test: align pi-ai oauth mocks

test/setup.ts

@@ -1,5 +1,15 @@
 import { afterAll, afterEach, beforeAll, vi } from "vitest";
 
+vi.mock("@mariozechner/pi-ai", async (importOriginal) => {
+  const original = await importOriginal<typeof import("@mariozechner/pi-ai")>();
+  return {
+    ...original,
+    getOAuthApiKey: () => undefined,
+    getOAuthProviders: () => [],
+    loginOpenAICodex: vi.fn(),
+  };
+});
+
 vi.mock("@mariozechner/pi-ai/oauth", () => ({
   getOAuthApiKey: () => undefined,
   getOAuthProviders: () => [],