fix: resolve CI test failures with proper mock patching

tests/test_cli.py

@@ -120,9 +120,11 @@ class TestCLI:
         assert result.exit_code == 0
         assert 'No project type detected' in result.output
 
-    def test_detect_with_project(self, runner, temp_dir):
+    def test_detect_with_project(self, runner):
         """Test detect when project is found."""
-        with patch('gitignore_generator.detector.ProjectDetector') as mock_detector:
+        from gitignore_generator import cli
+        with runner.isolated_filesystem():
+            with patch.object(cli, 'ProjectDetector') as mock_detector:
                 mock_instance = MagicMock()
                 mock_instance.detect.return_value = ['python']
                 mock_instance.suggest_gitignore.return_value = ['python']
@@ -132,8 +134,7 @@ class TestCLI:
                 mock_detector.return_value = mock_instance
 
                 with patch('gitignore_generator.api.get_patterns') as mock_patterns:
-                mock_patterns.return_value = '__pycache__/\n'
+                    mock_patterns.return_value = 'content'
-                with runner.isolated_filesystem():
                     result = runner.invoke(detect, ['--preview'])
 
         assert result.exit_code == 0