add cancel button to confirm popup

src/components/popup/ConfirmPopup.svelte

@@ -25,6 +25,7 @@
       <h3 class="text-lg font-geist">{$confirmPopupState?.title}</h3>
       <p class="py-4 whitespace-pre-line">{$confirmPopupState?.message}</p>
       <button class="btn" onclick={() => $confirmPopupState?.onConfirm()}>Ok</button>
+      <button class="btn">Abbrechen</button>
     </div>
   </form>
   <form method="dialog" class="modal-backdrop bg-[rgba(0,0,0,.3)]">