feat: info text and correct field type for service group 'VEG'

addresses #869bvch71

src/Form/Service/ParticipantFieldOptionsProvider.php

@@ -258,7 +258,7 @@ class ParticipantFieldOptionsProvider extends AbstractFieldOptionsProvider
             ];
         };
 
-        // Veg (vegetarian/vegan) field provider - provides dietary preference options as radio buttons (mutually exclusive)
+        // Veg (vegetarian/vegan) field provider - provides dietary preference options as dropdown
         // Returns empty array when no dietary options available
         $this->fieldOptionProviders['veg'] = function (BookingDto $bookingDto, int $participantIndex, array $options = []): array {
             $choices = $this->filterServicesByAgeConstraints(
@@ -274,11 +274,21 @@ class ParticipantFieldOptionsProvider extends AbstractFieldOptionsProvider
             return [
                 'label' => 'Verpflegungswunsch',
                 'multiple' => false,
-                'expanded' => true,
+                'expanded' => false,
                 'required' => false,
+                'placeholder' => 'Verpflegungswunsch...',
                 'choices' => $choices,
                 'choice_value' => 'id',
-                'choice_label' => fn (?Service $service) => $service?->label,
+                'choice_label' => function (?Service $service): ?string {
+                    if (null === $service) {
+                        return null;
+                    }
+                    $priceLabel = (null === $service->price || 0.0 === $service->price)
+                        ? 'inkl.'
+                        : number_format($service->price, 2, ',', '.') . ' €';
+
+                    return $service->label . ' (' . $priceLabel . ')';
+                },
                 'choice_attr' => function (?Service $service) use ($bookingDto, $participantIndex) {
                     if (null === $service) {
                         return [];