feat: refactor to cards

src/Form/Model/BookingDto.php

@@ -49,7 +49,7 @@ class BookingDto
 
     /**
      * Booking status code for API submission.
-     * Values: 'F' (Final/Frei), 'A' (Anfrage/Inquiry)
+     * Values: 'F' (Final/Frei), 'A' (Anfrage/Inquiry).
      */
     public string $bookingStatus = 'F';
 
@@ -64,6 +64,13 @@ class BookingDto
      */
     public ?\DateTimeImmutable $lastSessionUpdate = null;
 
+    /**
+     * Fingerprint of the booking state when loaded from API (edit mode only).
+     * This property stores the original state and is never updated after initial load.
+     * Used to detect unsaved changes in edit mode by comparing with current state.
+     */
+    public ?string $originalFingerprint = null;
+
     public function __construct(public Travel $travel, public int $hotelId)
     {
     }