Cast metadata to string - so no type mismatches occur

src/app.py

@@ -475,7 +475,7 @@ def main():
 
             # Create a DataFrame for better display
             metadata_df = pd.DataFrame(
-                {"Field": metadata_cols, "Value": metadata.values}
+                {"Field": metadata_cols, "Value": [str(v) for v in metadata.values]}
             )
             st.table(metadata_df)