes to value_box(), I'm not yet sure exactly what CSS we'll want, but it seems like we can get away with just adding the width: 100% back on the showcase container. For an example of what has changed, run runApp("inst/examples/value_box") and notice how the showcase in the 2nd value box goes beyond the value_box() container

[github-actions]

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