Employ embedded thumbnail extraction

And store all direct thumbnailer output in the browser's cache--
low-quality thumbnails will always be regenerated, as is desired,
and we'll reload faster on devices where we don't store thumbnails.

This change improves latency at the cost of overall efficiency,
seeing as images with thumbnails will be spent cycles on twice.

Keeping this out-of-process avoids undesired lock-ups.
Moreover, embedded thumbnails can be fairly expensive to decode.

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