feat(loans): confirm declared material state changes

eme-frontend/lib/models/checklist_element_item.dart

@@ -0,0 +1,22 @@
+class ChecklistElementItem {
+  const ChecklistElementItem({
+    required this.accessoireId,
+    required this.nom,
+    required this.etat,
+    required this.quantite,
+  });
+
+  factory ChecklistElementItem.fromJson(Map<String, dynamic> json) {
+    return ChecklistElementItem(
+      accessoireId: json["accessoireId"] as int?,
+      nom: json["nomElement"] as String,
+      etat: json["etat"] as String,
+      quantite: json["quantiteConstatee"] as int,
+    );
+  }
+
+  final int? accessoireId;
+  final String nom;
+  final String etat;
+  final int quantite;
+}