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/services/trust_referents_test.dart

@@ -1,45 +0,0 @@
-import 'package:flutter_test/flutter_test.dart';
-import 'package:tane/services/trust_referents.dart';
-
-import '../support/test_support.dart';
-
-void main() {
-  const npub =
-      'npub180cvv07tjdrrgpa0j7j7tmnyl2yr6yr7l8j4s3evf6u64th6gkwsyjh6w6';
-  const hex =
-      '3bf0c63fcb93463407af97a5e5ee64fa883d107ef9e558472c4eb9aaaefa459d';
-
-  // No bundled asset in the unit test bundle → _bundled() degrades to empty, so
-  // these exercise the user-added set (the cold-start bootstrap path).
-  late TrustReferents referents;
-  setUp(() => referents = TrustReferents(InMemorySecretStore()));
-
-  test('starts empty', () async {
-    expect(await referents.all(), isEmpty);
-    expect(await referents.userAdded(), isEmpty);
-  });
-
-  test('adds a referent from an npub, storing hex', () async {
-    final stored = await referents.add(npub);
-    expect(stored, hex);
-    expect(await referents.userAdded(), {hex});
-    expect(await referents.all(), contains(hex));
-  });
-
-  test('accepts a hex key directly and is idempotent', () async {
-    await referents.add(hex);
-    await referents.add(npub); // same identity, npub form
-    expect(await referents.userAdded(), {hex});
-  });
-
-  test('rejects an invalid identity code', () async {
-    expect(() => referents.add('not-a-key'), throwsFormatException);
-    expect(await referents.userAdded(), isEmpty);
-  });
-
-  test('removes a referent', () async {
-    await referents.add(hex);
-    await referents.remove(hex);
-    expect(await referents.userAdded(), isEmpty);
-  });
-}

apps/app_seeds/test/services/wot_settings_test.dart

@@ -1,28 +0,0 @@
-import 'package:commons_core/commons_core.dart';
-import 'package:flutter_test/flutter_test.dart';
-import 'package:tane/services/wot_settings.dart';
-
-import '../support/test_support.dart';
-
-void main() {
-  late WotSettings settings;
-  setUp(() => settings = WotSettings(InMemorySecretStore()));
-
-  test('defaults to the Duniter parameters', () async {
-    expect(await settings.params(), WotParams.duniter);
-  });
-
-  test('persists saved parameters', () async {
-    const custom = WotParams(
-        sigQty: 3, stepMax: 4, sigValidity: Duration(days: 180));
-    await settings.save(custom);
-    expect(await settings.params(), custom);
-  });
-
-  test('reset restores the Duniter defaults', () async {
-    await settings.save(const WotParams(
-        sigQty: 1, stepMax: 1, sigValidity: Duration(days: 30)));
-    await settings.reset();
-    expect(await settings.params(), WotParams.duniter);
-  });
-}