test(e2e): SLICE-5 scenarios — preview/confirm, errors, rejection, cancel (§6.8)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

e2e/tests/import-file-rejected.spec.ts

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+// DoD scenario e2e_import_file_rejected (SD-0002 §6.8): a file-level rejection
+// (PUC-5a) renders in place on the upload screen, the picker stays live for a
+// retry, and nothing is recorded — no products, no run.
+import { expect, test } from "@playwright/test";
+import { gotoProducts, signUpWithStorefront, uploadFixture } from "../helpers";
+
+test("e2e_import_file_rejected", async ({ page }) => {
+  await signUpWithStorefront(page);
+  await gotoProducts(page);
+  await uploadFixture(page, "missing-title.csv");
+
+  // The rejection renders in place, naming the missing column.
+  await expect(page.getByText("That file can't be imported")).toBeVisible();
+  await expect(page.getByText("missing the required column 'Title'")).toBeVisible();
+
+  // The picker is live again for a retry.
+  await expect(page.locator('input[type="file"]')).toBeEnabled();
+
+  // No trace: still the empty catalog, and no run recorded.
+  await gotoProducts(page);
+  await expect(
+    page.getByText("No products yet. Bulk import is how product data gets in."),
+  ).toBeVisible();
+  await expect(page.getByText("No imports yet.")).toBeVisible();
+});