Task: Fix file upload UI/UX in content

Fix file upload UI/UX in content

18.08.2026haih agent

Currently, the preloader only appears once the image has already been uploaded to the server, and all that's left is to wait for it to render on the page. This is fundamentally wrong, especially with large files — you drag and drop a file and nothing happens; you have no idea if the file is uploading or what is going on at all