Handle DMs from unknown ActivityPub senders

[akirk]

Summary

• Save private ActivityPub messages from actors you do not follow by creating an inactive sender identity.
• Allow replying to those inactive ActivityPub DM sender feeds without following them.
• Add an async follower-status pill to ActivityPub friend profiles so DM deliverability can be checked.

Testing

• composer check-cs
• php -l feed-parsers/class-feed-parser-activitypub.php
• php -l templates/frontend/author-header.php
• php -l templates/frontend/messages.php
• node --check friends.js
• Verified Diego Galvalisi follower status on alex.kirk.at via the new AJAX handler.

Changelog

• Automatically create a changelog entry from the details below

Type

• Fixed

Message

Show direct messages from ActivityPub users you do not follow and surface follower status on their profile.

[github-actions]

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