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/talk/room/get_room_response.g.dart

@@ -7,16 +7,18 @@ part of 'get_room_response.dart';
 // **************************************************************************
 
 GetRoomResponse _$GetRoomResponseFromJson(Map<String, dynamic> json) =>
-    GetRoomResponse(
-        (json['data'] as List<dynamic>)
-            .map(
-              (e) => GetRoomResponseObject.fromJson(e as Map<String, dynamic>),
-            )
-            .toSet(),
-      )
-      ..headers = (json['headers'] as Map<String, dynamic>?)?.map(
-        (k, e) => MapEntry(k, e as String),
+    $checkedCreate('GetRoomResponse', json, ($checkedConvert) {
+      final val = GetRoomResponse(
+        $checkedConvert('data', (v) => _roomsFromJson(v)),
       );
+      $checkedConvert(
+        'headers',
+        (v) => val.headers = (v as Map<String, dynamic>?)?.map(
+          (k, e) => MapEntry(k, e as String),
+        ),
+      );
+      return val;
+    });
 
 Map<String, dynamic> _$GetRoomResponseToJson(GetRoomResponse instance) =>
     <String, dynamic>{
@@ -26,41 +28,61 @@ Map<String, dynamic> _$GetRoomResponseToJson(GetRoomResponse instance) =>
 
 GetRoomResponseObject _$GetRoomResponseObjectFromJson(
   Map<String, dynamic> json,
-) => GetRoomResponseObject(
-  (json['id'] as num).toInt(),
-  json['token'] as String,
-  $enumDecode(_$GetRoomResponseObjectConversationTypeEnumMap, json['type']),
-  json['name'] as String,
-  json['displayName'] as String,
-  json['description'] as String,
-  (json['participantType'] as num).toInt(),
-  (json['participantFlags'] as num).toInt(),
-  (json['readOnly'] as num).toInt(),
-  (json['listable'] as num).toInt(),
-  (json['lastPing'] as num).toInt(),
-  json['sessionId'] as String,
-  json['hasPassword'] as bool,
-  json['hasCall'] as bool,
-  (json['callFlag'] as num).toInt(),
-  json['canStartCall'] as bool,
-  json['canDeleteConversation'] as bool,
-  json['canLeaveConversation'] as bool,
-  (json['lastActivity'] as num).toInt(),
-  json['isFavorite'] as bool,
-  $enumDecode(
-    _$GetRoomResponseObjectParticipantNotificationLevelEnumMap,
-    json['notificationLevel'],
-  ),
-  (json['unreadMessages'] as num).toInt(),
-  json['unreadMention'] as bool,
-  json['unreadMentionDirect'] as bool,
-  (json['lastReadMessage'] as num).toInt(),
-  (json['lastCommonReadMessage'] as num).toInt(),
-  GetChatResponseObject.fromJson(json['lastMessage'] as Map<String, dynamic>),
-  json['status'] as String?,
-  json['statusIcon'] as String?,
-  json['statusMessage'] as String?,
-);
+) => $checkedCreate('GetRoomResponseObject', json, ($checkedConvert) {
+  final val = GetRoomResponseObject(
+    $checkedConvert('id', (v) => (v as num).toInt()),
+    $checkedConvert('token', (v) => v as String),
+    $checkedConvert(
+      'type',
+      (v) => $enumDecode(
+        _$GetRoomResponseObjectConversationTypeEnumMap,
+        v,
+        unknownValue: GetRoomResponseObjectConversationType.unknown,
+      ),
+    ),
+    $checkedConvert('name', (v) => v as String),
+    $checkedConvert('displayName', (v) => v as String),
+    $checkedConvert('description', (v) => v as String),
+    $checkedConvert('participantType', (v) => (v as num).toInt()),
+    $checkedConvert('participantFlags', (v) => (v as num).toInt()),
+    $checkedConvert('readOnly', (v) => (v as num).toInt()),
+    $checkedConvert('listable', (v) => (v as num).toInt()),
+    $checkedConvert('lastPing', (v) => (v as num).toInt()),
+    $checkedConvert('sessionId', (v) => v as String),
+    $checkedConvert('hasPassword', (v) => v as bool),
+    $checkedConvert('hasCall', (v) => v as bool),
+    $checkedConvert('callFlag', (v) => (v as num).toInt()),
+    $checkedConvert('canStartCall', (v) => v as bool),
+    $checkedConvert('canDeleteConversation', (v) => v as bool),
+    $checkedConvert('canLeaveConversation', (v) => v as bool),
+    $checkedConvert('lastActivity', (v) => (v as num).toInt()),
+    $checkedConvert('isFavorite', (v) => v as bool),
+    $checkedConvert(
+      'notificationLevel',
+      (v) => $enumDecode(
+        _$GetRoomResponseObjectParticipantNotificationLevelEnumMap,
+        v,
+        unknownValue:
+            GetRoomResponseObjectParticipantNotificationLevel.defaultLevel,
+      ),
+    ),
+    $checkedConvert('unreadMessages', (v) => (v as num).toInt()),
+    $checkedConvert('unreadMention', (v) => v as bool),
+    $checkedConvert('unreadMentionDirect', (v) => v as bool),
+    $checkedConvert('lastReadMessage', (v) => (v as num).toInt()),
+    $checkedConvert('lastCommonReadMessage', (v) => (v as num).toInt()),
+    $checkedConvert(
+      'lastMessage',
+      (v) => v == null
+          ? null
+          : GetChatResponseObject.fromJson(v as Map<String, dynamic>),
+    ),
+    $checkedConvert('status', (v) => v as String?),
+    $checkedConvert('statusIcon', (v) => v as String?),
+    $checkedConvert('statusMessage', (v) => v as String?),
+  );
+  return val;
+});
 
 Map<String, dynamic> _$GetRoomResponseObjectToJson(
   GetRoomResponseObject instance,
@@ -93,7 +115,7 @@ Map<String, dynamic> _$GetRoomResponseObjectToJson(
   'unreadMentionDirect': instance.unreadMentionDirect,
   'lastReadMessage': instance.lastReadMessage,
   'lastCommonReadMessage': instance.lastCommonReadMessage,
-  'lastMessage': instance.lastMessage.toJson(),
+  'lastMessage': instance.lastMessage?.toJson(),
   'status': instance.status,
   'statusIcon': instance.statusIcon,
   'statusMessage': instance.statusMessage,
@@ -106,6 +128,7 @@ const _$GetRoomResponseObjectConversationTypeEnumMap = {
   GetRoomResponseObjectConversationType.changelog: 4,
   GetRoomResponseObjectConversationType.deleted: 5,
   GetRoomResponseObjectConversationType.noteToSelf: 6,
+  GetRoomResponseObjectConversationType.unknown: 'unknown',
 };
 
 const _$GetRoomResponseObjectParticipantNotificationLevelEnumMap = {