New code verification service

frontend/pshared/lib/models/auth/login_outcome.dart

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+import 'package:pshared/models/account/account.dart';
+import 'package:pshared/models/auth/pending_login.dart';
+
+
+class LoginOutcome {
+  final Account? account;
+  final PendingLogin? pending;
+
+  const LoginOutcome._({this.account, this.pending});
+
+  factory LoginOutcome.completed(Account account) => LoginOutcome._(account: account);
+
+  factory LoginOutcome.pending(PendingLogin pending) => LoginOutcome._(pending: pending);
+
+  bool get isPending => pending != null;
+  bool get isCompleted => account != null;
+}

frontend/pshared/lib/models/auth/pending_login.dart

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+import 'package:pshared/api/responses/login_pending.dart';
+import 'package:pshared/api/responses/token.dart';
+import 'package:pshared/data/mapper/account/account.dart';
+import 'package:pshared/models/account/account.dart';
+import 'package:pshared/models/session_identifier.dart';
+
+
+class PendingLogin {
+  final Account account;
+  final TokenData pendingToken;
+  final String destination;
+  final int ttlSeconds;
+  final SessionIdentifier session;
+
+  const PendingLogin({
+    required this.account,
+    required this.pendingToken,
+    required this.destination,
+    required this.ttlSeconds,
+    required this.session,
+  });
+
+  factory PendingLogin.fromResponse(
+    PendingLoginResponse response, {
+    required SessionIdentifier session,
+  }) => PendingLogin(
+    account: response.account.account.toDomain(),
+    pendingToken: response.pendingToken,
+    destination: response.destination,
+    ttlSeconds: response.ttlSeconds,
+    session: session,
+  );
+}

frontend/pshared/lib/models/session_identifier.dart

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+import 'package:json_annotation/json_annotation.dart';
+
+part 'session_identifier.g.dart';
+
+@JsonSerializable()
+class SessionIdentifier {
+  final String clientId;
+  final String deviceId;
+
+  const SessionIdentifier({
+    required this.clientId,
+    required this.deviceId,
+  });
+
+  factory SessionIdentifier.fromJson(Map<String, dynamic> json) => _$SessionIdentifierFromJson(json);
+
+  Map<String, dynamic> toJson() => _$SessionIdentifierToJson(this);
+}