refactor(trust): ego-centric trust replaces the global Duniter membership

The global membership rule (curated bootstrap referents + sigQty/stepMax
parameters) solved sybil-proof identity for a UBI — a problem this app
doesn't have — and its screen leaked graph jargon (npub roots, parameter
steppers). Trust is now computed from the user's own position only:
you vouch / vouched by people you know (distance <=2) / vouched by N.

- TrustCubit: drop networkMember tier, referents and params; keep the
  circle rule and the 365-day vouch expiry (renewable, self-pruning).
- Delete TrustReferents, WotSettings, TrustNetworkScreen and the bundled
  referents asset; unwire injector/bootstrap/app/chat.
- New 'Your people' screen (/your-people, from the profile): who you
  vouch for (revocable) and who vouches for you, names via ProfileCache.
- i18n: wot.* removed, yourPeople.* added (en/es/pt/ast); trust.member
  removed. Kind 30777 events on relays stay fully compatible — only the
  interpretation changes.

apps/app_seeds/lib/ui/chat_screen.dart

@@ -13,9 +13,7 @@ import '../services/message_store.dart';
 import '../services/profile_cache.dart';
 import '../services/social_connection.dart';
 import '../services/social_service.dart';
-import '../services/trust_referents.dart';
 import '../services/unread_service.dart';
-import '../services/wot_settings.dart';
 import '../state/messages_cubit.dart';
 import '../state/trust_cubit.dart';
 import 'peer_avatar.dart';
@@ -31,8 +29,6 @@ class ChatScreen extends StatefulWidget {
     required this.peerPubkey,
     this.messageStore,
     this.profileCache,
-    this.trustReferents,
-    this.wotSettings,
     super.key,
   });
 
@@ -49,10 +45,6 @@ class ChatScreen extends StatefulWidget {
   /// Optional cache of peer display names; null in tests.
   final ProfileCache? profileCache;
 
-  /// Web-of-trust bootstrap referents + parameters, for the membership verdict.
-  final TrustReferents? trustReferents;
-  final WotSettings? wotSettings;
-
   @override
   State<ChatScreen> createState() => _ChatScreenState();
 }
@@ -88,8 +80,6 @@ class _ChatScreenState extends State<ChatScreen> {
     // connected / unreachable) → null transports and the screen degrades.
     final session = await widget.connection.session();
     final cachedName = await widget.profileCache?.name(widget.peerPubkey);
-    final referents = await widget.trustReferents?.all() ?? const <String>{};
-    final wotParams = await widget.wotSettings?.params() ?? WotParams.duniter;
     if (!mounted) return; // shared session is owned by the connection, not us
     final self = widget.social.publicKeyHex;
     final messages = MessagesCubit(
@@ -102,8 +92,6 @@ class _ChatScreenState extends State<ChatScreen> {
       session?.trust,
       peerPubkey: widget.peerPubkey,
       selfPubkey: self,
-      referents: referents,
-      params: wotParams,
     );
     unawaited(trust.load());
     setState(() {
@@ -323,10 +311,9 @@ class _TrustBanner extends StatelessWidget {
       builder: (context, state) {
         final cubit = context.read<TrustCubit>();
         if (!cubit.isOnline || state.loading) return const SizedBox.shrink();
-        // Strongest applicable signal decides the badge (member > circle >
-        // vouched > unknown).
+        // Strongest applicable signal decides the badge (circle > vouched >
+        // unknown).
         final (IconData icon, String label, bool strong) = switch (state.tier) {
-          TrustTier.networkMember => (Icons.verified, t.trust.member, true),
           TrustTier.inYourCircle => (Icons.verified_user, t.trust.circle, true),
           TrustTier.vouched => (
             Icons.people_outline,