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/AuthService.cs

@@ -121,6 +121,32 @@ namespace decePubClient.Services
 			return new WebResult();
 		}
 
+		/// <summary>How one of the root's personas reads what others post (its reading preferences: media and content
+		/// warnings), or null when they can't be read.</summary>
+		public async Task<ViewPersonaPreferences> PersonaPreferences(string personaId, CancellationToken cancellationToken = default)
+		{
+			using var response = await httpService.Get(APIs.ClientApi.GET_PersonaPreferences, [$"avatarId={Uri.EscapeDataString(personaId)}"],
+				cancellationToken: cancellationToken);
+			if (!response.IsSuccessStatusCode)
+			{
+				await LogFailure(response, nameof(PersonaPreferences), cancellationToken);
+				return null;
+			}
+
+			return await response.DefaultReadFromJsonAsync<ViewPersonaPreferences>(cancellationToken);
+		}
+
+		/// <summary>Saves a persona's reading preferences, which Mastodon's API only reads (/api/v1/preferences); Data is the
+		/// ViewPersonaPreferences PrivaPub keeps. A mode it doesn't know is its 422.</summary>
+		public async Task<WebResult> SavePersonaPreferences(PersonaPreferencesForm form, CancellationToken cancellationToken = default)
+		{
+			using var response = await httpService.Post(APIs.ClientApi.POST_PersonaPreferences, form, cancellationToken: cancellationToken);
+			if (!response.IsSuccessStatusCode)
+				return await response.Content.ReadWebResult(response.StatusCode, localizer, cancellationToken);
+
+			return new WebResult { Data = await response.DefaultReadFromJsonAsync<ViewPersonaPreferences>(cancellationToken) };
+		}
+
 		/// <summary>Acts as the persona from now on, exchanging a token for it unless it has one.</summary>
 		public async Task<WebResult> UsePersona(string personaId, CancellationToken cancellationToken = default)
 		{