test(auth): cover PSID external entry login

e2e/fixtures/api/auth.ts

@@ -1,14 +1,24 @@
 import type { Page } from "@playwright/test";
 
 import { apiEnvelope } from "../data/common";
-import { emailLoginResponse, guestLoginResponse, refreshedEmailLoginResponse, refreshedGuestLoginResponse } from "../data/auth";
+import { emailLoginResponse, guestLoginResponse, psidLoginResponse, refreshedEmailLoginResponse, refreshedGuestLoginResponse } from "../data/auth";
 
 export interface AuthMockState {
   chatSendTokenRefreshFlow: boolean;
   isChatSendTokenExpired: () => boolean;
+  psidLoginFlow: boolean;
 }
 
 export async function registerAuthMocks(page: Page, state: AuthMockState) {
+  await page.route("**/api/auth/login/facebook/psid", async (route) => {
+    if (!state.psidLoginFlow) {
+      await route.continue();
+      return;
+    }
+
+    await route.fulfill({ json: apiEnvelope(psidLoginResponse) });
+  });
+
   await page.route("**/api/auth/guest", async (route) => {
     const response = state.chatSendTokenRefreshFlow && state.isChatSendTokenExpired() ? refreshedGuestLoginResponse : guestLoginResponse;
     await route.fulfill({ json: apiEnvelope(response) });