AT => AP: translate @-mentions in profile bio

[c960657]

When a Bluesky profile description contains an account handle, it is automatically converted into a link to the account's profile page.

But when bridged to the Fediverse, the handles are not converted to their bridged counterparts (if they exists), so the automatic link conversion in Mastodon gives weird results.

Profile on Bluesky

https://bsky.app/profile/lex.aggemam.dk

Note that @aggemam.dk and @snl.aggemam.dk are displayed as links to the corresponding profile pages.

Profile on Mastodon

https://mastodon.social/@lex.aggemam.dk@bsky.brid.gy

Note that @aggemam.dk is displayed as plain text, and @snl.aggemam.dk is displayed “@​snl.” in plain-text followed by “aggemam.dk” which links to http://aggemam.dk. Both accounts are bridged, so I would expect them to be converted into links to @aggemam.dk@bsky.brid.gy and @snl.aggemam.dk@bsky.brid.gy, respectively.

If an account is not bridged, I suggest inserting e.g. a zero-width space after the @ to bypass the Mastodon handle auto-linker.

This is the like #1986 but in the opposite direction.

[snarfed]

True! Thanks for filing! Good feature request.