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/search/search_files_response.g.dart

@@ -7,14 +7,20 @@ part of 'search_files_response.dart';
 // **************************************************************************
 
 SearchFilesResponse _$SearchFilesResponseFromJson(Map<String, dynamic> json) =>
-    SearchFilesResponse(
-      name: json['name'] as String,
-      isPaginated: json['isPaginated'] as bool,
-      cursor: (json['cursor'] as num?)?.toInt(),
-      entries: (json['entries'] as List<dynamic>)
-          .map((e) => SearchFilesEntry.fromJson(e as Map<String, dynamic>))
-          .toList(),
-    );
+    $checkedCreate('SearchFilesResponse', json, ($checkedConvert) {
+      final val = SearchFilesResponse(
+        name: $checkedConvert('name', (v) => v as String),
+        isPaginated: $checkedConvert('isPaginated', (v) => v as bool),
+        cursor: $checkedConvert('cursor', (v) => (v as num?)?.toInt()),
+        entries: $checkedConvert(
+          'entries',
+          (v) => (v as List<dynamic>)
+              .map((e) => SearchFilesEntry.fromJson(e as Map<String, dynamic>))
+              .toList(),
+        ),
+      );
+      return val;
+    });
 
 Map<String, dynamic> _$SearchFilesResponseToJson(
   SearchFilesResponse instance,
@@ -26,13 +32,19 @@ Map<String, dynamic> _$SearchFilesResponseToJson(
 };
 
 SearchFilesEntry _$SearchFilesEntryFromJson(Map<String, dynamic> json) =>
-    SearchFilesEntry(
-      title: json['title'] as String,
-      subline: json['subline'] as String?,
-      icon: json['icon'] as String?,
-      resourceUrl: json['resourceUrl'] as String?,
-      attributes: json['attributes'] as Map<String, dynamic>?,
-    );
+    $checkedCreate('SearchFilesEntry', json, ($checkedConvert) {
+      final val = SearchFilesEntry(
+        title: $checkedConvert('title', (v) => v as String),
+        subline: $checkedConvert('subline', (v) => v as String?),
+        icon: $checkedConvert('icon', (v) => v as String?),
+        resourceUrl: $checkedConvert('resourceUrl', (v) => v as String?),
+        attributes: $checkedConvert(
+          'attributes',
+          (v) => v as Map<String, dynamic>?,
+        ),
+      );
+      return val;
+    });
 
 Map<String, dynamic> _$SearchFilesEntryToJson(SearchFilesEntry instance) =>
     <String, dynamic>{