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

CLAUDE.md

@@ -212,7 +212,7 @@ supplies:
   located and group posts go through `/clientapi/post/insert`), `AccountService` (profiles, relationships, follow,
   block, mute, follow requests, `/api/v2/search`, whose handles and URLs PrivaPub resolves), `ListService` (the
   persona's lists and their members; members are only accounts it follows, found with `accounts/search?following=true`),
-  `MediaService` (uploads), `GroupService`, `InstanceService` and `ProvenanceService`.
+  `FilterService` (the persona's v2 filters, their keywords and filtered posts), `MediaService` (uploads), `GroupService`, `InstanceService` and `ProvenanceService`.
 - **Reactions and votes are public** (owner decision, PrivaPub's ROADMAP): before a persona's first reaction or poll
   vote, `PublicNoticeService` asks it once (`PublicNoticeHost` in `MainLayout`) and remembers the persona in
   localStorage (`PublicActionNotices`). Anything else that makes a persona's act visible to others gets the same notice.
@@ -222,6 +222,11 @@ supplies:
 - **Lists** (`Pages/Lists.razor` at `/lists`): made, renamed, given a replies policy and made exclusive (their members
   leave the home feed) there, filled from the accounts the persona follows; a followed account's profile has a Lists
   menu too. A list is read as the feed's Lists tab (`FeedFilter.ListId`). Lists never leave PrivaPub.
+- **Filters** (`Pages/Filters.razor` at `/filters`, linked from Settings): PrivaPub marks every status with the filters it
+  matches (`Status.Filtered`), whatever their context; a page tells each card where it is (`Content.FilterIn`: home and
+  lists, notifications, public feeds, threads around the opened post, profiles; none for favourites, bookmarks,
+  conversations and search), and the card leaves the post out (hide), folds it behind the filter's title (warn) or blurs
+  its media (blur).
 - **Mastodon DTOs** are client-side, in `Models/Mastodon/` (snake_case). `/clientapi` DTOs come from
   `PrivaPub.ClientModels`.
 - **Where a post is** (`InstanceService.Locate`, `Models/FeedPost.cs`): its own place (Pixelfed's, `privapub.place`),