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/marianum_dates/bloc/marianum_dates_state.g.dart

@@ -7,12 +7,18 @@ part of 'marianum_dates_state.dart';
 // **************************************************************************
 
 _MarianumDatesState _$MarianumDatesStateFromJson(Map<String, dynamic> json) =>
-    _MarianumDatesState(
-      showPastEvents: json['showPastEvents'] as bool,
-      events: (json['events'] as List<dynamic>)
-          .map((e) => MarianumDate.fromJson(e as Map<String, dynamic>))
-          .toList(),
-    );
+    $checkedCreate('_MarianumDatesState', json, ($checkedConvert) {
+      final val = _MarianumDatesState(
+        showPastEvents: $checkedConvert('showPastEvents', (v) => v as bool),
+        events: $checkedConvert(
+          'events',
+          (v) => (v as List<dynamic>)
+              .map((e) => MarianumDate.fromJson(e as Map<String, dynamic>))
+              .toList(),
+        ),
+      );
+      return val;
+    });
 
 Map<String, dynamic> _$MarianumDatesStateToJson(_MarianumDatesState instance) =>
     <String, dynamic>{
@@ -21,14 +27,17 @@ Map<String, dynamic> _$MarianumDatesStateToJson(_MarianumDatesState instance) =>
     };
 
 _MarianumDate _$MarianumDateFromJson(Map<String, dynamic> json) =>
-    _MarianumDate(
-      uid: json['uid'] as String,
-      title: json['title'] as String,
-      description: json['description'] as String?,
-      start: DateTime.parse(json['start'] as String),
-      end: DateTime.parse(json['end'] as String),
-      isAllDay: json['isAllDay'] as bool,
-    );
+    $checkedCreate('_MarianumDate', json, ($checkedConvert) {
+      final val = _MarianumDate(
+        uid: $checkedConvert('uid', (v) => v as String),
+        title: $checkedConvert('title', (v) => v as String),
+        description: $checkedConvert('description', (v) => v as String?),
+        start: $checkedConvert('start', (v) => DateTime.parse(v as String)),
+        end: $checkedConvert('end', (v) => DateTime.parse(v as String)),
+        isAllDay: $checkedConvert('isAllDay', (v) => v as bool),
+      );
+      return val;
+    });
 
 Map<String, dynamic> _$MarianumDateToJson(_MarianumDate instance) =>
     <String, dynamic>{