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

lib/api/errors/error_mapper.dart

@@ -3,9 +3,9 @@ import 'dart:io';
 
 import 'package:http/http.dart' as http;
 
-import '../apiError.dart';
-import '../marianumcloud/talk/talkError.dart';
-import '../webuntis/webuntisError.dart';
+import '../api_error.dart';
+import '../marianumcloud/talk/talk_error.dart';
+import '../webuntis/webuntis_error.dart';
 import 'app_exception.dart';
 import 'network_exception.dart';
 import 'parse_exception.dart';

lib/api/errors/talk_exception.dart

@@ -1,4 +1,4 @@
-import '../marianumcloud/talk/talkError.dart';
+import '../marianumcloud/talk/talk_error.dart';
 import 'app_exception.dart';
 
 class TalkException extends AppException {

lib/api/errors/webuntis_exception.dart

@@ -1,4 +1,4 @@
-import '../webuntis/webuntisError.dart';
+import '../webuntis/webuntis_error.dart';
 import 'app_exception.dart';
 
 class WebuntisException extends AppException {