adopt MarianumConnectQuery base in remaining queries

lib/api/marianumconnect/queries/get_ticker_page/get_ticker_page.dart

@@ -4,8 +4,7 @@ import 'package:dio/dio.dart';
 
 import '../../../errors/ticker_content_unavailable_exception.dart';
 import '../../errors/marianumconnect_error.dart';
-import '../../marianumconnect_api.dart';
-import '../../marianumconnect_endpoint.dart';
+import '../../marianumconnect_query.dart';
 import 'get_ticker_page_response.dart';
 
 /// Fetches a single ticker page from
@@ -15,19 +14,17 @@ import 'get_ticker_page_response.dart';
 /// 404 `{ "error": "CONTENT_UNAVAILABLE", "webUrl": ... }`; that case is mapped
 /// to a dedicated [TickerContentUnavailableException] carrying the browser
 /// fallback URL, so the detail screen can offer "open in browser" instead of a
-/// generic error.
-class GetTickerPage {
+/// generic error. The bespoke 404 handling is why this keeps its own try/catch
+/// instead of the base [guard].
+class GetTickerPage extends MarianumConnectQuery {
   final String slug;
-  final Dio _dio;
 
-  GetTickerPage(this.slug, {Dio? dio}) : _dio = dio ?? MarianumConnectApi.dio();
+  GetTickerPage(this.slug, {super.dio});
 
   Future<TickerPageResponse> run() async {
     try {
-      final response = await _dio.get<Map<String, dynamic>>(
-        MarianumConnectEndpoint.resolve(
-          'ticker/pages/${Uri.encodeComponent(slug)}',
-        ),
+      final response = await dio.get<Map<String, dynamic>>(
+        endpoint('ticker/pages/${Uri.encodeComponent(slug)}'),
       );
       return TickerPageResponse.fromJson(response.data!);
     } on DioException catch (e) {