Add image height property to card component

[lovasoa]

Add image_height property to the card component to set the maximum height of images.

This property ensures images scale down proportionally to fit the specified height, without distortion or upscaling, by using object-fit: scale-down and a CSS variable.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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