Notifications in groups, and what is unread

The Notifications tab reads grouped notifications (/api/v2/notifications):
likes and boosts of one post, or follows of one hour, are one card naming
both accounts of a pair, or the newest and how many others, with their
avatars. A notification the stream tells joins its group and waits on top.
The tab's badge counts what is unread; opening the tab moves the
notifications marker to the newest shown, which reads it on PrivaPub.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

MastodonJsonContext.cs

@@ -48,6 +48,9 @@ namespace decePubClient;
 [JsonSerializable(typeof(Tag))]
 [JsonSerializable(typeof(List<Tag>))]
 [JsonSerializable(typeof(List<TrendLink>))]
+[JsonSerializable(typeof(GroupedNotifications))]
+[JsonSerializable(typeof(MarkersForm))]
+[JsonSerializable(typeof(UnreadCount))]
 public partial class MastodonJsonContext : JsonSerializerContext
 {
 }