claude refactorings, flutter best practices, platform dependent changes, general cleanup

lib/api/marianumcloud/talk/send_message/send_message.dart

@@ -0,0 +1,23 @@
+import 'package:http/http.dart' as http;
+import 'package:http/http.dart';
+
+import '../../../api_params.dart';
+import '../talk_api.dart';
+import 'send_message_params.dart';
+
+class SendMessage extends TalkApi {
+  String chatToken;
+  SendMessage(this.chatToken, SendMessageParams params) : super('v1/chat/$chatToken', params);
+
+  @override
+  Null assemble(String raw) => null;
+
+  @override
+  Future<Response>? request(Uri uri, ApiParams? body, Map<String, String>? headers) {
+    if(body is SendMessageParams) {
+      return http.post(uri, headers: headers, body: body.toJson());
+    }
+    return null;
+  }
+  
+}

lib/api/marianumcloud/talk/send_message/send_message_params.dart

@@ -0,0 +1,16 @@
+import 'package:json_annotation/json_annotation.dart';
+
+import '../../../api_params.dart';
+
+part 'send_message_params.g.dart';
+
+@JsonSerializable(explicitToJson: true, includeIfNull: false)
+class SendMessageParams extends ApiParams {
+  String message;
+  String? replyTo;
+
+  SendMessageParams(this.message, {this.replyTo});
+
+  factory SendMessageParams.fromJson(Map<String, dynamic> json) => _$SendMessageParamsFromJson(json);
+  Map<String, dynamic> toJson() => _$SendMessageParamsToJson(this);
+}

lib/api/marianumcloud/talk/send_message/send_message_params.g.dart

@@ -0,0 +1,19 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'send_message_params.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+SendMessageParams _$SendMessageParamsFromJson(Map<String, dynamic> json) =>
+    SendMessageParams(
+      json['message'] as String,
+      replyTo: json['replyTo'] as String?,
+    );
+
+Map<String, dynamic> _$SendMessageParamsToJson(SendMessageParams instance) =>
+    <String, dynamic>{
+      'message': instance.message,
+      'replyTo': ?instance.replyTo,
+    };