feat: synchronisation mode deconnecte fin chat et stats

app/lib/core/utils/html_stub.dart

@@ -0,0 +1,24 @@
+// Stub pour les plateformes non-web
+class Window {
+  Navigator? get navigator => null;
+  CacheStorage? get caches => null;
+}
+
+class Navigator {
+  ServiceWorkerContainer? get serviceWorker => null;
+}
+
+class ServiceWorkerContainer {
+  Future<List<ServiceWorkerRegistration>>? getRegistrations() => null;
+}
+
+class ServiceWorkerRegistration {
+  Future<bool> unregister() => Future.value(false);
+}
+
+class CacheStorage {
+  Future<List<String>> keys() => Future.value([]);
+  Future<bool> delete(String name) => Future.value(false);
+}
+
+final Window window = Window();