implemented the Ticker module with a native ProseMirror document renderer and integrated API support for structured content, navigation trees, and proxied files

lib/api/marianumconnect/queries/get_ticker/get_ticker.dart

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+import 'package:dio/dio.dart';
+
+import '../../errors/marianumconnect_error.dart';
+import '../../marianumconnect_api.dart';
+import '../../marianumconnect_endpoint.dart';
+import 'get_ticker_response.dart';
+
+/// Fetches the current "Aktuelles" ticker post from
+/// `GET /api/mobile/v1/ticker`. Bearer token is attached by the shared dio.
+class GetTicker {
+  final Dio _dio;
+
+  GetTicker({Dio? dio}) : _dio = dio ?? MarianumConnectApi.dio();
+
+  Future<TickerResponse> run() async {
+    try {
+      final response = await _dio.get<Map<String, dynamic>>(
+        MarianumConnectEndpoint.resolve('ticker'),
+      );
+      return TickerResponse.fromJson(response.data!);
+    } on DioException catch (e) {
+      throw mapMarianumConnectError(e);
+    }
+  }
+}

lib/api/marianumconnect/queries/get_ticker/get_ticker_response.dart

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+import 'package:json_annotation/json_annotation.dart';
+
+part 'get_ticker_response.g.dart';
+
+/// The "Aktuelles" ticker post from `GET /api/mobile/v1/ticker`.
+///
+/// [available] is false when the current post has no ProseMirror JSON yet (a
+/// legacy post not re-saved since the dual-write rollout); the backend still
+/// returns 200 with `content: null` so the home surface degrades to a
+/// "open in browser" hint rather than an error. Unknown/missing flags default
+/// to a safe empty state.
+@JsonSerializable()
+class TickerResponse {
+  @JsonKey(defaultValue: 1)
+  final int schemaVersion;
+
+  @JsonKey(defaultValue: false)
+  final bool available;
+
+  final String? hash;
+  final String? publishedAt;
+
+  /// Site-relative link to the web ticker (e.g. `/ticker`); the app prefixes
+  /// the active Marianum-Connect base URL.
+  @JsonKey(defaultValue: '/ticker')
+  final String webUrl;
+
+  /// Nested ProseMirror document (`{ type: doc, content: [...] }`) or null when
+  /// [available] is false. Parsed to a `PmNode` at render time.
+  final Map<String, dynamic>? content;
+
+  TickerResponse({
+    required this.schemaVersion,
+    required this.available,
+    this.hash,
+    this.publishedAt,
+    required this.webUrl,
+    this.content,
+  });
+
+  factory TickerResponse.fromJson(Map<String, dynamic> json) =>
+      _$TickerResponseFromJson(json);
+  Map<String, dynamic> toJson() => _$TickerResponseToJson(this);
+}

lib/api/marianumconnect/queries/get_ticker/get_ticker_response.g.dart

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+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'get_ticker_response.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+TickerResponse _$TickerResponseFromJson(Map<String, dynamic> json) =>
+    TickerResponse(
+      schemaVersion: (json['schemaVersion'] as num?)?.toInt() ?? 1,
+      available: json['available'] as bool? ?? false,
+      hash: json['hash'] as String?,
+      publishedAt: json['publishedAt'] as String?,
+      webUrl: json['webUrl'] as String? ?? '/ticker',
+      content: json['content'] as Map<String, dynamic>?,
+    );
+
+Map<String, dynamic> _$TickerResponseToJson(TickerResponse instance) =>
+    <String, dynamic>{
+      'schemaVersion': instance.schemaVersion,
+      'available': instance.available,
+      'hash': instance.hash,
+      'publishedAt': instance.publishedAt,
+      'webUrl': instance.webUrl,
+      'content': instance.content,
+    };