fix(repo): Mock base @formkit/auto-animate module in vitest setup

The base auto-animate module has side effects (setInterval/setTimeout
that call requestAnimationFrame) which fire after jsdom environment
teardown, causing 2 uncaught ReferenceError exceptions in @clerk/ui tests.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: brkalow

packages/clerk-js/vitest.setup.mts

@@ -269,6 +269,12 @@ vi.mock('@formkit/auto-animate/react', () => ({
   useAutoAnimate: () => [null],
 }));
 
+// Also mock the base module to prevent its side effects (setInterval/setTimeout
+// that call requestAnimationFrame) from firing after jsdom environment teardown.
+vi.mock('@formkit/auto-animate', () => ({
+  default: () => ({ enable: () => {}, disable: () => {}, destroy: () => {} }),
+}));
+
 // Mock browser-tabs-lock to prevent window access errors in tests
 vi.mock('browser-tabs-lock', () => {
   return {