CSV import now accepts dynamic image URLs
Asset image links no longer need a .png, .jpg, or .jpeg extension — any public http(s) URL that serves an image now imports correctly.
When you import assets from a CSV, the imageUrl column no longer has to end in .png, .jpg, or .jpeg. Any publicly reachable http(s) link that returns an image now works — including dynamic image endpoints that have no file extension, such as an ASP.NET handler like https://host/GetImage.ashx?guid=… that serves image bytes from a query string.
Previously, links like these were rejected up front with an "Invalid image format" message before Shelf even tried to fetch them. Now Shelf downloads the image and confirms it's a real picture (PNG, JPEG, GIF, WebP, or BMP) from the file's contents rather than guessing from the URL text — so legitimate image links import reliably, and a URL that doesn't actually return an image is still caught.
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