feat: enable entering additional remarks in offer confirmation

src/Service/AccommodationBookingService.php

@@ -387,14 +387,28 @@ class AccommodationBookingService
     /**
      * All accommodation mail is sent from the group desk address so customer replies
      * land there rather than in the general inbox.
+     *
+     * A booking can legitimately have no email yet (drafts, and offers created without
+     * contact data), so a missing recipient is logged and skipped rather than thrown:
+     * the caller's own work — accepting an offer, for instance — is already done and
+     * must not fail over an undeliverable notification.
      */
     private function sendBookingEmail(
         AccommodationBooking $booking,
-        string $to,
+        ?string $to,
         string $subject,
         string $template,
         string $errorMessage,
     ): void {
+        if (null === $to || '' === trim($to)) {
+            $this->logger->warning($errorMessage, [
+                'booking_id' => $booking->getId(),
+                'error' => 'No recipient email address on the booking.',
+            ]);
+
+            return;
+        }
+
         try {
             $this->mailer->createAndSendEmail(
                 [
@@ -486,13 +500,21 @@ class AccommodationBookingService
      * only the status moves to Bestätigt, so an offer-originated booking remains
      * distinguishable from a direct one.
      * Idempotent — a no-op (including no emails) if the offer is not open any more.
+     *
+     * @param ?string $remarks null leaves the stored remark untouched, a string replaces it,
+     *                         an empty string clears it
      */
-    public function acceptBooking(AccommodationBooking $booking): void
+    public function acceptBooking(AccommodationBooking $booking, ?string $remarks = null): void
     {
         if (!$booking->isInquiry() || !$booking->isOpen()) {
             return;
         }
 
+        if (null !== $remarks) {
+            $trimmed = trim($remarks);
+            $booking->setRemarks('' === $trimmed ? null : $trimmed);
+        }
+
         $booking->setStatus(AccommodationBookingStatus::Accepted);
         $booking->setAcceptedAt(new \DateTimeImmutable());
         $this->entityManager->flush();