Generate a cool preview card for playground links

Linking to the playground, say for example: https://csskit.rs/playground/?code=VVBLboMwEF3jU8wmUhrJCa3UTXOHnAGDJ9gqeJBtEpoqd88YQyR2fr%2BZ56lJ%2F8G%2FAOiVb637gXKYzgwHpbV1LWOPfSJq8hq9vFsdDbOZXNBnWe7O4inEsaZpnnYlF2WwD2Txa4jJ21mH0qBtTWTy%2BJ0DFA36OfKetSxcrWU2js7GDkOQD%2FTEgWJtkvoWb%2FOMejXJjZyIjUUUpwNcyCHQFbhCQAiGxk5DQ%2B6GPkLFvgoi8aOCw0kUm%2F55bFT18smMl52N6po932SYQCblgyUpR%2Ffr6L5e%2BPkC&format=minify doesn't generate a social graph preview.

It would be _awesome_ if we could generate a social graph preview card on the fly, and use the `code=` parameter to generate an image with the code embedded. This might be possible with for e.g. a worker or some such.

Just a wild idea I wanted to track in case I ever get round to it (or a cool project for someone else to pick up??)