Tidied up how unsubscribe works in campaign emails. Recipients now see a single Unsubscribe link in each email, and clicking it removes them from just that mailing list rather than blocking every email from your group. There's a separate "update your email subscriptions" link beside it for anyone who wants to manage all their subscriptions at once.
\nFor developers, the click-through chain now resolves correctly when testing locally instead of bouncing out to the live site.
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