Pinned posts on profiles, and pinning from the card

A profile shows the posts the account pins above its posts (pinned=true: for an account elsewhere, what it features,
which PrivaPub now keeps); the persona pins and unpins its own public and unlisted posts from the card's menu, and
PrivaPub tells its followers. tests/e2e/Actions/PinTests.cs pins from the card and finds the post first on the profile;
the whole e2e suite passes against the reseeded village (122, 4 skipped).

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

Services/AccountService.cs

@@ -144,6 +144,17 @@ namespace decePubClient.Services
 			};
 		}
 
+		/// <summary>The posts the account pins, in its order: what it features, for an account elsewhere.</summary>
+		public async Task<List<FeedPost>> Pinned(string accountId, CancellationToken cancellationToken = default)
+		{
+			using var response = await httpService.Get(APIs.Mastodon.GET_M_AccountStatuses(accountId), ["pinned=true"], cancellationToken: cancellationToken);
+			if (response.IsSuccessStatusCode)
+				return [.. (await response.MastodonReadFromJsonAsync<List<Status>>(cancellationToken) ?? []).Select(FeedPost.Of)];
+
+			await LogFailure(response, nameof(Pinned), cancellationToken);
+			return [];
+		}
+
 		/// <summary>The accounts waiting for the persona to accept their follow.</summary>
 		public async Task<List<Account>> FollowRequests(CancellationToken cancellationToken = default)
 		{

Services/StatusService.cs

@@ -21,7 +21,9 @@ namespace decePubClient.Services
 		Reblog,
 		Unreblog,
 		Bookmark,
-		Unbookmark
+		Unbookmark,
+		Pin,
+		Unpin
 	}
 
 	/// <summary>