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/test/state/trust_cubit_test.dart

@@ -83,6 +83,7 @@ void main() {
     final inCircle = TrustCubit(transport, peerPubkey: peer, selfPubkey: me);
     await inCircle.load();
     expect(inCircle.state.knownToYou, isTrue);
+    expect(inCircle.state.tier, TrustTier.inYourCircle);
     await inCircle.close();
 
     final outside = TrustCubit(transport, peerPubkey: 'other', selfPubkey: me);
@@ -91,39 +92,6 @@ void main() {
     await outside.close();
   });
 
-  test('network membership: enough referent vouches → member', () async {
-    const params =
-        WotParams(sigQty: 2, stepMax: 5, sigValidity: Duration(days: 365));
-    final transport = FakeTrustTransport(me)
-      ..addCert('r1', peer)
-      ..addCert('r2', peer);
-    final cubit = TrustCubit(
-      transport,
-      peerPubkey: peer,
-      selfPubkey: me,
-      referents: {'r1', 'r2'},
-      params: params,
-    );
-    await cubit.load();
-    expect(cubit.state.networkBootstrapped, isTrue);
-    expect(cubit.state.isNetworkMember, isTrue);
-    expect(cubit.state.tier, TrustTier.networkMember);
-    await cubit.close();
-  });
-
-  test('with no referents, membership is undetermined (not a member)',
-      () async {
-    final transport = FakeTrustTransport(me)
-      ..addCert('r1', peer)
-      ..addCert('r2', peer);
-    // referents default to {} → the trust net isn't seeded.
-    final cubit = TrustCubit(transport, peerPubkey: peer, selfPubkey: me);
-    await cubit.load();
-    expect(cubit.state.networkBootstrapped, isFalse);
-    expect(cubit.state.isNetworkMember, isFalse);
-    await cubit.close();
-  });
-
   test('tier falls back to vouched, then unknown', () async {
     final vouched = TrustCubit(
         FakeTrustTransport(me)..addCert('someone', peer),