test(e2e): update specs for multi-character routes

e2e/specs/mock/auth/psid-login-from-external-entry.spec.ts

@@ -1,7 +1,10 @@
 import { expect, test } from "@playwright/test";
 
 import { mockCoreApis } from "@e2e/fixtures/api-mocks";
-import { clearBrowserState } from "@e2e/fixtures/test-helpers";
+import {
+  clearBrowserState,
+  defaultCharacterChatUrl,
+} from "@e2e/fixtures/test-helpers";
 
 const psid = "e2e-facebook-psid";
 
@@ -27,7 +30,7 @@ test("user enters from an external PSID link and becomes a guest", async ({
   });
   expect(psidLoginRequest.postDataJSON().deviceId).toEqual(expect.any(String));
 
-  await expect(page).toHaveURL(/\/chat$/);
+  await expect(page).toHaveURL(defaultCharacterChatUrl);
   await expect(page.getByRole("textbox", { name: "Message" })).toBeVisible();
 
   await expect