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/state/app/modules/nextcloud_capabilities/bloc/nextcloud_capabilities_state.g.dart

@@ -8,24 +8,56 @@ part of 'nextcloud_capabilities_state.dart';
 
 _NextcloudCapabilitiesState _$NextcloudCapabilitiesStateFromJson(
   Map<String, dynamic> json,
-) => _NextcloudCapabilitiesState(
-  apiEnabled: json['apiEnabled'] as bool? ?? false,
-  publicEnabled: json['publicEnabled'] as bool? ?? false,
-  publicMultipleLinks: json['publicMultipleLinks'] as bool? ?? false,
-  publicUploadEnabled: json['publicUploadEnabled'] as bool? ?? false,
-  publicPasswordEnforced: json['publicPasswordEnforced'] as bool? ?? false,
-  publicExpireEnabled: json['publicExpireEnabled'] as bool? ?? false,
-  publicExpireDays: (json['publicExpireDays'] as num?)?.toInt(),
-  publicExpireEnforced: json['publicExpireEnforced'] as bool? ?? false,
-  groupEnabled: json['groupEnabled'] as bool? ?? false,
-  resharing: json['resharing'] as bool? ?? false,
-  passwordMinLength: (json['passwordMinLength'] as num?)?.toInt(),
-  passwordEnforceUpperLower:
-      json['passwordEnforceUpperLower'] as bool? ?? false,
-  passwordEnforceNumeric: json['passwordEnforceNumeric'] as bool? ?? false,
-  passwordEnforceSpecial: json['passwordEnforceSpecial'] as bool? ?? false,
-  loaded: json['loaded'] as bool? ?? false,
-);
+) => $checkedCreate('_NextcloudCapabilitiesState', json, ($checkedConvert) {
+  final val = _NextcloudCapabilitiesState(
+    apiEnabled: $checkedConvert('apiEnabled', (v) => v as bool? ?? false),
+    publicEnabled: $checkedConvert('publicEnabled', (v) => v as bool? ?? false),
+    publicMultipleLinks: $checkedConvert(
+      'publicMultipleLinks',
+      (v) => v as bool? ?? false,
+    ),
+    publicUploadEnabled: $checkedConvert(
+      'publicUploadEnabled',
+      (v) => v as bool? ?? false,
+    ),
+    publicPasswordEnforced: $checkedConvert(
+      'publicPasswordEnforced',
+      (v) => v as bool? ?? false,
+    ),
+    publicExpireEnabled: $checkedConvert(
+      'publicExpireEnabled',
+      (v) => v as bool? ?? false,
+    ),
+    publicExpireDays: $checkedConvert(
+      'publicExpireDays',
+      (v) => (v as num?)?.toInt(),
+    ),
+    publicExpireEnforced: $checkedConvert(
+      'publicExpireEnforced',
+      (v) => v as bool? ?? false,
+    ),
+    groupEnabled: $checkedConvert('groupEnabled', (v) => v as bool? ?? false),
+    resharing: $checkedConvert('resharing', (v) => v as bool? ?? false),
+    passwordMinLength: $checkedConvert(
+      'passwordMinLength',
+      (v) => (v as num?)?.toInt(),
+    ),
+    passwordEnforceUpperLower: $checkedConvert(
+      'passwordEnforceUpperLower',
+      (v) => v as bool? ?? false,
+    ),
+    passwordEnforceNumeric: $checkedConvert(
+      'passwordEnforceNumeric',
+      (v) => v as bool? ?? false,
+    ),
+    passwordEnforceSpecial: $checkedConvert(
+      'passwordEnforceSpecial',
+      (v) => v as bool? ?? false,
+    ),
+    loaded: $checkedConvert('loaded', (v) => v as bool? ?? false),
+  );
+  return val;
+});
 
 Map<String, dynamic> _$NextcloudCapabilitiesStateToJson(
   _NextcloudCapabilitiesState instance,