feat(documents): shared CustomFieldsPrintPicker + detail query types

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/admin/lib/queries/issued-orders.ts

@@ -60,6 +60,7 @@ export interface IssuedOrderDetail extends IssuedOrder {
   sections: IssuedOrderSection[];
   supplier: Record<string, unknown> | null;
   valid_transitions: string[];
+  selected_custom_fields: number[];
   /** Fresh edit lock held by ANOTHER user (same shape as offers), else null. */
   locked_by: {
     user_id: number;