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deprecated/lib/services/app_navigator.dart

@@ -0,0 +1,29 @@
+import 'package:flutter/material.dart';
+import 'auth_service.dart';
+
+/// Global navigator and messenger keys so services can navigate/logout
+final GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
+final GlobalKey<ScaffoldMessengerState> messengerKey = GlobalKey<ScaffoldMessengerState>();
+
+/// Handle expired authentication: clear stored token and navigate to login.
+Future<void> handleAuthExpired({String? message}) async {
+  try {
+    await AuthService().logout();
+  } catch (_) {}
+
+  // Show a message if possible
+  try {
+    final messenger = messengerKey.currentState;
+    if (messenger != null && message != null) {
+      messenger.showSnackBar(SnackBar(content: Text(message)));
+    }
+  } catch (_) {}
+
+  // Navigate to login, removing all previous routes
+  try {
+    final nav = navigatorKey.currentState;
+    if (nav != null) {
+      nav.pushNamedAndRemoveUntil('/login', (r) => false);
+    }
+  } catch (_) {}
+}