Hardcover covers are now optional
Hardcover no longer downloads book covers automatically. A new "Download covers from Hardcover" setting (off by default) controls it, so linking a book pulls its description, rating and metadata without saving any cover images. Turn it on if you want Hardcover covers.
Added "Remove downloaded covers" (under Manage Hardcover data) to clear out covers saved by earlier versions - it restores each book's original cover and keeps your links and descriptions.