Pins across servers, both ways

An account elsewhere that pins or unpins one of its posts (Add or Remove on its `featured`) now shows those pins on its
profile here (`pinned=true`), in its order and its public posts only; a community's announce of a moderator's Add does
the same for the community. The `featured` collection itself is read with the account's counts, at most once a day, so
pins made before PrivaPub ever saw an account show too. Any other target (Smithereen's wall, a community's moderators)
is dropped. A persona's pin and unpin go to the post's audience as Add and Remove on /trophies, as Mastodon sends them.

Checked live against Mastodon (scenarios/pins.sh, 8 checks). The town's checker learnt three peer rules from the
village: Misskey and Sharkey keep a forwarded reply only with its author's LD signature (only Mastodon signs), they
count no renote by a bot, and Mastodon never sees a Lemmy vote on a post in a community. The village of 2026-10-05
checks clean, 2454 of 2454.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

PrivaPub/Federation/Actors/AccountCountsJob.cs

@@ -10,17 +10,20 @@ using PrivaPub.StaticServices;
 namespace PrivaPub.Federation.Actors
 {
 	// A remote account's follower, following and post counts, as its own server publishes them (the totalItems of its
-	// followers, following and outbox collections). Read when the account is fetched, at most once a day, never when
-	// someone looks at it; a hidden or missing collection leaves its count unknown. Mastodon and GoToSocial do the same.
+	// followers, following and outbox collections), and the posts it features. Read when the account is fetched, at most
+	// once a day, never when someone looks at it; a hidden or missing collection leaves its count unknown. Mastodon and
+	// GoToSocial do the same.
 	public class AccountCountsJob : IJobHandler
 	{
 		readonly IRemoteActorService _remoteActors;
 		readonly DbEntities _dbEntities;
+		readonly IFeaturedPosts _featured;
 
-		public AccountCountsJob(IRemoteActorService remoteActors, DbEntities dbEntities)
+		public AccountCountsJob(IRemoteActorService remoteActors, DbEntities dbEntities, IFeaturedPosts featured = default)
 		{
 			_remoteActors = remoteActors;
 			_dbEntities = dbEntities;
+			_featured = featured;
 		}
 
 		public JobKind Kind => JobKind.CountAccount;
@@ -41,6 +44,8 @@ namespace PrivaPub.Federation.Actors
 				.Modify(a => a.StatusesCount, await Total(actor, actor.OutboxURL, token))
 				.Modify(a => a.CountedAt, DateTime.UtcNow)
 				.ExecuteAsync(token);
+			if (_featured != default)
+				await _featured.Sync(actor, token);
 			return JobOutcome.Done;
 		}