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

Services/TimelineService.cs

@@ -20,7 +20,7 @@ namespace decePubClient.Services
 	/// circle post reads as private there); located posts come from /clientapi/post/nearby with their authors read from
 	/// /api/v1/accounts, and have no next page. Results are WebResults with a FeedPage as Data; nothing throws.
 	/// </summary>
-	public class TimelineService(IHttpService httpService, ILoggingService logger, CoalescingStringLocalizer localizer)
+	public class TimelineService(IHttpService httpService, EmojiService emojiService, ILoggingService logger, CoalescingStringLocalizer localizer)
 	{
 		public const int PageSize = 20;
 		/// <summary>The most ids /api/v1/statuses reads at once.</summary>
@@ -238,7 +238,8 @@ namespace decePubClient.Services
 			return new WebResult { Data = new FeedPage { Posts = [.. ids.Select(id => statuses.GetValueOrDefault(id)).Where(s => s is not null).Select(FeedPost.Of)] } };
 		}
 
-		/// <summary>Located posts within their range of the reader, nearest first, with their authors.</summary>
+		/// <summary>Located posts within their range of the reader, nearest first, with their authors. They are this server's,
+		/// and /clientapi sends no emoji with them: the server's custom emoji their words name are taken from its list.</summary>
 		async Task<WebResult> Nearby(FeedQuery query, CancellationToken cancellationToken)
 		{
 			using var response = await httpService.Get(APIs.ClientApi.GET_Nearby,
@@ -255,6 +256,9 @@ namespace decePubClient.Services
 			foreach (var authorId in posts.Select(p => p.AuthorAvatarId).Where(id => id is not null).Distinct())
 				if (await Account(authorId, cancellationToken) is { } account)
 					authors[authorId] = account;
+			var emojis = new Dictionary<string, List<CustomEmoji>>();
+			foreach (var post in posts)
+				emojis[post.Id] = await emojiService.NamedIn([post.ContentHtml, post.Title], cancellationToken);
 
 			return new WebResult
 			{
@@ -279,6 +283,7 @@ namespace decePubClient.Services
 								CreatedAt = post.CreationDate,
 								Sensitive = post.HasContentWarning,
 								Visibility = post.Visibility,
+								Emojis = emojis.GetValueOrDefault(post.Id) ?? [],
 								Privapub = post.Title is { Length: > 0 } ? new() { Title = post.Title } : null
 							}
 						})