The <img> carried max-w-[min(100%,var(--image-preview-max-width))] while its
container was w-fit max-w-full. A percentage max-width resolves to none while
the container measures its fit-content width, so the container took the full
column while the image stayed capped — and the absolutely positioned download
button, which anchors to the container, drifted into the margin on any image
wider than it is tall.
Move the width cap onto the container and leave the image at max-w-full. The
container now shrink-wraps the rendered image, so right-2/top-2 lands on the
image's own corner at every aspect ratio.
2e61feb94e