feat: replace edit participant facade with context factory

src/Form/Model/BookingEditParticipantContext.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Form\Model;
+
+use App\BusProNet\Model\BaseData;
+use App\BusProNet\Model\Booking;
+
+/**
+ * Bundles the data needed to render an edit-participant page.
+ */
+class BookingEditParticipantContext
+{
+    public function __construct(
+        public readonly BookingDto $bookingDto,
+        public readonly Booking $bookingData,
+        public readonly ?BaseData $mutableData,
+        public readonly BookingSummaryDto $summaryData,
+    ) {
+    }
+}