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

tests/e2e/Support/PersonaApi.cs

@@ -0,0 +1,25 @@
+using System.Net;
+using System.Net.Http.Headers;
+using System.Text.Json.Nodes;
+
+namespace decePubClient.E2E.Support
+{
+	// PrivaPub's Mastodon API as a persona (its town token), for what a test sets up or checks behind the page
+	public static class PersonaApi
+	{
+		// the answer's JSON, or null for a 404
+		public static async Task<JsonNode> Call(Pasture.Persona persona, string path, HttpMethod method = null, JsonObject body = null)
+		{
+			using var http = Pasture.Http();
+			using var request = new HttpRequestMessage(method ?? HttpMethod.Get, Pasture.Api + path);
+			request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", persona.Token);
+			if (body is not null)
+				request.Content = new StringContent(body.ToJsonString(), System.Text.Encoding.UTF8, "application/json");
+			using var response = await http.SendAsync(request);
+			if (response.StatusCode == HttpStatusCode.NotFound)
+				return null;
+			response.EnsureSuccessStatusCode();
+			return JsonNode.Parse(await response.Content.ReadAsStringAsync());
+		}
+	}
+}