feat: normalize user ID in auth envelope and update hub manager assignment logic

apps/mobile/packages/features/client/authentication/lib/src/data/repositories_impl/auth_repository_impl.dart

@@ -190,7 +190,20 @@ class AuthRepositoryImpl implements AuthRepositoryInterface {
         envelope['business'] as Map<String, dynamic>?;
 
     if (businessJson != null) {
-      final ClientSession clientSession = ClientSession.fromJson(envelope);
+      // The auth envelope from buildAuthEnvelope uses `user.id` but
+      // ClientSession.fromJson expects `user.userId` (matching the shape
+      // returned by loadActorContext / GET /client/session). Normalise the
+      // key so the session is populated correctly.
+      final Map<String, dynamic> normalisedEnvelope = <String, dynamic>{
+        ...envelope,
+        if (userJson != null)
+          'user': <String, dynamic>{
+            ...userJson,
+            'userId': userJson['id'] ?? userJson['userId'],
+          },
+      };
+      final ClientSession clientSession =
+          ClientSession.fromJson(normalisedEnvelope);
       ClientSessionStore.instance.setSession(clientSession);
     }