Polish mobile and web experience

apps/mobile/tests/cross-client-parity.test.ts

@@ -10,7 +10,9 @@ import {
 import { fetchAuthCapabilities } from "../lib/auth-capabilities";
 import { EXPENSE_CATEGORIES as appExpenseCategories } from "../lib/expense-categories";
 import { getInvoiceStatus } from "../lib/invoice-status";
+import { generateInvoiceNumber as generateMobileInvoiceNumber } from "../lib/invoice-number";
 import { formatElapsedSeconds as formatAppElapsedSeconds } from "../lib/time-clock";
+import { generateInvoiceNumber as generateWebInvoiceNumber } from "../../web/src/lib/draft-invoice";
 import { safeCallbackPath } from "../../web/src/lib/safe-callback-url";
 import {
   normalizeOptionalId,
@@ -47,6 +49,13 @@ describe("auth contract smoke checks", () => {
 });
 
 describe("invoice parity", () => {
+  test("web and mobile use the device-local date in invoice numbers", () => {
+    const lateLocalEvening = new Date(2026, 7, 16, 23, 30, 0, 123);
+
+    expect(generateMobileInvoiceNumber(lateLocalEvening)).toStartWith("INV-20260816-");
+    expect(generateWebInvoiceNumber(lateLocalEvening)).toStartWith("INV-20260816-");
+  });
+
   test("web and mobile agree on draft, paid, sent, and overdue states", () => {
     const today = new Date();
     today.setHours(0, 0, 0, 0);