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/dev_tools_settings.g.dart

@@ -7,23 +7,49 @@ part of 'dev_tools_settings.dart';
 // **************************************************************************
 
 DevToolsSettings _$DevToolsSettingsFromJson(Map<String, dynamic> json) =>
-    DevToolsSettings(
-      showPerformanceOverlay: json['showPerformanceOverlay'] as bool,
-      showFrameStats: json['showFrameStats'] as bool? ?? false,
-      showMemoryStats: json['showMemoryStats'] as bool? ?? false,
-      showSemanticsDebugger: json['showSemanticsDebugger'] as bool? ?? false,
-      slowAnimations: json['slowAnimations'] as bool? ?? false,
-      textScaleOverride: (json['textScaleOverride'] as num?)?.toDouble() ?? 0,
-      marianumConnectEndpoint:
-          $enumDecodeNullable(
-            _$MarianumConnectEndpointEnumMap,
-            json['marianumConnectEndpoint'],
-          ) ??
-          MarianumConnectEndpoint.live,
-      marianumConnectCustomUrl:
-          json['marianumConnectCustomUrl'] as String? ?? '',
-      emergencyNoticeUrl: json['emergencyNoticeUrl'] as String? ?? '',
-    );
+    $checkedCreate('DevToolsSettings', json, ($checkedConvert) {
+      final val = DevToolsSettings(
+        showPerformanceOverlay: $checkedConvert(
+          'showPerformanceOverlay',
+          (v) => v as bool,
+        ),
+        showFrameStats: $checkedConvert(
+          'showFrameStats',
+          (v) => v as bool? ?? false,
+        ),
+        showMemoryStats: $checkedConvert(
+          'showMemoryStats',
+          (v) => v as bool? ?? false,
+        ),
+        showSemanticsDebugger: $checkedConvert(
+          'showSemanticsDebugger',
+          (v) => v as bool? ?? false,
+        ),
+        slowAnimations: $checkedConvert(
+          'slowAnimations',
+          (v) => v as bool? ?? false,
+        ),
+        textScaleOverride: $checkedConvert(
+          'textScaleOverride',
+          (v) => (v as num?)?.toDouble() ?? 0,
+        ),
+        marianumConnectEndpoint: $checkedConvert(
+          'marianumConnectEndpoint',
+          (v) =>
+              $enumDecodeNullable(_$MarianumConnectEndpointEnumMap, v) ??
+              MarianumConnectEndpoint.live,
+        ),
+        marianumConnectCustomUrl: $checkedConvert(
+          'marianumConnectCustomUrl',
+          (v) => v as String? ?? '',
+        ),
+        emergencyNoticeUrl: $checkedConvert(
+          'emergencyNoticeUrl',
+          (v) => v as String? ?? '',
+        ),
+      );
+      return val;
+    });
 
 Map<String, dynamic> _$DevToolsSettingsToJson(DevToolsSettings instance) =>
     <String, dynamic>{