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_list/bloc/chat_list_bloc.dart

@@ -187,16 +187,18 @@ class ChatListBloc
   /// Clears unread too — long-poll only feeds this in for an actively-open chat.
   void applyIncomingMessage(String token, GetChatResponseObject message) {
     _mutateRoom(token, (r) {
-      final wasRead =
-          r.unreadMessages == 0 && r.lastReadMessage >= message.id;
-      final hasNewer = r.lastMessage.id >= message.id;
+      final wasRead = r.unreadMessages == 0 && r.lastReadMessage >= message.id;
+      final lastId = r.lastMessage?.id ?? 0;
+      final hasNewer = lastId >= message.id;
       if (wasRead && hasNewer) return false;
       r.unreadMessages = 0;
       r.unreadMention = false;
       r.unreadMentionDirect = false;
       if (message.id > r.lastReadMessage) r.lastReadMessage = message.id;
-      if (message.id > r.lastMessage.id) r.lastMessage = message;
-      if (message.timestamp > r.lastActivity) r.lastActivity = message.timestamp;
+      if (message.id > lastId) r.lastMessage = message;
+      if (message.timestamp > r.lastActivity) {
+        r.lastActivity = message.timestamp;
+      }
       return true;
     });
   }

lib/state/app/modules/chat_list/bloc/chat_list_state.g.dart

@@ -7,11 +7,17 @@ part of 'chat_list_state.dart';
 // **************************************************************************
 
 _ChatListState _$ChatListStateFromJson(Map<String, dynamic> json) =>
-    _ChatListState(
-      rooms: json['rooms'] == null
-          ? null
-          : GetRoomResponse.fromJson(json['rooms'] as Map<String, dynamic>),
-    );
+    $checkedCreate('_ChatListState', json, ($checkedConvert) {
+      final val = _ChatListState(
+        rooms: $checkedConvert(
+          'rooms',
+          (v) => v == null
+              ? null
+              : GetRoomResponse.fromJson(v as Map<String, dynamic>),
+        ),
+      );
+      return val;
+    });
 
 Map<String, dynamic> _$ChatListStateToJson(_ChatListState instance) =>
     <String, dynamic>{'rooms': instance.rooms};