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/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; }
 }