Image Sizes REST Endpoint for Headless Front Ends
Adds a public /wp-json/site/v1/image-sizes endpoint listing every registered image size with its width, height and crop setting, so headless front ends can pick the right size for each layout.
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Registered Image Sizes Under Tools
Adds a Tools > Image Sizes screen listing every image size WordPress creates on upload, with its width, height and crop mode, so you can see what themes and plugins have added.