fix(tests): suppress expected console output during tests

Mock console.error and console.log in test setup to prevent
noisy stderr output from error handling tests. The error
messages were expected behavior being tested, not actual failures.

vitest.setup.ts

@@ -1,5 +1,20 @@
 import "@testing-library/jest-dom";
-import { vi } from "vitest";
+import { vi, beforeAll, afterAll } from "vitest";
+
+// Suppress console.error and console.log during tests to reduce noise
+// These are expected outputs from error handling tests
+const originalConsoleError = console.error;
+const originalConsoleLog = console.log;
+
+beforeAll(() => {
+  console.error = vi.fn();
+  console.log = vi.fn();
+});
+
+afterAll(() => {
+  console.error = originalConsoleError;
+  console.log = originalConsoleLog;
+});
 
 // Mock environment variables
 process.env.NEXTAUTH_SECRET = "test-secret";