Filters: made on /filters, applied by each card where it is

The persona's filters (PrivaPub's /api/v2/filters): made, given words and
whole-word rules, contexts, an action and an expiry on /filters (linked from
Settings), and deleted; posts filtered one by one can be taken out. Every
status says which filters it matches; each page tells its cards where they
are (home and lists, notifications, public feeds, the thread around the
opened post, profiles), and a card leaves its post out (hide), folds it
behind the filter's title with a way to show it anyway (warn), or blurs its
media (blur). The e2e test folds and then hides a post of the persona's own.

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

MastodonJsonContext.cs

@@ -38,6 +38,10 @@ namespace decePubClient;
 [JsonSerializable(typeof(MastodonList))]
 [JsonSerializable(typeof(List<MastodonList>))]
 [JsonSerializable(typeof(ListAccountsForm))]
+[JsonSerializable(typeof(Filter))]
+[JsonSerializable(typeof(List<Filter>))]
+[JsonSerializable(typeof(FilterForm))]
+[JsonSerializable(typeof(FilterStatus))]
 public partial class MastodonJsonContext : JsonSerializerContext
 {
 }