The wallet has (almost) no coverage: https://maflcko.github.io/b-c-cov/fuzz.coverage/src/wallet/index-sort-l.html. We should change that!

Issues like #27271 should be quite easy for high level fuzz targets to find.

(For people that are interested but unfamiliar with the wallet (like me): I suspect that looking at the unit tests could be helpful for figuring out where to start)