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/marianumconnect/queries/get_breakers/get_breakers_response.dart

@@ -25,6 +25,7 @@ class GetBreakersResponse extends ApiResponse {
 
 @JsonSerializable()
 class BreakerRule {
+  @JsonKey(unknownEnumValue: BreakerArea.unknown)
   List<BreakerArea> areas;
   String message;
 
@@ -69,4 +70,7 @@ enum BreakerArea {
   feedback,
   @JsonValue('MORE')
   more,
+
+  /// An area the backend added after this build; no module maps to it.
+  unknown,
 }

lib/api/marianumconnect/queries/get_breakers/get_breakers_response.g.dart

@@ -7,15 +7,25 @@ part of 'get_breakers_response.dart';
 // **************************************************************************
 
 GetBreakersResponse _$GetBreakersResponseFromJson(Map<String, dynamic> json) =>
-    GetBreakersResponse(
-        (json['rules'] as List<dynamic>?)
-                ?.map((e) => BreakerRule.fromJson(e as Map<String, dynamic>))
-                .toList() ??
-            [],
-      )
-      ..headers = (json['headers'] as Map<String, dynamic>?)?.map(
-        (k, e) => MapEntry(k, e as String),
+    $checkedCreate('GetBreakersResponse', json, ($checkedConvert) {
+      final val = GetBreakersResponse(
+        $checkedConvert(
+          'rules',
+          (v) =>
+              (v as List<dynamic>?)
+                  ?.map((e) => BreakerRule.fromJson(e as Map<String, dynamic>))
+                  .toList() ??
+              [],
+        ),
       );
+      $checkedConvert(
+        'headers',
+        (v) => val.headers = (v as Map<String, dynamic>?)?.map(
+          (k, e) => MapEntry(k, e as String),
+        ),
+      );
+      return val;
+    });
 
 Map<String, dynamic> _$GetBreakersResponseToJson(
   GetBreakersResponse instance,
@@ -24,13 +34,26 @@ Map<String, dynamic> _$GetBreakersResponseToJson(
   'rules': instance.rules.map((e) => e.toJson()).toList(),
 };
 
-BreakerRule _$BreakerRuleFromJson(Map<String, dynamic> json) => BreakerRule(
-  (json['areas'] as List<dynamic>)
-      .map((e) => $enumDecode(_$BreakerAreaEnumMap, e))
-      .toList(),
-  json['message'] as String,
-  (json['maxBuild'] as num?)?.toInt(),
-);
+BreakerRule _$BreakerRuleFromJson(Map<String, dynamic> json) =>
+    $checkedCreate('BreakerRule', json, ($checkedConvert) {
+      final val = BreakerRule(
+        $checkedConvert(
+          'areas',
+          (v) => (v as List<dynamic>)
+              .map(
+                (e) => $enumDecode(
+                  _$BreakerAreaEnumMap,
+                  e,
+                  unknownValue: BreakerArea.unknown,
+                ),
+              )
+              .toList(),
+        ),
+        $checkedConvert('message', (v) => v as String),
+        $checkedConvert('maxBuild', (v) => (v as num?)?.toInt()),
+      );
+      return val;
+    });
 
 Map<String, dynamic> _$BreakerRuleToJson(BreakerRule instance) =>
     <String, dynamic>{
@@ -52,4 +75,5 @@ const _$BreakerAreaEnumMap = {
   BreakerArea.dates: 'DATES',
   BreakerArea.feedback: 'FEEDBACK',
   BreakerArea.more: 'MORE',
+  BreakerArea.unknown: 'unknown',
 };