Fix thumbnail stretching for non-standard image aspect ratios

Summary

Thumbnails of images with non-standard dimensions are stretched and become unreadable. A solution is needed to ensure all thumbnails are displayed comfortably, preserving aspect ratio and visual clarity.

Steps to Reproduce

Not provided.

Expected Behaviour

Thumbnails should be displayed in a comfortable way, maintaining proper proportions so that content is readable and visually pleasing.

Actual Behaviour

Thumbnails of pictures with unusual sizes are stretched and distorted, making them unreadable.

Environment

Not provided.

Reported by retoor via DevPlace.