Bluesky: on DM request, if requestee's DMs aren't open, reply with error

[snarfed]

...by checking chat.bsky.actor.declaration. Suggested by @qazmlp and @mackuba in #966 (comment).

[stefanbohacek]

Perhaps it would make sense to @ mention the invited account publicly when DMs are closed?

[snarfed]

Hmm, maybe. The bots don't currently make any public transactional posts or @-mentions like this, though, and I'm a bit reluctant to start. For this use case specifically, I'd probably just encourage the requester to post the @-mention themselves.

[stefanbohacek]

Yes, I've seen a few people do that. Personally it feels a bit awkward for me to reach out to strangers who will likely just ignore me. And I am not sure if it's any less annoying, from the point of the invited person, to get this message from a bot, or someone you don't now.

But fair enough, I definitely understand!