Refactor portfolio storage in session state to use compressed format directly

Updated the handling of the portfolio in session state by storing it in a compressed format, improving memory efficiency. Removed the redundant storage of the original portfolio to streamline session state management.

app.py

@@ -591,10 +591,10 @@ if selected_tab == 'Data Load':
                 st.session_state['map_dict'] = create_memory_efficient_mappings(st.session_state['projections_df'], site_var, type_var, sport_var)
             
             # Store portfolio in compressed format and clean up
-            st.session_state['origin_portfolio'] = st.session_state['portfolio']
+            # st.session_state['origin_portfolio'] = st.session_state['portfolio']
             buffer = io.BytesIO()
             st.session_state['portfolio'].to_parquet(buffer, compression='snappy')
-            st.session_state['origin_portfolio_compressed'] = buffer.getvalue()
+            st.session_state['origin_portfolio'] = buffer.getvalue()
             
             # Clear large objects from session state to free memory
             del st.session_state['portfolio'], st.session_state['export_portfolio']