feat: conditionally render room assignment field in participant edit form

src/Form/Service/Condition/BookingModeCondition.php

@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Form\Service\Condition;
+
+use App\Form\Model\BookingDto;
+use App\Form\Service\Contract\FieldConditionInterface;
+
+/**
+ * Condition that evaluates based on the booking workflow mode.
+ *
+ * Used to apply field states that should only be active in a specific mode
+ * (create or edit), such as making room assignments readonly in edit mode.
+ */
+class BookingModeCondition implements FieldConditionInterface
+{
+    /**
+     * @param string $mode The mode to check against (BookingDto::MODE_CREATE or BookingDto::MODE_EDIT)
+     */
+    public function __construct(
+        private readonly string $mode,
+    ) {
+        if (BookingDto::MODE_CREATE !== $mode && BookingDto::MODE_EDIT !== $mode) {
+            throw new \InvalidArgumentException(sprintf('Invalid mode "%s". Must be one of: %s, %s', $mode, BookingDto::MODE_CREATE, BookingDto::MODE_EDIT));
+        }
+    }
+
+    public function evaluate(BookingDto $bookingDto, int $participantIndex, array $formData): bool
+    {
+        return $this->mode === $bookingDto->getMode();
+    }
+
+    public function getDependentFields(): array
+    {
+        return [];
+    }
+
+    public function getDescription(): string
+    {
+        return sprintf('Returns true when booking is in %s mode', $this->mode);
+    }
+}