Connect sign-up to Sendico Facts intake (#46)

frontend/packages/sxchnge_auth/lib/src/models/verification.dart

@@ -9,7 +9,7 @@ enum VerificationStatus {
   error,
 }
 
-enum VerificationError { expired, invalid, internal }
+enum VerificationError { expired, invalid, internal, needsAssistance }
 
 class VerificationException implements Exception {
   const VerificationException(this.code);
@@ -22,8 +22,9 @@ class VerificationResult {
 }
 
 class VerificationState {
-  const VerificationState(this.status, {this.isSimulated = false});
+  const VerificationState(this.status, {this.isSimulated = false, this.error});
   final VerificationStatus status;
+  final VerificationError? error;
   final bool isSimulated;
   bool get isLoading =>
       status == VerificationStatus.sending ||