Update src/streamlit_app.py

src/streamlit_app.py

@@ -31,6 +31,8 @@ try:
 except ImportError as e:
     print(f"Failed to import MatterSimCalculator: {e}")
     mattersim_available = False
+from mattersim.forcefield import MatterSimCalculator
+mattersim_available = True
 # Define version threshold
 required_version = "2.0.0"