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/api/marianumcloud/talk/get_poll/get_poll_state_response.g.dart

@@ -8,15 +8,21 @@ part of 'get_poll_state_response.dart';
 
 GetPollStateResponse _$GetPollStateResponseFromJson(
   Map<String, dynamic> json,
-) =>
-    GetPollStateResponse(
-        GetPollStateResponseObject.fromJson(
-          json['data'] as Map<String, dynamic>,
-        ),
-      )
-      ..headers = (json['headers'] as Map<String, dynamic>?)?.map(
-        (k, e) => MapEntry(k, e as String),
-      );
+) => $checkedCreate('GetPollStateResponse', json, ($checkedConvert) {
+  final val = GetPollStateResponse(
+    $checkedConvert(
+      'data',
+      (v) => GetPollStateResponseObject.fromJson(v as Map<String, dynamic>),
+    ),
+  );
+  $checkedConvert(
+    'headers',
+    (v) => val.headers = (v as Map<String, dynamic>?)?.map(
+      (k, e) => MapEntry(k, e as String),
+    ),
+  );
+  return val;
+});
 
 Map<String, dynamic> _$GetPollStateResponseToJson(
   GetPollStateResponse instance,
@@ -27,21 +33,30 @@ Map<String, dynamic> _$GetPollStateResponseToJson(
 
 GetPollStateResponseObject _$GetPollStateResponseObjectFromJson(
   Map<String, dynamic> json,
-) => GetPollStateResponseObject(
-  (json['id'] as num).toInt(),
-  json['question'] as String,
-  (json['options'] as List<dynamic>).map((e) => e as String).toList(),
-  json['votes'],
-  json['actorType'] as String,
-  json['actorId'] as String,
-  json['actorDisplayName'] as String,
-  (json['status'] as num).toInt(),
-  (json['resultMode'] as num).toInt(),
-  (json['maxVotes'] as num).toInt(),
-  (json['votedSelf'] as List<dynamic>).map((e) => (e as num).toInt()).toList(),
-  (json['numVoters'] as num?)?.toInt(),
-  json['details'] as List<dynamic>?,
-);
+) => $checkedCreate('GetPollStateResponseObject', json, ($checkedConvert) {
+  final val = GetPollStateResponseObject(
+    $checkedConvert('id', (v) => (v as num).toInt()),
+    $checkedConvert('question', (v) => v as String),
+    $checkedConvert(
+      'options',
+      (v) => (v as List<dynamic>).map((e) => e as String).toList(),
+    ),
+    $checkedConvert('votes', (v) => v),
+    $checkedConvert('actorType', (v) => v as String),
+    $checkedConvert('actorId', (v) => v as String),
+    $checkedConvert('actorDisplayName', (v) => v as String),
+    $checkedConvert('status', (v) => (v as num).toInt()),
+    $checkedConvert('resultMode', (v) => (v as num).toInt()),
+    $checkedConvert('maxVotes', (v) => (v as num).toInt()),
+    $checkedConvert(
+      'votedSelf',
+      (v) => (v as List<dynamic>).map((e) => (e as num).toInt()).toList(),
+    ),
+    $checkedConvert('numVoters', (v) => (v as num?)?.toInt()),
+    $checkedConvert('details', (v) => v as List<dynamic>?),
+  );
+  return val;
+});
 
 Map<String, dynamic> _$GetPollStateResponseObjectToJson(
   GetPollStateResponseObject instance,