• Fix "lightgray" error in plot_trend
• Address pygam incompatibility with newer scipy versions (automatic skip in tests, user warnings)
• Address fcsparser incompatibility with NumPy 2.0 (automatic skip in tests, user warnings)
• Use different joblib backend in Python 3.12+ with joblib < 1.5 to avoid ResourceTracker warnings
• More convenient cell-name handling for integers (e.g., in spatial data) with automatic type conversion