Modifications des permissions, ajout Presta OK, vue calendrier ok

em2rp/lib/models/user_model.dart

@@ -1,3 +1,5 @@
+import 'package:cloud_firestore/cloud_firestore.dart';
+
 class UserModel {
   final String uid;
   final String firstName;
@@ -19,11 +21,20 @@ class UserModel {
 
   // Convertit une Map (Firestore) en UserModel
   factory UserModel.fromMap(Map<String, dynamic> data, String uid) {
+    String roleString;
+    final roleField = data['role'];
+    if (roleField is String) {
+      roleString = roleField;
+    } else if (roleField is DocumentReference) {
+      roleString = roleField.id;
+    } else {
+      roleString = 'USER';
+    }
     return UserModel(
       uid: uid,
       firstName: data['firstName'] ?? '',
       lastName: data['lastName'] ?? '',
-      role: data['role'] ?? 'USER',
+      role: roleString,
       profilePhotoUrl: data['profilePhotoUrl'] ?? '',
       email: data['email'] ?? '',
       phoneNumber: data['phoneNumber'] ?? '',