feat: add OAuth redirect handling and update Google OAuth integration

mobile/app/(auth)/login.tsx

@@ -7,7 +7,6 @@ import { zodResolver } from '@hookform/resolvers/zod';
 import { z } from 'zod';
 import { Ionicons } from '@expo/vector-icons';
 import * as Google from 'expo-auth-session/providers/google';
-import * as WebBrowser from 'expo-web-browser';
 import { Screen } from '@presentation/components/layout/Screen';
 import { Input } from '@presentation/components/ui/Input';
 import { Button } from '@presentation/components/ui/Button';
@@ -16,9 +15,6 @@ import { loginUseCase, googleLoginUseCase } from '@infrastructure/container';
 import { useAuthStore } from '@store/authStore';
 import { CatIcon } from '@presentation/components/icons/CatIcon';
 
-// Necessário para fechar o browser após redirect OAuth no Android/iOS
-WebBrowser.maybeCompleteAuthSession();
-
 const schema = z.object({
   email: z.string().email('E-mail inválido'),
   password: z.string().min(1, 'Senha obrigatória'),

mobile/app/oauthredirect.tsx

@@ -0,0 +1,11 @@
+import * as WebBrowser from 'expo-web-browser';
+
+// Esta tela é o destino do redirect OAuth (meowspool://oauthredirect?code=...).
+// maybeCompleteAuthSession() detecta os parâmetros da URL, sinaliza o
+// expo-auth-session para fechar o browser e entregar o resultado ao hook
+// useAuthRequest em login.tsx.
+WebBrowser.maybeCompleteAuthSession();
+
+export default function OAuthRedirect(): null {
+  return null;
+}