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

lib/api/webuntis/queries/get_holidays/get_holidays.dart

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+import 'dart:convert';
+
+import '../../webuntis_api.dart';
+import 'get_holidays_response.dart';
+
+class GetHolidays extends WebuntisApi {
+  GetHolidays() : super('getHolidays', null);
+
+  @override
+  Future<GetHolidaysResponse> run() async {
+    final rawAnswer = await query(this);
+    return finalize(GetHolidaysResponse.fromJson(jsonDecode(rawAnswer) as Map<String, dynamic>));
+  }
+
+  static GetHolidaysResponseObject? find(GetHolidaysResponse holidaysResponse, {DateTime? time}) {
+    time ??= DateTime.now();
+    time = DateTime(time.year, time.month, time.day, 0, 0, 0, 0, 0);
+
+    for (var element in holidaysResponse.result) {
+      var start = DateTime.parse(element.startDate.toString());
+      var end = DateTime.parse(element.endDate.toString());
+
+      if(!start.isAfter(time) && !end.isBefore(time)) return element;
+    }
+    return null;
+  }
+
+}