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/timetable_favorites_settings.g.dart

@@ -8,11 +8,17 @@ part of 'timetable_favorites_settings.dart';
 
 FavoriteTimetableElement _$FavoriteTimetableElementFromJson(
   Map<String, dynamic> json,
-) => FavoriteTimetableElement(
-  type: $enumDecode(_$TimetableElementTypeEnumMap, json['type']),
-  id: (json['id'] as num).toInt(),
-  label: json['label'] as String,
-);
+) => $checkedCreate('FavoriteTimetableElement', json, ($checkedConvert) {
+  final val = FavoriteTimetableElement(
+    type: $checkedConvert(
+      'type',
+      (v) => $enumDecode(_$TimetableElementTypeEnumMap, v),
+    ),
+    id: $checkedConvert('id', (v) => (v as num).toInt()),
+    label: $checkedConvert('label', (v) => v as String),
+  );
+  return val;
+});
 
 Map<String, dynamic> _$FavoriteTimetableElementToJson(
   FavoriteTimetableElement instance,
@@ -31,11 +37,19 @@ const _$TimetableElementTypeEnumMap = {
 
 TimetableFavoritesSettings _$TimetableFavoritesSettingsFromJson(
   Map<String, dynamic> json,
-) => TimetableFavoritesSettings(
-  favorites: (json['favorites'] as List<dynamic>)
-      .map((e) => FavoriteTimetableElement.fromJson(e as Map<String, dynamic>))
-      .toList(),
-);
+) => $checkedCreate('TimetableFavoritesSettings', json, ($checkedConvert) {
+  final val = TimetableFavoritesSettings(
+    favorites: $checkedConvert(
+      'favorites',
+      (v) => (v as List<dynamic>)
+          .map(
+            (e) => FavoriteTimetableElement.fromJson(e as Map<String, dynamic>),
+          )
+          .toList(),
+    ),
+  );
+  return val;
+});
 
 Map<String, dynamic> _$TimetableFavoritesSettingsToJson(
   TimetableFavoritesSettings instance,