Enhance User model with optional fields and update authentication methods to include profile picture and phone number

lib/repositories/auth_repository.dart

@@ -61,6 +61,7 @@ class AuthRepository {
     } catch (e) {
       _errorService.showError(message: 'Utilisateur ou mot de passe incorrect');
     }
+    return null;
   }
 
   /// Creates a new user account with email and password.
@@ -93,6 +94,9 @@ class AuthRepository {
         email: email,
         nom: nom,
         prenom: prenom,
+        phoneNumber: 'Uknown',
+        platform: 'email',
+        profilePictureUrl: '',
       );
 
       await _firestore.collection('users').doc(user.id).set(user.toMap());
@@ -100,6 +104,7 @@ class AuthRepository {
     } catch (e) {
       _errorService.showError(message: 'Erreur lors de la création du compte');
     }
+    return null;
   }
 
   /// Signs in a user using Google authentication.
@@ -127,6 +132,9 @@ class AuthRepository {
           email: firebaseUser.user!.email ?? '',
           nom: '',
           prenom: firebaseUser.user!.displayName ?? 'User',
+          phoneNumber: firebaseUser.user!.phoneNumber ?? 'Uknown',
+          profilePictureUrl: firebaseUser.user!.photoURL,
+          platform: 'google',
         );
 
         await _firestore.collection('users').doc(user.id).set(user.toMap());
@@ -162,6 +170,9 @@ class AuthRepository {
           email: firebaseUser.user!.email ?? '',
           nom: '',
           prenom: firebaseUser.user!.displayName ?? 'User',
+          phoneNumber: firebaseUser.user!.phoneNumber ?? 'Uknown',
+          profilePictureUrl: firebaseUser.user!.photoURL,
+          platform: 'apple',
         );
 
         await _firestore.collection('users').doc(user.id).set(user.toMap());