feat: consistent display of included services and prices

src/Twig/AppRuntime.php

@@ -52,6 +52,26 @@ class AppRuntime implements RuntimeExtensionInterface
         return $this->intlExtension->formatCurrency($amount, 'EUR');
     }
 
+    /**
+     * Formats a service price, showing "inkl." for zero-priced (included) services.
+     *
+     * @param float|int|null $price The price to format
+     *
+     * @return string The formatted price or "inkl." for zero/null prices
+     */
+    public function formatServicePrice(float|int|null $price): string
+    {
+        if (null === $price) {
+            return '';
+        }
+
+        if (0 === $price || 0.0 === $price) {
+            return 'inkl.';
+        }
+
+        return $this->intlExtension->formatCurrency((float) $price, 'EUR');
+    }
+
     public function mapStatus(string $status): string
     {
         $status = strtoupper($status);