feat(auth): implement OAuth verification request and confirmation flow with error handling and UI updates

lib/features/auth/models/oauth_verification_confirm_request.dart

@@ -0,0 +1,27 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'oauth_verification_confirm_request.freezed.dart';
+part 'oauth_verification_confirm_request.g.dart';
+
+@freezed
+abstract class OAuthVerificationConfirmRequest with _$OAuthVerificationConfirmRequest {
+  const factory OAuthVerificationConfirmRequest({
+    @JsonKey(name: 'access_token') required String accessToken,
+    @JsonKey(name: 'refresh_token') required String refreshToken,
+    @JsonKey(name: 'client_id') required String clientId,
+    required String provider,
+    required String id,
+    String? email,
+    String? phone,
+    required String code,
+    @JsonKey(name: 'verification_type') required String verificationType,
+    @JsonKey(name: 'first_name') required String firstName,
+    @JsonKey(name: 'last_name') required String lastName,
+    @JsonKey(name: 'date_of_birth') required String dateOfBirth,
+    required String gender,
+    required int weight,
+    required int height,
+  }) = _OAuthVerificationConfirmRequest;
+
+  factory OAuthVerificationConfirmRequest.fromJson(Map<String, dynamic> json) => _$OAuthVerificationConfirmRequestFromJson(json);
+}