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5c0438f695
The follow button was completely hidden for suspended, staged, and bot
users. This meant that if a user followed someone who was later
suspended, they had no way to unfollow them without an admin
unsuspending and re-suspending the account.
The root cause was that `follow-button.gjs` unconditionally hid the
button based on the target user's state, with no distinction between
the follow and unfollow actions. On top of that, the `can_follow`
serializer field only checked `allow_people_to_follow_me` and not the
other states (suspended, staged, bot, self), so the client had to
duplicate those checks.
This commit introduces a `Guardian#can_follow?` method as the single
source of truth for follow permissions. The serializer delegates to it,
and the client simply shows the button when the user is already followed
OR can be followed. The `Updater` also uses the guardian as a first
check, then determines the specific error reason on failure to provide
meaningful error messages.
Other cleanups:
- Replace manual `raise if !current_user` checks with `requires_login`
- Fix mismatched i18n keys (`cannot_follow_*` → `user_cannot_follow_*`)
- Fix typo in locale ("suspend" → "suspended")
https://meta.discourse.org/t/304256
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