refactor(logging): replace console usage in auth flows

utils/__tests__/error.test.ts

@@ -0,0 +1,27 @@
+import { normalizeError } from '../error';
+
+describe('normalizeError', () => {
+  it('returns the same error instance when provided', () => {
+    const error = new Error('test');
+    expect(normalizeError(error)).toBe(error);
+  });
+
+  it('converts strings into Error instances', () => {
+    const result = normalizeError('failure');
+    expect(result).toBeInstanceOf(Error);
+    expect(result.message).toBe('failure');
+  });
+
+  it('stringifies objects when creating the error message', () => {
+    const result = normalizeError({ reason: 'timeout', code: 504 });
+    expect(result.message).toBe('{"reason":"timeout","code":504}');
+  });
+
+  it('falls back to a generic error for unserializable input', () => {
+    const circular: Record<string, unknown> = {};
+    circular.self = circular;
+
+    const result = normalizeError(circular);
+    expect(result.message).toBe('Unknown error');
+  });
+});