feat: Integrate phone number verification handling for test numbers in authentication flow

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

@@ -4,6 +4,7 @@ import 'package:firebase_auth/firebase_auth.dart';
 import 'package:firebase_data_connect/firebase_data_connect.dart';
 import 'package:krow_data_connect/krow_data_connect.dart';
 import 'package:krow_domain/krow_domain.dart' as domain;
+import '../../utils/test_phone_numbers.dart';
 import '../../domain/ui_entities/auth_mode.dart';
 
 import '../../domain/repositories/auth_repository_interface.dart';
@@ -41,7 +42,17 @@ class AuthRepositoryImpl implements AuthRepositoryInterface {
 
     await firebaseAuth.verifyPhoneNumber(
       phoneNumber: phoneNumber,
-      verificationCompleted: (_) {
+      verificationCompleted: (PhoneAuthCredential credential) {
+        // Skip auto-verification for test numbers to allow manual code entry
+        if (TestPhoneNumbers.isTestNumber(phoneNumber)) {
+          return;
+        }
+
+        // For real numbers, we can support auto-verification if desired.
+        // But since this method returns a verificationId for manual OTP entry,
+        // we might not handle direct sign-in here unless the architecture changes.
+        // Currently, we just ignore it for the completer flow, 
+        // or we could sign in directly if the credential is provided.
       },
       verificationFailed: (FirebaseAuthException e) {
         if (!completer.isCompleted) {

apps/mobile/packages/features/staff/authentication/lib/src/utils/test_phone_numbers.dart

@@ -0,0 +1,12 @@
+class TestPhoneNumbers {
+  static const List<String> values = [
+    '+15555555555', // Test User 1
+    '+15551234567', // Test User 2
+    '+16505551234', // Android Emulator
+    '+12345678910', // iOS Simulator
+  ];
+
+  static bool isTestNumber(String phoneNumber) {
+    return values.contains(phoneNumber);
+  }
+}