Refactor export handling in app.py: simplify the initialization of the export_merge session state variable by removing the conditional check, ensuring it always reflects the current portfolio state for accurate export operations.

app.py

@@ -982,6 +982,7 @@ with tab2:
                         
                         st.session_state['portfolio'] = trim_portfolio(st.session_state['portfolio'], trim_slack_var, performance_type, own_type, performance_threshold_high, performance_threshold_low, own_threshold_high, own_threshold_low)
                         st.session_state['portfolio'] = st.session_state['portfolio'].sort_values(by='median', ascending=False)
+                        st.session_state['export_merge'] = st.session_state['portfolio'].copy()
 
         with col2:
             st.session_state['portfolio'] = predict_dupes(st.session_state['portfolio'], map_dict, site_var, type_var, Contest_Size, strength_var, sport_var)
@@ -1022,8 +1023,7 @@ with tab2:
                 )
                 st.session_state['portfolio'] = st.session_state['portfolio'][lock_mask]
             st.session_state['portfolio'] = st.session_state['portfolio'].sort_values(by='median', ascending=False)
-            if 'export_merge' not in st.session_state:
-                st.session_state['export_merge'] = st.session_state['portfolio'].copy()
+            st.session_state['export_merge'] = st.session_state['portfolio'].copy()
             with st.expander("Download options"):
                 if stack_dict is not None:
                     download_type = st.selectbox("Simple or Advanced Download?", options=['Simple', 'Advanced'], key='download_choice')