implemented absence report module with form validation, prefill support, and API integration

lib/state/app/modules/app_modules.dart

@@ -6,6 +6,7 @@ import 'package:persistent_bottom_nav_bar_v2/persistent_bottom_nav_bar_v2.dart';
 import '../../../api/marianumconnect/queries/get_breakers/get_breakers_response.dart';
 import '../../../routing/app_routes.dart';
 import '../../../storage/modules_settings.dart';
+import '../../../view/pages/absence_report/absence_report_view.dart';
 import '../../../view/pages/files/files.dart';
 import '../../../view/pages/grade_averages/grade_averages_view.dart';
 import '../../../view/pages/holidays/holidays_view.dart';
@@ -137,6 +138,12 @@ class AppModule {
         breakerArea: BreakerArea.dates,
         create: MarianumDatesView.new,
       ),
+      Modules.absenceReport: AppModule(
+        Modules.absenceReport,
+        name: 'Krankmeldung',
+        icon: () => Icon(Icons.sick_outlined),
+        create: AbsenceReportView.new,
+      ),
     };
 
     if (!showFiltered) {
@@ -286,4 +293,5 @@ enum Modules {
   gradeAveragesCalculator,
   holidays,
   marianumDates,
+  absenceReport,
 }