hardened API decoding against server fields the models did not expect

The Talk room list crashed for a new account because the server omits
lastMessage for rooms without a visible message and the model required it.
Beyond that single field, a review of the Talk models against the OpenAPI
spec of the installed version (23.0.8) found the same crash class in several
places: closed enums over open server values (inCall bitmask, rich-object
types, actor and message types), a deleted parent sent as {id, deleted},
and the autocomplete status arriving as an object.

- json_serializable `checked: true`: decode errors now name class and field
- lists (rooms, messages, participants, autocomplete) decode per entry;
  a malformed entry is skipped and reported via ClientErrorReporter
- unknownEnumValue fallbacks for all response enums of Talk and breakers
- lastMessage nullable; inCall as bitmask; deleted parent placeholder;
  autocomplete status object/string; fixed shareWithDisplayNameUnique key
- GetRoomParams no longer sends null query parameters

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HrepDTL4qDe35TuS29sLW3

lib/api/marianumcloud/autocomplete/autocomplete_api.dart

@@ -5,6 +5,8 @@ import 'package:http/http.dart' as http;
 import '../../../model/endpoint_data.dart';
 import '../../errors/server_exception.dart';
 import '../../http_errors.dart';
+import '../../json_lenient.dart';
+import '../../marianumconnect/queries/report_client_error/client_error_reporter.dart';
 import '../nextcloud_ocs.dart';
 import 'autocomplete_response.dart';
 
@@ -43,6 +45,13 @@ class AutocompleteApi {
         technicalDetails: 'core/autocomplete/get: ${response.body}',
       );
     }
-    return AutocompleteResponse.fromJson(NextcloudOcs.decode(response.body));
+    final result = AutocompleteResponse.fromJson(
+      NextcloudOcs.decode(response.body),
+    );
+    ClientErrorReporter.reportDecodeWarnings(
+      'Autocomplete',
+      drainDecodeWarnings(),
+    );
+    return result;
   }
 }

lib/api/marianumcloud/autocomplete/autocomplete_response.dart

@@ -1,5 +1,6 @@
 import 'package:json_annotation/json_annotation.dart';
 
+import '../../json_lenient.dart';
 import '../files_sharing/queries/share/share.dart';
 
 part 'autocomplete_response.g.dart';
@@ -14,6 +15,7 @@ int shareTypeFromSource(String? source) {
 
 @JsonSerializable(explicitToJson: true)
 class AutocompleteResponse {
+  @JsonKey(fromJson: _entriesFromJson)
   List<AutocompleteResponseObject> data;
 
   AutocompleteResponse(this.data);
@@ -23,15 +25,31 @@ class AutocompleteResponse {
   Map<String, dynamic> toJson() => _$AutocompleteResponseToJson(this);
 }
 
+List<AutocompleteResponseObject> _entriesFromJson(Object? raw) =>
+    decodeListLenient(
+      raw,
+      AutocompleteResponseObject.fromJson,
+      what: 'autocomplete entry',
+    );
+
+/// The server sends a user-status object for users that have one and an empty
+/// string otherwise; only the status string itself is kept.
+String? _statusFromJson(Object? raw) => switch (raw) {
+  Map<String, dynamic> status => status['status']?.toString(),
+  String status when status.isNotEmpty => status,
+  _ => null,
+};
+
 @JsonSerializable()
 class AutocompleteResponseObject {
   String id;
   String label;
   String? icon;
   String? source;
+  @JsonKey(fromJson: _statusFromJson)
   String? status;
   String? subline;
-  String? shareWithDisplayNameUniqe;
+  String? shareWithDisplayNameUnique;
 
   AutocompleteResponseObject(
     this.id,
@@ -40,7 +58,7 @@ class AutocompleteResponseObject {
     this.source,
     this.status,
     this.subline,
-    this.shareWithDisplayNameUniqe,
+    this.shareWithDisplayNameUnique,
   );
 
   factory AutocompleteResponseObject.fromJson(Map<String, dynamic> json) =>

lib/api/marianumcloud/autocomplete/autocomplete_response.g.dart

@@ -8,13 +8,12 @@ part of 'autocomplete_response.dart';
 
 AutocompleteResponse _$AutocompleteResponseFromJson(
   Map<String, dynamic> json,
-) => AutocompleteResponse(
-  (json['data'] as List<dynamic>)
-      .map(
-        (e) => AutocompleteResponseObject.fromJson(e as Map<String, dynamic>),
-      )
-      .toList(),
-);
+) => $checkedCreate('AutocompleteResponse', json, ($checkedConvert) {
+  final val = AutocompleteResponse(
+    $checkedConvert('data', (v) => _entriesFromJson(v)),
+  );
+  return val;
+});
 
 Map<String, dynamic> _$AutocompleteResponseToJson(
   AutocompleteResponse instance,
@@ -22,15 +21,18 @@ Map<String, dynamic> _$AutocompleteResponseToJson(
 
 AutocompleteResponseObject _$AutocompleteResponseObjectFromJson(
   Map<String, dynamic> json,
-) => AutocompleteResponseObject(
-  json['id'] as String,
-  json['label'] as String,
-  json['icon'] as String?,
-  json['source'] as String?,
-  json['status'] as String?,
-  json['subline'] as String?,
-  json['shareWithDisplayNameUniqe'] as String?,
-);
+) => $checkedCreate('AutocompleteResponseObject', json, ($checkedConvert) {
+  final val = AutocompleteResponseObject(
+    $checkedConvert('id', (v) => v as String),
+    $checkedConvert('label', (v) => v as String),
+    $checkedConvert('icon', (v) => v as String?),
+    $checkedConvert('source', (v) => v as String?),
+    $checkedConvert('status', (v) => _statusFromJson(v)),
+    $checkedConvert('subline', (v) => v as String?),
+    $checkedConvert('shareWithDisplayNameUnique', (v) => v as String?),
+  );
+  return val;
+});
 
 Map<String, dynamic> _$AutocompleteResponseObjectToJson(
   AutocompleteResponseObject instance,
@@ -41,5 +43,5 @@ Map<String, dynamic> _$AutocompleteResponseObjectToJson(
   'source': instance.source,
   'status': instance.status,
   'subline': instance.subline,
-  'shareWithDisplayNameUniqe': instance.shareWithDisplayNameUniqe,
+  'shareWithDisplayNameUnique': instance.shareWithDisplayNameUnique,
 };