Enhance user authentication handling by adding authMethod to UserModel and updating ProfileContent to display authentication method details.

lib/blocs/user/user_state.dart

@@ -72,15 +72,19 @@ class UserModel {
   /// User's last name (optional).
   final String? nom;
   
+  /// Platform used for authentication (e.g., 'google', 'apple', 'email').
+  final String? authMethod;
+  
   /// Creates a new [UserModel] instance.
   /// 
   /// [id], [email], and [prenom] are required fields.
-  /// [nom] is optional and can be null.
+  /// [nom] and [authMethod] are optional and can be null.
   UserModel({
     required this.id,
     required this.email,
     required this.prenom,
     this.nom,
+    this.authMethod,
   });
   
   /// Creates a [UserModel] instance from a JSON map.
@@ -93,6 +97,7 @@ class UserModel {
       email: json['email'] ?? '',
       prenom: json['prenom'] ?? 'Voyageur',
       nom: json['nom'],
+      authMethod: json['authMethod'] ?? json['platform'],
     );
   }
   
@@ -105,6 +110,7 @@ class UserModel {
       'email': email,
       'prenom': prenom,
       'nom': nom,
+      'authMethod': authMethod,
     };
   }
 }