✅(e2e) add test for 401 redirect and re-login flow

Ensures that when a user's session expires, they are
redirected to /401, can log back in, and are then sent
back to the page they were originally trying to access.

src/frontend/apps/e2e/__tests__/app-drive/redirect-401.spec.ts

@@ -0,0 +1,35 @@
+import test, { expect } from "@playwright/test";
+import { clearDb, keyCloakSignIn, login } from "./utils-common";
+import { createFolderInCurrentFolder } from "./utils-item";
+import { navigateToFolder } from "./utils-navigate";
+
+test("Redirects to /401 when session cookies are cleared then re-login and get redirected to the folder", async ({
+  page,
+  context,
+}) => {
+  await clearDb();
+  await page.goto("/");
+  await keyCloakSignIn(page, "drive", "drive");
+
+  await createFolderInCurrentFolder(page, "Secret folder");
+  await navigateToFolder(page, "Secret folder", ["My files", "Secret folder"]);
+  const folderUrl = page.url();
+
+  await context.clearCookies();
+
+  await page.reload();
+
+  await expect(page).toHaveURL(/.*\/401/, { timeout: 10000 });
+  await expect(
+    page.getByText("You need to be logged in to access the documents."),
+  ).toBeVisible();
+
+  await page
+    .locator(".drive__generic-disclaimer")
+    .getByRole("button", { name: "Login" })
+    .click();
+
+  await keyCloakSignIn(page, "drive", "drive", false);
+
+  await expect(page).toHaveURL(folderUrl);
+});