Three cards-side-by-side fixes: the hover invite is one pill over the
thumbnail instead of a mask that blacked out the glyph; a file card drops the
type row its extension badge already states (an image keeps it, having no
badge), which leaves name plus size; and the thumbnail read now keys off the
attachment id instead of the reference object, which the fold re-proves on
every render — a row re-render no longer re-reads the bytes through the
harness loader. The in-flight card also reports itself busy to assistive tech.
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