disable test due to GH runners ephemeral issue with Tk

Author: rozyczko

tests/summary/test_summary.py

@@ -177,6 +177,7 @@ def test_save_sld_plot(self, project: Project, tmp_path) -> None:
         # Expect
         assert os.path.exists(file_path)
 
+    @pytest.mark.skip(reason="Matplotlib issue with headless CI environments")
     def test_save_fit_experiment_plot(self, project: Project, tmp_path) -> None:
         # When
         summary = Summary(project)