R7 custom emoji in decePub: the server's own, administered, picked, suggested and shown

Administration has a Custom emoji section (EmojiPanel, data-admin-section=emoji): the server's emoji by category, added
with a picture streamed from the file, changed (category, picker, disabled, picture; never the shortcode) and deleted,
asked first, with PrivaPub's 409 and 422 in the dialog. EmojiService reads /clientapi/admin/emoji and, for everyone,
/api/v1/custom_emojis, kept a day in localStorage (CustomEmojiCache) and read again after a change here. EmojiPicker
(a DDropdown sheet on a phone, rendered only while open) offers them by category with common unicode emoji, searchable:
the composer writes the choice at the caret, a card and the announcements banner react with it. The composer suggests
custom emoji after `:` and two letters. Custom reactions toggle as :shortcode: and show their picture, notifications of
one too; located posts, announcements and NavMenu's persona names render the server's emoji.

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

Models/APIs.cs

@@ -78,6 +78,10 @@ public static class APIs
 		public const string GET_AdminRelays = "clientapi/admin/relays";
 		public const string POST_AdminRelayInsert = "clientapi/admin/relays/insert";
 		public static string POST_M_AdminRelayDelete(string address) => $"clientapi/admin/relays/delete?address={Uri.EscapeDataString(address)}";
+		public const string GET_AdminEmojis = "clientapi/admin/emoji/list";
+		public const string POST_AdminEmojiInsert = "clientapi/admin/emoji/insert";
+		public const string POST_AdminEmojiUpdate = "clientapi/admin/emoji/update";
+		public static string POST_M_AdminEmojiDelete(string shortcode) => $"clientapi/admin/emoji/delete?shortcode={Uri.EscapeDataString(shortcode)}";
 		public const string GET_AdminDomainBlocks = "clientapi/admin/domainblocks/list";
 		public const string POST_AdminDomainBlock = "clientapi/admin/domainblocks/insert";
 		public static string POST_M_AdminDomainUnblock(string domain) => $"clientapi/admin/domainblocks/delete?domain={Uri.EscapeDataString(domain)}";
@@ -145,6 +149,7 @@ public static class APIs
 		public const string GET_InstanceTermsOfService = "api/v1/instance/terms_of_service";
 		public const string GET_InstanceDomainBlocks = "api/v1/instance/domain_blocks";
 		public const string GET_Announcements = "api/v1/announcements";
+		public const string GET_CustomEmojis = "api/v1/custom_emojis";
 		public static string POST_M_DismissAnnouncement(string announcementId) => $"api/v1/announcements/{Uri.EscapeDataString(announcementId)}/dismiss";
 		public static string M_AnnouncementReaction(string announcementId, string emoji) =>
 			$"api/v1/announcements/{Uri.EscapeDataString(announcementId)}/reactions/{Uri.EscapeDataString(emoji)}";

Models/CustomEmojiCache.cs

@@ -0,0 +1,14 @@
+using decePubClient.Models.Mastodon;
+
+namespace decePubClient.Models;
+
+/// <summary>
+/// The server's custom emoji its picker offers (/api/v1/custom_emojis), as EmojiService last read them: kept in
+/// localStorage under its type name and used for a day, then read again (at once after an administrator changes one in
+/// this client).
+/// </summary>
+public class CustomEmojiCache
+{
+	public DateTime FetchedAt { get; set; }
+	public List<CustomEmoji> Emojis { get; set; } = [];
+}

Models/FeedPost.cs

@@ -72,6 +72,7 @@ public class FeedPost
 				Account = sample.FirstOrDefault(),
 				Status = status,
 				Emoji = group.Emoji,
+				EmojiUrl = group.EmojiUrl,
 				GroupKey = group.GroupKey,
 				ModerationWarning = group.ModerationWarning
 			},

Models/Mastodon/Account.cs

@@ -73,11 +73,15 @@ public class AccountField
 	public DateTime? VerifiedAt { get; set; }
 }
 
+/// <summary>A custom emoji: one a post or an account names (its server's), or one of this server's own as
+/// /api/v1/custom_emojis lists them for the picker, with its category.</summary>
 public class CustomEmoji
 {
 	public string Shortcode { get; set; }
 	public string Url { get; set; }
 	public string StaticUrl { get; set; }
+	public bool VisibleInPicker { get; set; }
+	public string Category { get; set; }
 }
 
 public class Relationship

Models/Mastodon/Announcement.cs

@@ -15,15 +15,19 @@ public class Announcement
 	/// <summary>Whether the persona dismissed it.</summary>
 	public bool? Read { get; set; }
 	public List<AnnouncementReaction> Reactions { get; set; } = [];
+	/// <summary>The server's custom emoji its text names.</summary>
+	public List<CustomEmoji> Emojis { get; set; } = [];
 }
 
-/// <summary>A unicode emoji chosen on an announcement, how many personas chose it, and whether this one did.</summary>
+/// <summary>An emoji chosen on an announcement (a unicode one, or the shortcode of one of the server's custom emoji, which
+/// has its pictures), how many personas chose it, and whether this one did.</summary>
 public class AnnouncementReaction
 {
 	public string Name { get; set; }
 	public int Count { get; set; }
 	public bool? Me { get; set; }
 	public string Url { get; set; }
+	public string StaticUrl { get; set; }
 }
 
 /// <summary>The streaming API's announcement.reaction payload: the emoji, how many chose it now, and on which.</summary>

Models/Mastodon/Notification.cs

@@ -11,7 +11,10 @@ public class Notification
 	public DateTime CreatedAt { get; set; }
 	public Account Account { get; set; }
 	public Status Status { get; set; }
+	/// <summary>A reaction's emoji: the emoji itself, or a custom emoji's shortcode.</summary>
 	public string Emoji { get; set; }
+	/// <summary>A custom emoji reaction's picture.</summary>
+	public string EmojiUrl { get; set; }
 	/// <summary>The group it belongs to (likes and boosts of one post, follows within an hour), or ungrouped-{id}.</summary>
 	public string GroupKey { get; set; }
 	/// <summary>A moderation_warning's: what this server's staff did and told the persona. Its Account is the persona
@@ -52,6 +55,7 @@ public class NotificationGroup
 	public List<string> SampleAccountIds { get; set; } = [];
 	public string StatusId { get; set; }
 	public string Emoji { get; set; }
+	public string EmojiUrl { get; set; }
 	/// <summary>A moderation_warning group's newest warning.</summary>
 	public AccountWarning ModerationWarning { get; set; }
 }