Dark mode image variants don't shrink

https://github.com/user-attachments/assets/9d5c7607-e568-4c8d-b0d3-84089245f07b

When dark mode image variants are added, they don't take up the flex-shrink and dimension values of light mode images? Causes other images to shift or shrink. Not sure if this is a technical constraint.

The issue seems to be resolved if the picture tag is set to display: block instead of display: contents.

(currently enforced using external stylesheet)

Start by locating the picture-tag rendering and the stylesheet rules controlling display, flex-shrink, and dimensions. Reproduce the layout with light and dark image variants, compare display: contents with display: block, and verify that neighboring images retain their expected size and position.

Written by the indexing model from the issue text.