While working towards fixes for the image viewer, @mikayla-maki and I
discovered that we didn't have `object-fit: scale-down` implemented.
This doesn't _fully_ solve the image issues as there is some issue where
only the bounds width is updating on layout change that I haven't fully
chased down.

Co-Authored-By: @mikayla-maki 

Release Notes:

- N/A

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Co-authored-by: Mikayla Maki <mikayla@zed.dev>