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/storage/modules_settings.g.dart

@@ -7,17 +7,35 @@ part of 'modules_settings.dart';
 // **************************************************************************
 
 ModulesSettings _$ModulesSettingsFromJson(Map<String, dynamic> json) =>
-    ModulesSettings(
-      moduleOrder: (json['moduleOrder'] as List<dynamic>)
-          .map((e) => $enumDecode(_$ModulesEnumMap, e))
-          .toList(),
-      hiddenModules: (json['hiddenModules'] as List<dynamic>)
-          .map((e) => $enumDecode(_$ModulesEnumMap, e))
-          .toList(),
-      autoFillBottomBar: json['autoFillBottomBar'] as bool? ?? true,
-      fixedBottomBarSlots: (json['fixedBottomBarSlots'] as num?)?.toInt() ?? 3,
-      teacherDefaultsApplied: json['teacherDefaultsApplied'] as bool? ?? false,
-    );
+    $checkedCreate('ModulesSettings', json, ($checkedConvert) {
+      final val = ModulesSettings(
+        moduleOrder: $checkedConvert(
+          'moduleOrder',
+          (v) => (v as List<dynamic>)
+              .map((e) => $enumDecode(_$ModulesEnumMap, e))
+              .toList(),
+        ),
+        hiddenModules: $checkedConvert(
+          'hiddenModules',
+          (v) => (v as List<dynamic>)
+              .map((e) => $enumDecode(_$ModulesEnumMap, e))
+              .toList(),
+        ),
+        autoFillBottomBar: $checkedConvert(
+          'autoFillBottomBar',
+          (v) => v as bool? ?? true,
+        ),
+        fixedBottomBarSlots: $checkedConvert(
+          'fixedBottomBarSlots',
+          (v) => (v as num?)?.toInt() ?? 3,
+        ),
+        teacherDefaultsApplied: $checkedConvert(
+          'teacherDefaultsApplied',
+          (v) => v as bool? ?? false,
+        ),
+      );
+      return val;
+    });
 
 Map<String, dynamic> _$ModulesSettingsToJson(
   ModulesSettings instance,