Register con gmail y screen welcome

lib/src/screens/login_email.dart

@@ -2,7 +2,11 @@ import 'package:flutter/material.dart';
 import 'package:font_awesome_flutter/font_awesome_flutter.dart';
 import 'package:prosappco/src/provider/google_sign.dart';
 import 'package:prosappco/src/screens/login.dart';
+import 'package:prosappco/src/screens/welcome.dart';
 import 'package:provider/provider.dart';
+
+import 'package:firebase_auth/firebase_auth.dart';
+import 'package:google_sign_in/google_sign_in.dart';
 import 'package:prosappco/src/screens/register.dart';
 
 class LoginEmailScreen extends StatefulWidget {
@@ -12,6 +16,21 @@ class LoginEmailScreen extends StatefulWidget {
   State<LoginEmailScreen> createState() => _LoginEmailScreenState();
 }
 
+final FirebaseAuth _auth = FirebaseAuth.instance;
+final GoogleSignIn googleSignIn = GoogleSignIn();
+Future<UserCredential> signInWithGoogle() async {
+  final GoogleSignInAccount? googleSignInAccount = await googleSignIn.signIn();
+  final GoogleSignInAuthentication googleSignInAuthentication =
+      await googleSignInAccount!.authentication;
+
+  final AuthCredential credential = GoogleAuthProvider.credential(
+    accessToken: googleSignInAuthentication.accessToken,
+    idToken: googleSignInAuthentication.idToken,
+  );
+
+  return await _auth.signInWithCredential(credential);
+}
+
 class _LoginEmailScreenState extends State<LoginEmailScreen> {
   bool _obscureText = true;
 
@@ -77,10 +96,23 @@ class _LoginEmailScreenState extends State<LoginEmailScreen> {
               Padding(
                 padding: EdgeInsets.only(bottom: 20),
                 child: ElevatedButton(
-                    onPressed: () {
-                      final provider = Provider.of<GoogleSignProvider>(context,
-                          listen: false);
-                      provider.googleLogin();
+                    onPressed: () async {
+                      try {
+                        final UserCredential userCredential =
+                            await signInWithGoogle();
+                        // Si la autenticación es exitosa, realiza una acción
+                        // Por ejemplo, navegar a otra pantalla:
+                        Navigator.push(
+                            context,
+                            MaterialPageRoute(
+                                builder: (context) => WelcomeScreen()));
+                      } catch (e) {
+                        // Si ocurre un error durante la autenticación, muestra un mensaje al usuario
+                        ScaffoldMessenger.of(context).showSnackBar(SnackBar(
+                          content: Text(
+                              'Error al iniciar sesion intentalo de nuevo'),
+                        ));
+                      }
                     },
                     style: ElevatedButton.styleFrom(
                       primary: Color(0xFF2BA4EC),