feat: add admin views, a booking horizon and confirmation modals

Co-Authored-By: Claude Opus 5 <[email protected]>

src/Entity/BookingSeries.php

@@ -22,9 +22,6 @@ use Doctrine\ORM\Mapping as ORM;
 #[ORM\Entity(repositoryClass: BookingSeriesRepository::class)]
 class BookingSeries
 {
-    /** A series may not run further out than this; desks are not booked years ahead. */
-    public const MAX_MONTHS = 12;
-
     #[ORM\Id]
     #[ORM\GeneratedValue]
     #[ORM\Column]