test: remove timing races from screen-sync and route transition tests (#138) (#166)

src/test/setup.ts

@@ -1,5 +1,6 @@
 import "@testing-library/jest-dom/vitest";
 import { cleanup, configure } from "@testing-library/react";
+import { MotionGlobalConfig } from "motion/react";
 import { afterAll, afterEach, beforeAll, vi } from "vitest";
 
 import { configureAuthClient } from "@/shared/api";
@@ -10,6 +11,9 @@ import { server } from "./server";
 // Allow async UI updates on the slower CI runner; local waits stay unchanged.
 if (process.env.CI) configure({ asyncUtilTimeout: 5000 });
 
+// Route fades start at opacity 0; under load toBeVisible can catch that frame.
+MotionGlobalConfig.skipAnimations = true;
+
 beforeAll(() => server.listen({ onUnhandledRequest: "error" }));
 afterEach(() => {
 	cleanup();