[#3556232] Auto-populate Image Attributes From File URLs

Stephen Lucerorequested to merge
issue/patternkit-3556232:3556232-auto-populate-image-alt into 9.1.x

Automatically populate image attributes (alt text, width, height, title) when a user pastes a file URL into an image source field in the JSON Editor. The feature fetches attributes from associated media entities when available, and only populates empty fields to preserve user-entered values.

Closes #3556232

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