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/storage/notification_settings.g.dart

@@ -8,11 +8,16 @@ part of 'notification_settings.dart';
 
 NotificationSettings _$NotificationSettingsFromJson(
   Map<String, dynamic> json,
-) => NotificationSettings(
-  enabled: json['enabled'] as bool? ?? true,
-  talkPermissionPromptShown:
-      json['talkPermissionPromptShown'] as bool? ?? false,
-);
+) => $checkedCreate('NotificationSettings', json, ($checkedConvert) {
+  final val = NotificationSettings(
+    enabled: $checkedConvert('enabled', (v) => v as bool? ?? true),
+    talkPermissionPromptShown: $checkedConvert(
+      'talkPermissionPromptShown',
+      (v) => v as bool? ?? false,
+    ),
+  );
+  return val;
+});
 
 Map<String, dynamic> _$NotificationSettingsToJson(
   NotificationSettings instance,