test(e2e): add pre-release email login smoke test

e2e/specs/real/email-login-from-other-options.spec.ts

@@ -0,0 +1,52 @@
+import { expect, test } from "@playwright/test";
+
+const preReleaseHost = "frontend-test.banlv-ai.com";
+const baseURL = process.env.PLAYWRIGHT_BASE_URL ?? "";
+
+test.describe("pre-release email login smoke", () => {
+  test.skip(
+    !baseURL.includes(preReleaseHost),
+    `Run this test only with PLAYWRIGHT_BASE_URL pointing at ${preReleaseHost}.`,
+  );
+
+  test("guest can switch to email login from other sign-in options and return to chat", async ({
+    page,
+  }) => {
+    await page.goto("/splash", { waitUntil: "domcontentloaded" });
+
+    await expect(page.getByRole("button", { name: "Skip" })).toBeVisible();
+    await Promise.all([
+      page.waitForURL(/\/chat(?:\?.*)?$/, { timeout: 20_000 }),
+      page.getByRole("button", { name: "Skip" }).click(),
+    ]);
+
+    await expect(
+      page.getByRole("button", { name: "Sign up to unlock more features" }),
+    ).toBeVisible();
+    await Promise.all([
+      page.waitForURL(/\/auth(?:\?.*)?$/, { timeout: 20_000 }),
+      page
+        .getByRole("button", { name: "Sign up to unlock more features" })
+        .click(),
+    ]);
+
+    await page.getByRole("button", { name: "Other Sign In Options" }).click();
+    await expect(
+      page.getByRole("dialog", { name: "Other sign-in options" }),
+    ).toBeVisible();
+
+    await page.getByRole("button", { name: "Email Sign In" }).click();
+    await expect(page.getByPlaceholder("Email")).toHaveValue(
+      "chanwillian0@gmail.com",
+    );
+    await expect(page.getByPlaceholder("Password")).toHaveValue("12345678");
+
+    await Promise.all([
+      page.waitForURL(/\/chat(?:\?.*)?$/, { timeout: 20_000 }),
+      page.getByRole("button", { name: "Login" }).click(),
+    ]);
+
+    await expect(page.getByRole("button", { name: "Menu" })).toBeVisible();
+    await expect(page.getByRole("textbox", { name: "Message" })).toBeVisible();
+  });
+});