fix(frontend): the Microsoft onboarding smoke test signs in through the API

The test typed its email and password into /login straight after the page
loaded. On 46b3d63's CI run the form was replaced right after the email went
in (the page's session checks re-rendered it), so it submitted an empty email,
showed "Invalid email" and never left /login. The test is about onboarding, so
it now signs in through /api/auth/sign-in/email, as the journeys do.

Run locally against a full stack with the seeded Microsoft user: passes,
reaching the Microsoft 365 offer and the team step after "Not now".

Co-authored-by: Claude Opus 5.5 (Claude Code) <[email protected]>

autogpt_platform/frontend/src/playwright/microsoft-sign-in-happy-path.spec.ts

@@ -3,21 +3,22 @@ import { getSeededTestUser } from "./credentials/accounts";
 
 test("microsoft sign-up: onboarding opens on the Microsoft 365 offer", async ({
   page,
+  baseURL,
 }) => {
   test.setTimeout(90000);
   const user = getSeededTestUser("microsoftSignIn");
 
-  // Not LoginPage.login, which completes onboarding on the way past it.
-  await page.goto("/login");
-  await page.locator('input[type="email"]').fill(user.email);
-  await page.locator('input[type="password"]').fill(user.password);
-  await page.getByRole("button", { name: "Log in", exact: true }).click();
-  await page.waitForURL((url) => url.pathname !== "/login");
+  // Signs in through the API, since this test is about onboarding: the login
+  // form can be replaced just after it loads, dropping a typed email. Not
+  // LoginPage.login either, which completes onboarding on the way past it.
+  const signIn = await page.request.post("/api/auth/sign-in/email", {
+    headers: { Origin: new URL(baseURL ?? "http://localhost:3000").origin },
+    data: { email: user.email, password: user.password },
+  });
+  expect(signIn.ok(), `sign-in failed: ${signIn.status()}`).toBe(true);
 
   // Start onboarding over, so a retry doesn't resume or skip the last attempt.
-  const reset = await page.request.post(
-    new URL("/api/proxy/api/onboarding/reset", page.url()).toString(),
-  );
+  const reset = await page.request.post("/api/proxy/api/onboarding/reset");
   expect(reset.ok()).toBe(true);
   await page.goto("/onboarding");