fix: wait for async error element in duplicate registration test

The registration form uses async fetch (no page navigation), so
waitForLoadState returns immediately. Wait for the error element
to become visible instead of checking synchronously.

Author: devondragon

playwright/tests/auth/registration.spec.ts

@@ -89,16 +89,11 @@ test.describe('Registration', () => {
       await registerPage.acceptTerms();
       await registerPage.submit();
 
-      // Wait for response
-      await page.waitForLoadState('domcontentloaded');
-
-      // Should show error or redirect with error parameter
-      const url = page.url();
-      const hasError = await registerPage.hasGlobalError() ||
-                       await registerPage.hasExistingAccountError() ||
-                       url.includes('error');
-
-      expect(hasError).toBe(true);
+      // Registration uses async fetch — wait for the error element to appear
+      // rather than waiting for page navigation (which doesn't happen)
+      const globalError = page.locator('#globalError');
+      const existingAccountError = page.locator('#existingAccountError');
+      await expect(globalError.or(existingAccountError)).toBeVisible({ timeout: 10000 });
     });
 
     test('should reject mismatched passwords', async ({