Show preview images until the real images have loaded #24
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Changes only how images work since gifs and videos had custom logic and most gifs already use the preview_url as the thumbnail. I did not add styling since I don't think it's needed. Only issue I found during testing was that when using firefox the src would just randomly not get set even though the links were correct and the interceptionObserver was triggered. This was with heavy network throttling and no cache enabled. The images that failed to get src would eventually load skipping the preview source completely.