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/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>