chore(orders): drop unused attachmentsLoading state from Send PO panel

src/app/(app)/orders/[id]/page.tsx

@@ -112,9 +112,10 @@ export default function OrderDetailPage({ params }: { params: Promise<{ id: stri
   // Additional attachments (supplier quote, drawing, NDA, etc.) sent
   // alongside the PO PDF. PB stores these as file tokens in
   // `po.additional_attachments`; the modal reads them on open and
-  // writes back via the upload/delete routes.
+  // writes back via the upload/delete routes. `attachmentUploading`
+  // covers both upload and delete — a single "working" flag is
+  // enough for the small panel.
   const [attachments, setAttachments] = useState<string[]>([]);
-  const [attachmentsLoading, setAttachmentsLoading] = useState(false);
   const [attachmentUploading, setAttachmentUploading] = useState(false);
   const [loading, setLoading] = useState(true);
   const [deleteOpen, setDeleteOpen] = useState(false);