implemented a backend-independent emergency notice system

lib/api/emergency/emergency_notice_client.dart

@@ -0,0 +1,34 @@
+import 'package:dio/dio.dart';
+
+import 'emergency_notice.dart';
+
+/// Loads the emergency notice from a foreign URL over a standalone [Dio]
+/// instance — no MarianumConnect interceptors, base URL or auth. That keeps the
+/// fallback fully independent of the backend it is meant to survive.
+///
+/// Fail-safe by contract: if the server is unreachable, times out, answers with
+/// a non-2xx status or delivers unparsable content, [fetch] returns `null` and
+/// nothing is shown. It never throws.
+class EmergencyNoticeClient {
+  const EmergencyNoticeClient();
+
+  Future<EmergencyNotice?> fetch(String url) async {
+    try {
+      final dio = Dio(
+        BaseOptions(
+          connectTimeout: const Duration(seconds: 5),
+          receiveTimeout: const Duration(seconds: 5),
+          sendTimeout: const Duration(seconds: 5),
+          responseType: ResponseType.plain,
+        ),
+      );
+      final response = await dio.get<String>(url);
+      final raw = response.data;
+      if (raw == null || raw.isEmpty) return null;
+      return EmergencyNotice.parse(raw);
+    } catch (_) {
+      // Server down / timeout / bad status / malformed body: show nothing.
+      return null;
+    }
+  }
+}