R8 the Mastodon API made real in decePub: featured tags, notify, languages, recommendations, notes, suggestions, the direct stream

A profile shows the hashtags an account features as chips opening their feed; under another account's header is what the
persona keeps of it for itself alone: for one it follows, a bell (follow with notify), the languages of its posts that
reach the home feed (follow with languages[]) and Recommend (endorsements, private here), and for any account a private
note saved on blur or with Save. Settings edits the persona's featured hashtags (added by name or from those used lately,
10 at most) and its reading preferences (/clientapi/avatar/private/preferences), which CascadingState keeps per persona
and the card applies to sensitive media and content warnings. A hashtag's tab features it on the profile. Explore has Who
to follow (/api/v2/suggestions, dismissed for good after asking); Administration has Staff picks. The Direct tab follows
the direct stream's conversation events; status notifications show the post. The follows CSV carries notify and languages.

Verified: Release build, 0 errors (the 3 warnings were there before). Not run against PrivaPub or in the pasture.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WpVCoDeM1qUTRp4fXQdfof

Services/InstanceAdminService.cs

@@ -150,6 +150,42 @@ namespace decePubClient.Services
 			return await RelayList(response, cancellationToken);
 		}
 
+		/// <summary>The accounts the staff suggest first to every persona, in their order; one no longer shown (deleted,
+		/// suspended or silenced since) has IsShown false.</summary>
+		public async Task<List<ViewStaffPick>> StaffPicks(CancellationToken cancellationToken = default)
+		{
+			using var response = await httpService.Get(APIs.ClientApi.GET_AdminStaffPicks, cancellationToken: cancellationToken);
+			if (response.IsSuccessStatusCode)
+				return await response.DefaultReadFromJsonAsync<List<ViewStaffPick>>(cancellationToken) ?? [];
+
+			await LogFailure(response, nameof(StaffPicks), cancellationToken);
+			return [];
+		}
+
+		/// <summary>Suggests an account to every persona, by its Mastodon id: a persona here or a person elsewhere. PrivaPub
+		/// answers 404 for no such account, 409 for one picked already, 422 past its 40. Data is the picks now.</summary>
+		public async Task<WebResult> AddStaffPick(string accountId, CancellationToken cancellationToken = default)
+		{
+			using var response = await httpService.Post(APIs.ClientApi.POST_AdminStaffPickInsert, new StaffPickForm { AccountId = accountId },
+				cancellationToken: cancellationToken);
+			return await StaffPickList(response, cancellationToken);
+		}
+
+		/// <summary>No longer suggests the account (it can be picked again); Data is the picks now.</summary>
+		public async Task<WebResult> RemoveStaffPick(string accountId, CancellationToken cancellationToken = default)
+		{
+			using var response = await httpService.Post(APIs.ClientApi.POST_M_AdminStaffPickDelete(accountId), cancellationToken: cancellationToken);
+			return await StaffPickList(response, cancellationToken);
+		}
+
+		async Task<WebResult> StaffPickList(HttpResponseMessage response, CancellationToken cancellationToken)
+		{
+			if (!response.IsSuccessStatusCode)
+				return await response.Content.ReadWebResult(response.StatusCode, localizer, cancellationToken);
+
+			return new WebResult { Data = await response.DefaultReadFromJsonAsync<List<ViewStaffPick>>(cancellationToken) ?? [] };
+		}
+
 		async Task<WebResult> Saved(HttpResponseMessage response, CancellationToken cancellationToken)
 		{
 			if (!response.IsSuccessStatusCode)