实现企微原生材料预览（07-27-yang-jun-reimbursement-readiness）

client/src/api/invoicePool.ts

@@ -254,7 +254,13 @@ export async function bindInvoice(
 }
 
 export async function fetchInvoiceSignedUrl(invoiceId: string) {
-  return apiRequestData<{ signedUrl: string; expiresAt: string }>(
+  return apiRequestData<{
+    signedUrl: string;
+    expiresAt: string;
+    originalName: string | null;
+    mimeType: string | null;
+    fileSize: number | null;
+  }>(
     `/api/invoice-pool/${invoiceId}/signed-url`,
     {
       method: "POST",