feat: implement event creation flow and management widgets with preparation tracking buttons

em2rp/lib/controllers/event_form_controller.dart

@@ -433,6 +433,11 @@ class EventFormController extends ChangeNotifier {
     }
   }
 
+  Future<bool> submitAsConfirmed(BuildContext context) async {
+    _selectedStatus = EventStatus.confirmed;
+    return await submitForm(context);
+  }
+
   Future<bool> deleteEvent(BuildContext context, String eventId) async {
     _isLoading = true;
     _error = null;