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

LayerComponents/CascadingState.razor

@@ -6,7 +6,8 @@
    compare PersonaId to reload what belongs to the persona. With PageSettings.SyncWithLogin the theme is the login's:
    taken at sign-in and at start-up, saved there a moment after it changes here. A persona the staff suspended is never
    acted as: it can't be chosen, and when PrivaPub refuses the current one a token (TokenAuthStateProvider.PersonaRefused)
-   the session moves to another persona of the login, or to none, and says why once. *@
+   the session moves to another persona of the login, or to none, and says why once. The current persona's reading
+   preferences (how its cards show media and content warnings) are read with it and kept here. *@
 <CascadingValue IsFixed=false Value=this>
 	@ChildContent
 </CascadingValue>
@@ -43,6 +44,12 @@
 	public string PersonaId { get; private set; }
 	/// <summary>That persona's Mastodon account, null until it is read.</summary>
 	public Account Persona { get; private set; }
+	/// <summary>How that persona reads what others post (media shown or hidden, content warnings open or folded), read when
+	/// it is acted as; PrivaPub's defaults until then, or when they can't be read. A change replaces the object, which the
+	/// cards' render key holds.</summary>
+	public ViewPersonaPreferences Preferences { get; private set; } = new();
+	/// <summary>Preferences.ExpandMedia as the cards use it.</summary>
+	public ExpandMedia ExpandMedia => ExpandMediaModes.Of(Preferences.ExpandMedia);
 	/// <summary>The root handles reports and moderates accounts and posts (its JWT's policies); PrivaPub checks it anyway.</summary>
 	public bool IsModerator { get; private set; }
 	/// <summary>The root administers the server (its JWT's policies); PrivaPub checks it anyway.</summary>
@@ -226,6 +233,7 @@
 				await AuthStateProvider.SetPersona(null, cancellationToken: cancellationToken);
 			PersonaId = null;
 			Persona = null;
+			Preferences = new();
 			IsSessionLoaded = true;
 			StateHasChanged();
 			return;
@@ -261,10 +269,22 @@
 		Persona = await AuthService.CurrentAccount(cancellationToken);
 		if (Persona?.Host is { } host)
 			InstanceService.SelfHost = host;
+		Preferences = await AuthService.PersonaPreferences(personaId, cancellationToken) ?? new() { AvatarId = personaId };
 		StateHasChanged();
 		return result;
 	}
 
+	/// <summary>The current persona's reading preferences as PrivaPub now keeps them, after Settings saved them; the cards
+	/// show them from their next render.</summary>
+	public void PreferencesChanged(ViewPersonaPreferences preferences)
+	{
+		if (preferences is null || preferences.AvatarId != PersonaId)
+			return;
+
+		Preferences = preferences;
+		StateHasChanged();
+	}
+
 	/// <summary>Reads the root's personas again, after one was made.</summary>
 	public async Task ReloadPersonas(CancellationToken cancellationToken = default)
 	{
@@ -293,6 +313,7 @@
 			await AuthStateProvider.SetPersona(null, cancellationToken: cancellationToken);
 			PersonaId = null;
 			Persona = null;
+			Preferences = new();
 			StateHasChanged();
 			return;
 		}
@@ -338,6 +359,7 @@
 					await AuthStateProvider.SetPersona(null, cancellationToken: cancellationToken);
 					PersonaId = null;
 					Persona = null;
+					Preferences = new();
 					Toast.AddWarning(suspended
 						? Localizer["{0} is suspended by this server's staff, and no other persona of this login can act now.", name]
 						: Localizer["{0} can no longer be used, and no other persona of this login can act now.", name]);
@@ -405,6 +427,7 @@
 		Personas = [];
 		PersonaId = null;
 		Persona = null;
+		Preferences = new();
 	}
 
 	async Task KeepSessionFresh(CancellationToken cancellationToken)