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/webdav/queries/list_files/cacheable_file.g.dart

@@ -7,23 +7,28 @@ part of 'cacheable_file.dart';
 // **************************************************************************
 
 CacheableFile _$CacheableFileFromJson(Map<String, dynamic> json) =>
-    CacheableFile(
-      path: json['path'] as String,
-      isDirectory: json['isDirectory'] as bool,
-      name: json['name'] as String,
-      mimeType: json['mimeType'] as String?,
-      size: (json['size'] as num?)?.toInt(),
-      eTag: json['eTag'] as String?,
-      createdAt: json['createdAt'] == null
-          ? null
-          : DateTime.parse(json['createdAt'] as String),
-      modifiedAt: json['modifiedAt'] == null
-          ? null
-          : DateTime.parse(json['modifiedAt'] as String),
-      fileId: (json['fileId'] as num?)?.toInt(),
-      hasPreview: json['hasPreview'] as bool?,
-      isSharedWithMe: json['isSharedWithMe'] as bool?,
-    );
+    $checkedCreate('CacheableFile', json, ($checkedConvert) {
+      final val = CacheableFile(
+        path: $checkedConvert('path', (v) => v as String),
+        isDirectory: $checkedConvert('isDirectory', (v) => v as bool),
+        name: $checkedConvert('name', (v) => v as String),
+        mimeType: $checkedConvert('mimeType', (v) => v as String?),
+        size: $checkedConvert('size', (v) => (v as num?)?.toInt()),
+        eTag: $checkedConvert('eTag', (v) => v as String?),
+        createdAt: $checkedConvert(
+          'createdAt',
+          (v) => v == null ? null : DateTime.parse(v as String),
+        ),
+        modifiedAt: $checkedConvert(
+          'modifiedAt',
+          (v) => v == null ? null : DateTime.parse(v as String),
+        ),
+        fileId: $checkedConvert('fileId', (v) => (v as num?)?.toInt()),
+        hasPreview: $checkedConvert('hasPreview', (v) => v as bool?),
+        isSharedWithMe: $checkedConvert('isSharedWithMe', (v) => v as bool?),
+      );
+      return val;
+    });
 
 Map<String, dynamic> _$CacheableFileToJson(CacheableFile instance) =>
     <String, dynamic>{

lib/api/marianumcloud/webdav/queries/list_files/list_files_params.g.dart

@@ -7,7 +7,10 @@ part of 'list_files_params.dart';
 // **************************************************************************
 
 ListFilesParams _$ListFilesParamsFromJson(Map<String, dynamic> json) =>
-    ListFilesParams(json['path'] as String);
+    $checkedCreate('ListFilesParams', json, ($checkedConvert) {
+      final val = ListFilesParams($checkedConvert('path', (v) => v as String));
+      return val;
+    });
 
 Map<String, dynamic> _$ListFilesParamsToJson(ListFilesParams instance) =>
     <String, dynamic>{'path': instance.path};

lib/api/marianumcloud/webdav/queries/list_files/list_files_response.g.dart

@@ -7,14 +7,23 @@ part of 'list_files_response.dart';
 // **************************************************************************
 
 ListFilesResponse _$ListFilesResponseFromJson(Map<String, dynamic> json) =>
-    ListFilesResponse(
-        (json['files'] as List<dynamic>)
-            .map((e) => CacheableFile.fromJson(e as Map<String, dynamic>))
-            .toSet(),
-      )
-      ..headers = (json['headers'] as Map<String, dynamic>?)?.map(
-        (k, e) => MapEntry(k, e as String),
+    $checkedCreate('ListFilesResponse', json, ($checkedConvert) {
+      final val = ListFilesResponse(
+        $checkedConvert(
+          'files',
+          (v) => (v as List<dynamic>)
+              .map((e) => CacheableFile.fromJson(e as Map<String, dynamic>))
+              .toSet(),
+        ),
       );
+      $checkedConvert(
+        'headers',
+        (v) => val.headers = (v as Map<String, dynamic>?)?.map(
+          (k, e) => MapEntry(k, e as String),
+        ),
+      );
+      return val;
+    });
 
 Map<String, dynamic> _$ListFilesResponseToJson(ListFilesResponse instance) =>
     <String, dynamic>{