chore(pdf): silence unused-vars on intentional totalAmount destructure

Co-authored-by: Orca <help@stably.ai>

src/lib/pdf/purchase-order-document.tsx

@@ -85,6 +85,12 @@ export function PurchaseOrderDocument({
   generatedAtIso,
   totalAmount,
 }: PurchaseOrderDocumentProps) {
+  // `totalAmount` is kept on the interface and in the destructure for API
+  // backwards compat with the route handler — the printed Total is
+  // subtotal + vat, so the prop has no effect here. The `void` reference
+  // is the documented way to silence @typescript-eslint/no-unused-vars
+  // without losing the destructure.
+  void totalAmount;
   const accent =
     letterhead.accent_color ||
     defaultAccentFor(