fix: pass initial day to weekday selection to prevent resetting to monday

The widget is rebuild when you come back from the weekoverview to the edit page so the previous selected day should stay on the same day

packages/flutter_availability/lib/src/ui/screens/template_week_modification.dart

@@ -182,7 +182,10 @@ class _WeekTemplateModificationScreenState
       const SizedBox(height: 24),
       Padding(
         padding: EdgeInsets.only(left: spacing.sidePadding),
-        child: TemplateWeekDaySelection(onDaySelected: onDaySelected),
+        child: TemplateWeekDaySelection(
+          initialSelectedDay: _selectedDay.index,
+          onDaySelected: onDaySelected,
+        ),
       ),
       const SizedBox(height: 24),
       _WeekTemplateSidePadding(

packages/flutter_availability/lib/src/ui/widgets/template_week_day_selection.dart

@@ -9,9 +9,14 @@ class TemplateWeekDaySelection extends StatefulWidget {
   /// Creates a [TemplateWeekDaySelection]
   const TemplateWeekDaySelection({
     required this.onDaySelected,
+    required this.initialSelectedDay,
     super.key,
   });
 
+  /// The initial day that should be selected when the widget is first created
+  /// This should be an index of the days of the week starting with 0 for Monday
+  final int initialSelectedDay;
+
   /// Callback for when a day is selected
   final void Function(int) onDaySelected;
 
@@ -21,7 +26,7 @@ class TemplateWeekDaySelection extends StatefulWidget {
 }
 
 class _TemplateWeekDaySelectionState extends State<TemplateWeekDaySelection> {
-  int _selectedDayIndex = 0;
+  late int _selectedDayIndex = widget.initialSelectedDay;
 
   @override
   Widget build(BuildContext context) {