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/marianum_message/bloc/marianum_message_state.g.dart

@@ -8,36 +8,49 @@ part of 'marianum_message_state.dart';
 
 _MarianumMessageState _$MarianumMessageStateFromJson(
   Map<String, dynamic> json,
-) => _MarianumMessageState(
-  messageList: MarianumMessageList.fromJson(
-    json['messageList'] as Map<String, dynamic>,
-  ),
-);
+) => $checkedCreate('_MarianumMessageState', json, ($checkedConvert) {
+  final val = _MarianumMessageState(
+    messageList: $checkedConvert(
+      'messageList',
+      (v) => MarianumMessageList.fromJson(v as Map<String, dynamic>),
+    ),
+  );
+  return val;
+});
 
 Map<String, dynamic> _$MarianumMessageStateToJson(
   _MarianumMessageState instance,
 ) => <String, dynamic>{'messageList': instance.messageList};
 
 _MarianumMessageList _$MarianumMessageListFromJson(Map<String, dynamic> json) =>
-    _MarianumMessageList(
-      base: json['base'] as String,
-      messages: (json['messages'] as List<dynamic>)
-          .map((e) => MarianumMessage.fromJson(e as Map<String, dynamic>))
-          .toList(),
-    );
+    $checkedCreate('_MarianumMessageList', json, ($checkedConvert) {
+      final val = _MarianumMessageList(
+        base: $checkedConvert('base', (v) => v as String),
+        messages: $checkedConvert(
+          'messages',
+          (v) => (v as List<dynamic>)
+              .map((e) => MarianumMessage.fromJson(e as Map<String, dynamic>))
+              .toList(),
+        ),
+      );
+      return val;
+    });
 
 Map<String, dynamic> _$MarianumMessageListToJson(
   _MarianumMessageList instance,
 ) => <String, dynamic>{'base': instance.base, 'messages': instance.messages};
 
 _MarianumMessage _$MarianumMessageFromJson(Map<String, dynamic> json) =>
-    _MarianumMessage(
-      id: json['id'] as String? ?? '',
-      name: json['name'] as String,
-      date: json['date'] as String,
-      description: json['description'] as String? ?? '',
-      url: json['url'] as String,
-    );
+    $checkedCreate('_MarianumMessage', json, ($checkedConvert) {
+      final val = _MarianumMessage(
+        id: $checkedConvert('id', (v) => v as String? ?? ''),
+        name: $checkedConvert('name', (v) => v as String),
+        date: $checkedConvert('date', (v) => v as String),
+        description: $checkedConvert('description', (v) => v as String? ?? ''),
+        url: $checkedConvert('url', (v) => v as String),
+      );
+      return val;
+    });
 
 Map<String, dynamic> _$MarianumMessageToJson(_MarianumMessage instance) =>
     <String, dynamic>{