fix: fixed the deleting signature block issue on touchscreens (#809)

Fixed the deleting signature block issue on touchscreens, for some
reason the `onClick` event isn't working on the touchscreens that's why
I've added `onTouchEnd` event to delete the signature block when the
user clicks on it.

packages/ui/primitives/document-flow/field-item.tsx

@@ -121,6 +121,7 @@ export const FieldItem = ({
         <button
           className="text-muted-foreground/50 hover:text-muted-foreground/80 bg-background absolute -right-2 -top-2 z-20 flex h-8 w-8 items-center justify-center rounded-full border"
           onClick={() => onRemove?.()}
+          onTouchEnd={() => onRemove?.()}
         >
           <Trash className="h-4 w-4" />
         </button>