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/state/app/modules/chat/bloc/chat_bloc.dart

@@ -411,6 +411,7 @@ class ChatBloc
         case GetRoomResponseObjectMessageType.deletedComment:
         case GetRoomResponseObjectMessageType.system:
         case GetRoomResponseObjectMessageType.command:
+        case GetRoomResponseObjectMessageType.unknown:
           break;
       }
     }

lib/state/app/modules/chat/bloc/chat_state.g.dart

@@ -6,14 +6,30 @@ part of 'chat_state.dart';
 // JsonSerializableGenerator
 // **************************************************************************
 
-_ChatState _$ChatStateFromJson(Map<String, dynamic> json) => _ChatState(
-  currentToken: json['currentToken'] as String? ?? '',
-  chatResponse: json['chatResponse'] == null
-      ? null
-      : GetChatResponse.fromJson(json['chatResponse'] as Map<String, dynamic>),
-  referenceMessageId: (json['referenceMessageId'] as num?)?.toInt(),
-  hasMoreOld: json['hasMoreOld'] as bool? ?? true,
-  isLoadingOlder: json['isLoadingOlder'] as bool? ?? false,
+_ChatState _$ChatStateFromJson(Map<String, dynamic> json) => $checkedCreate(
+  '_ChatState',
+  json,
+  ($checkedConvert) {
+    final val = _ChatState(
+      currentToken: $checkedConvert('currentToken', (v) => v as String? ?? ''),
+      chatResponse: $checkedConvert(
+        'chatResponse',
+        (v) => v == null
+            ? null
+            : GetChatResponse.fromJson(v as Map<String, dynamic>),
+      ),
+      referenceMessageId: $checkedConvert(
+        'referenceMessageId',
+        (v) => (v as num?)?.toInt(),
+      ),
+      hasMoreOld: $checkedConvert('hasMoreOld', (v) => v as bool? ?? true),
+      isLoadingOlder: $checkedConvert(
+        'isLoadingOlder',
+        (v) => v as bool? ?? false,
+      ),
+    );
+    return val;
+  },
 );
 
 Map<String, dynamic> _$ChatStateToJson(_ChatState instance) =>