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

Pages/Index.razor

@@ -74,7 +74,7 @@
 
 					@foreach (var post in posts)
 					{
-						<Content @key="post.Key" Post="post" OnDeleted="Remove" OnReplied="Replied" OnTag="OpenTag" />
+						<Content @key="post.Key" Post="post" FilterIn="FilterIn" OnDeleted="Remove" OnReplied="Replied" OnTag="OpenTag" />
 					}
 
 					<div id="@SentinelId" class="flex justify-center min-h-8 text-xs opacity-60">
@@ -175,6 +175,16 @@
 		_ = PollNewer(pageCancellation.Token);
 	}
 
+	/// <summary>Which of the persona's filters apply to this feed: home's for home and lists, public's for the shared
+	/// feeds, none for the persona's own collections (favourites, bookmarks) and conversations.</summary>
+	FilterContext? FilterIn => Filter.TimelineType switch
+	{
+		TimelineType.Home or TimelineType.Lists => FilterContext.Home,
+		TimelineType.Local or TimelineType.Federation or TimelineType.Tag or TimelineType.Nearby or TimelineType.Groups => FilterContext.Public,
+		TimelineType.Notifications => FilterContext.Notifications,
+		_ => null
+	};
+
 	FeedQuery Query => new(Filter.TimelineType, CascadingState.PersonaId, Filter.GroupId, groups.FirstOrDefault(g => g.Id == Filter.GroupId)?.IsCommunity == true,
 		Filter.Tag, position?.Latitude, position?.Longitude, Filter.ListId);