simplified code across the app and consolidated duplicated helpers

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

@@ -2,8 +2,8 @@ import 'dart:convert';
 
 import 'package:dio/dio.dart';
 
+import '../../../errors/app_exception.dart';
 import '../../../errors/ticker_content_unavailable_exception.dart';
-import '../../errors/marianumconnect_error.dart';
 import '../../marianumconnect_query.dart';
 import 'get_ticker_page_response.dart';
 
@@ -14,26 +14,20 @@ 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. The bespoke 404 handling is why this keeps its own try/catch
-/// instead of the base [guard].
+/// generic error.
 class GetTickerPage extends MarianumConnectQuery {
   final String slug;
 
   GetTickerPage(this.slug, {super.dio});
 
-  Future<TickerPageResponse> run() async {
-    try {
-      final response = await dio.get<Map<String, dynamic>>(
-        endpoint('ticker/pages/${Uri.encodeComponent(slug)}'),
-      );
-      return TickerPageResponse.fromJson(response.data!);
-    } on DioException catch (e) {
-      throw _mapError(e);
-    }
-  }
+  Future<TickerPageResponse> run() => getObject(
+    'ticker/pages/${Uri.encodeComponent(slug)}',
+    TickerPageResponse.fromJson,
+  );
 
-  Object _mapError(DioException e) {
-    final response = e.response;
+  @override
+  AppException mapError(DioException error) {
+    final response = error.response;
     if (response?.statusCode == 404) {
       final body = _asMap(response?.data);
       if (body != null && body['error'] == 'CONTENT_UNAVAILABLE') {
@@ -44,7 +38,7 @@ class GetTickerPage extends MarianumConnectQuery {
         );
       }
     }
-    return mapMarianumConnectError(e);
+    return super.mapError(error);
   }
 
   Map<String, dynamic>? _asMap(dynamic data) {

lib/api/marianumconnect/queries/report_client_error/client_error_reporter.dart

@@ -1,10 +1,10 @@
 import 'dart:async';
 import 'dart:developer';
-import 'dart:io';
 
 import 'package:flutter/foundation.dart';
 import 'package:package_info_plus/package_info_plus.dart';
 
+import '../../client_platform.dart';
 import 'report_client_error.dart';
 
 /// Fire-and-forget bridge from the app's global error handlers to the
@@ -61,7 +61,7 @@ class ClientErrorReporter {
         message: message,
         stacktrace: stacktrace,
         context: context,
-        platform: _platform(),
+        platform: clientPlatform(),
         appVersion: _appVersion,
       );
     } catch (e) {
@@ -73,10 +73,4 @@ class ClientErrorReporter {
     final normalized = message.toLowerCase().replaceAll(RegExp(r'\d+'), '#');
     return '$errorType|$normalized|${context ?? ''}';
   }
-
-  static String? _platform() {
-    if (Platform.isAndroid) return 'android';
-    if (Platform.isIOS) return 'ios';
-    return null;
-  }
 }

lib/api/marianumconnect/queries/submit_feedback/submit_feedback.dart

@@ -5,6 +5,7 @@ import 'dart:typed_data';
 import 'package:device_info_plus/device_info_plus.dart';
 import 'package:package_info_plus/package_info_plus.dart';
 
+import '../../client_platform.dart';
 import '../../marianumconnect_query.dart';
 
 /// Submits user feedback to MarianumConnect (`POST me/feedback`, bearer-auth).
@@ -27,7 +28,7 @@ class SubmitFeedback extends MarianumConnectQuery {
         'message': message,
         'screenshot': ?screenshotBase64,
         'screenshotContentType': screenshot != null ? screenshotContentType : null,
-        'platform': _platform(),
+        'platform': clientPlatform(),
         'appVersion': package.version,
         'appBuild': int.tryParse(package.buildNumber),
         'deviceModel': await _deviceModel(),
@@ -35,12 +36,6 @@ class SubmitFeedback extends MarianumConnectQuery {
     );
   });
 
-  static String? _platform() {
-    if (Platform.isAndroid) return 'android';
-    if (Platform.isIOS) return 'ios';
-    return null;
-  }
-
   static Future<String?> _deviceModel() async {
     try {
       final info = DeviceInfoPlugin();