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/chat/get_chat_params.g.dart

@@ -7,24 +7,33 @@ part of 'get_chat_params.dart';
 // **************************************************************************
 
 GetChatParams _$GetChatParamsFromJson(Map<String, dynamic> json) =>
-    GetChatParams(
-      lookIntoFuture: $enumDecode(
-        _$GetChatParamsSwitchEnumMap,
-        json['lookIntoFuture'],
-      ),
-      limit: (json['limit'] as num?)?.toInt(),
-      lastKnownMessageId: (json['lastKnownMessageId'] as num?)?.toInt(),
-      lastCommonReadId: (json['lastCommonReadId'] as num?)?.toInt(),
-      timeout: (json['timeout'] as num?)?.toInt(),
-      setReadMarker: $enumDecodeNullable(
-        _$GetChatParamsSwitchEnumMap,
-        json['setReadMarker'],
-      ),
-      includeLastKnown: $enumDecodeNullable(
-        _$GetChatParamsSwitchEnumMap,
-        json['includeLastKnown'],
-      ),
-    );
+    $checkedCreate('GetChatParams', json, ($checkedConvert) {
+      final val = GetChatParams(
+        lookIntoFuture: $checkedConvert(
+          'lookIntoFuture',
+          (v) => $enumDecode(_$GetChatParamsSwitchEnumMap, v),
+        ),
+        limit: $checkedConvert('limit', (v) => (v as num?)?.toInt()),
+        lastKnownMessageId: $checkedConvert(
+          'lastKnownMessageId',
+          (v) => (v as num?)?.toInt(),
+        ),
+        lastCommonReadId: $checkedConvert(
+          'lastCommonReadId',
+          (v) => (v as num?)?.toInt(),
+        ),
+        timeout: $checkedConvert('timeout', (v) => (v as num?)?.toInt()),
+        setReadMarker: $checkedConvert(
+          'setReadMarker',
+          (v) => $enumDecodeNullable(_$GetChatParamsSwitchEnumMap, v),
+        ),
+        includeLastKnown: $checkedConvert(
+          'includeLastKnown',
+          (v) => $enumDecodeNullable(_$GetChatParamsSwitchEnumMap, v),
+        ),
+      );
+      return val;
+    });
 
 Map<String, dynamic> _$GetChatParamsToJson(
   GetChatParams instance,