Stop calling client.fq() on URLs!
I think this must have been a copy-paste error from another field. When we're printing the URL of a toot or a user in the Mastodon web UI, we don't want to call client.fq() on it, which is the method that appends @domain to bare usernames.
I'm impressed at how long it's taken me to notice this bug! I think what must have happened is that nearly all Mastodon web UI URLs contain an @ sign (usually [site]/@user or [site]/@user/[more details]), which caused client.fq() to leave the string unchanged. But today I encountered an instance which formats its URLs differently, and finally noticed this glaring error.