Add phone number field to UserModel and update ProfileContent to display user phone number

lib/blocs/user/user_state.dart

@@ -75,16 +75,20 @@ class UserModel {
   /// Platform used for authentication (e.g., 'google', 'apple', 'email').
   final String? authMethod;
   
+  /// User's phone number (optional).
+  final String? phoneNumber;
+  
   /// Creates a new [UserModel] instance.
   /// 
   /// [id], [email], and [prenom] are required fields.
-  /// [nom] and [authMethod] are optional and can be null.
+  /// [nom], [authMethod], and [phoneNumber] are optional and can be null.
   UserModel({
     required this.id,
     required this.email,
     required this.prenom,
     this.nom,
     this.authMethod,
+    this.phoneNumber,
   });
   
   /// Creates a [UserModel] instance from a JSON map.
@@ -98,6 +102,7 @@ class UserModel {
       prenom: json['prenom'] ?? 'Voyageur',
       nom: json['nom'],
       authMethod: json['authMethod'] ?? json['platform'],
+      phoneNumber: json['phoneNumber'],
     );
   }
   
@@ -111,6 +116,7 @@ class UserModel {
       'prenom': prenom,
       'nom': nom,
       'authMethod': authMethod,
+      'phoneNumber': phoneNumber,
     };
   }
 }