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

lib/view/pages/timetable/widgets/appointment_tile.dart

@@ -56,7 +56,7 @@ class AppointmentTile extends StatelessWidget {
           ),
           if (crossedOut)
             Positioned.fill(
-              child: Container(
+              child: DecoratedBox(
                 decoration: BoxDecoration(
                   border: Border.all(width: 2, color: Colors.red.withAlpha(200)),
                   borderRadius: const BorderRadius.all(Radius.circular(7)),

lib/view/pages/timetable/widgets/custom_workweek_calendar.dart

@@ -392,7 +392,7 @@ class _PeriodLabel extends StatelessWidget {
     return LayoutBuilder(
       builder: (context, constraints) {
         final showTimes = constraints.maxHeight >= 38;
-        return Container(
+        return DecoratedBox(
           decoration: BoxDecoration(
             border: Border(top: BorderSide(color: dividerColor, width: 0.5)),
           ),
@@ -561,7 +561,7 @@ class _DayColumn extends StatelessWidget {
     return GestureDetector(
       behavior: HitTestBehavior.translucent,
       onLongPressStart: (details) => _handleLongPress(details, dayAppointments),
-      child: Container(
+      child: DecoratedBox(
       decoration: BoxDecoration(
         color: isToday ? theme.colorScheme.primary.withAlpha(14) : null,
         border: Border(left: BorderSide(color: theme.dividerColor.withAlpha(90), width: 0.5)),

lib/view/pages/timetable/widgets/special_regions_builder.dart

@@ -1,7 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:syncfusion_flutter_calendar/calendar.dart';
 
-import '../../../../api/webuntis/queries/getHolidays/getHolidaysResponse.dart';
+import '../../../../api/webuntis/queries/get_holidays/get_holidays_response.dart';
 import '../../../../extensions/date_time.dart';
 import '../data/calendar_layout.dart';
 import '../data/lesson_period_schedule.dart';