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_reactions/get_reactions_response.dart

@@ -17,6 +17,7 @@ class GetReactionsResponse extends ApiResponse {
 
 @JsonSerializable()
 class GetReactionsResponseObject {
+  @JsonKey(unknownEnumValue: GetReactionsResponseObjectActorType.unknown)
   GetReactionsResponseObjectActorType actorType;
   String actorId;
   String actorDisplayName;
@@ -39,4 +40,11 @@ enum GetReactionsResponseObjectActorType {
   guests,
   @JsonValue('users')
   users,
+  @JsonValue('emails')
+  emails,
+  @JsonValue('bots')
+  bots,
+  @JsonValue('federated_users')
+  federatedUsers,
+  unknown,
 }

lib/api/marianumcloud/talk/get_reactions/get_reactions_response.g.dart

@@ -8,24 +8,32 @@ part of 'get_reactions_response.dart';
 
 GetReactionsResponse _$GetReactionsResponseFromJson(
   Map<String, dynamic> json,
-) =>
-    GetReactionsResponse(
-        (json['data'] as Map<String, dynamic>).map(
-          (k, e) => MapEntry(
-            k,
-            (e as List<dynamic>)
-                .map(
-                  (e) => GetReactionsResponseObject.fromJson(
-                    e as Map<String, dynamic>,
-                  ),
-                )
-                .toList(),
-          ),
+) => $checkedCreate('GetReactionsResponse', json, ($checkedConvert) {
+  final val = GetReactionsResponse(
+    $checkedConvert(
+      'data',
+      (v) => (v as Map<String, dynamic>).map(
+        (k, e) => MapEntry(
+          k,
+          (e as List<dynamic>)
+              .map(
+                (e) => GetReactionsResponseObject.fromJson(
+                  e as Map<String, dynamic>,
+                ),
+              )
+              .toList(),
         ),
-      )
-      ..headers = (json['headers'] as Map<String, dynamic>?)?.map(
-        (k, e) => MapEntry(k, e as String),
-      );
+      ),
+    ),
+  );
+  $checkedConvert(
+    'headers',
+    (v) => val.headers = (v as Map<String, dynamic>?)?.map(
+      (k, e) => MapEntry(k, e as String),
+    ),
+  );
+  return val;
+});
 
 Map<String, dynamic> _$GetReactionsResponseToJson(
   GetReactionsResponse instance,
@@ -38,12 +46,22 @@ Map<String, dynamic> _$GetReactionsResponseToJson(
 
 GetReactionsResponseObject _$GetReactionsResponseObjectFromJson(
   Map<String, dynamic> json,
-) => GetReactionsResponseObject(
-  $enumDecode(_$GetReactionsResponseObjectActorTypeEnumMap, json['actorType']),
-  json['actorId'] as String,
-  json['actorDisplayName'] as String,
-  (json['timestamp'] as num).toInt(),
-);
+) => $checkedCreate('GetReactionsResponseObject', json, ($checkedConvert) {
+  final val = GetReactionsResponseObject(
+    $checkedConvert(
+      'actorType',
+      (v) => $enumDecode(
+        _$GetReactionsResponseObjectActorTypeEnumMap,
+        v,
+        unknownValue: GetReactionsResponseObjectActorType.unknown,
+      ),
+    ),
+    $checkedConvert('actorId', (v) => v as String),
+    $checkedConvert('actorDisplayName', (v) => v as String),
+    $checkedConvert('timestamp', (v) => (v as num).toInt()),
+  );
+  return val;
+});
 
 Map<String, dynamic> _$GetReactionsResponseObjectToJson(
   GetReactionsResponseObject instance,
@@ -58,4 +76,8 @@ Map<String, dynamic> _$GetReactionsResponseObjectToJson(
 const _$GetReactionsResponseObjectActorTypeEnumMap = {
   GetReactionsResponseObjectActorType.guests: 'guests',
   GetReactionsResponseObjectActorType.users: 'users',
+  GetReactionsResponseObjectActorType.emails: 'emails',
+  GetReactionsResponseObjectActorType.bots: 'bots',
+  GetReactionsResponseObjectActorType.federatedUsers: 'federated_users',
+  GetReactionsResponseObjectActorType.unknown: 'unknown',
 };