ATProto => AP: for quotes of a bridged post, include the original Fedi URL in "RE"

[mackuba]

Example:

This is a view of my post: https://bsky.app/profile/mackuba.eu/post/3kved2m6p4c2d - which is quoting Laurens' bridged post - as seen on Misskey. The bridged Misskey view of my post correctly renders the quote of the original post by Laurens, which is here: https://indieweb.social/@laurenshof/112327889750731757.

However, the fallback link in the text body of my bridged post links to the Bluesky-bridged version of Laurens' post, i.e.: RE: https://bsky.app/profile/did:plc:43qcmg2xbxakj6mp4puqyayv/post/3kqvnekfgcwc2. It would be nicer if it instead detected that this is a bridged post and linked instead to the original Fedi post, i.e. RE: https://indieweb.social/@laurenshof/112327889750731757.

[snarfed]

Yes! Great idea. I suspect this will be nontrivial, not high priority, but still worth tracking.