Downscale cover image thumbs in "Your Books" section

[mattcen]

In the "Your Books" section in the top-left of the homepage, cover previews use a full-sized file, and sometimes render poorly as a result:

Note the jagged edges above, especially on the top row of text on the Hygge book. For the record, this is less pronounced on a retina/high-DPI screen.

Expected behavior

Ideally these images should be re-rendered as lower resolution to save on bandwidth, or perhaps they can be antialsed with CSS or something?

Instance

bookwyrm.social

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Desktop (please complete the following information):
- OS: macOS 13.7.1
- Browser: Firefox 132.0.1