test(po): fix intent type in TCS/Discount test (updatePo uses "save")

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

App/tests/integration/po-tcs-discount.test.ts

@@ -47,11 +47,12 @@ function as(userId: string, role: Role) {
 }
 
 // One line item: 10 × ₹100 @ 18% GST ⇒ taxable 1000, GST 180, incl-GST 1180.
-function form(title: string, intent: "draft" | "submit", tcs: number, discount: number) {
+function form(title: string, intent: string, tcs: number, discount: number) {
   const f = makePoForm({
-    title, vesselId, accountId, intent,
+    title, vesselId, accountId, intent: "draft",
     lineItems: [{ description: "Item", quantity: 10, unit: "pc", unitPrice: 100, gstRate: 0.18 }],
   });
+  f.set("intent", intent); // create: draft/submit · edit: save
   f.set("tcsAmount", String(tcs));
   f.set("discountAmount", String(discount));
   return f;