[mattwoberts]

With content moderation enabled, posts and comments awaiting approval sent the usual new post / new comment / mention notifications (and webhooks) to everyone subscribed, as if they were already published.

Changes

• Pending content: only admins and collaborators (who can see it and need to moderate it) get the new post / new comment / mention notifications. Webhooks are held back.
• On approval: everyone else gets the notifications that were held back, and the webhook fires. Staff are not notified twice; mentions are de-duplicated by the existing mention log. The email sender is the post/comment author, not the approving admin.
• Comments on a still-pending post (including staff comments) stay staff-only.
• Approving an item that is already approved is a no-op (UPDATE ... AND is_approved = false), so repeated approvals don't re-send notifications.
• Editing a comment now passes the comment's approval state to the mention task (it was previously always unset).

Testing

• New task tests: pending post → staff only, no webhook; approved post → non-staff only, webhook fires, author as sender; pending comment with a mention → staff only.
• New storage test: approve post/comment reports a change only the first time.
• Existing notification test fixtures updated to mark posts/comments as approved and set the author.
• golangci-lint clean, go test ./... passing.

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