Add reset functionality for portfolio in app.py: store original portfolio state and implement reset button to restore it, enhancing user experience during trimming options.

app.py

@@ -683,6 +683,7 @@ with tab2:
 
 with tab3:
     if 'portfolio' in st.session_state and 'projections_df' in st.session_state:
+        st.session_state['origin_portfolio'] = st.session_state['portfolio'].copy()
         
         excluded_cols = ['salary', 'median', 'Own', 'Finish_percentile', 'Dupes', 'Stack', 'Win%', 'Lineup Edge']
         with st.container():
@@ -801,6 +802,8 @@ with tab3:
                     
                     submitted = st.form_submit_button("Submit")
             with st.expander('Trimming Options'):
+                with st.button('Reset Portfolio'):
+                    st.session_state['portfolio'] = st.session_state['origin_portfolio'].copy()
                 with st.form(key='trim_form'):
                     performance_type = st.selectbox("Select sort type", ['median', 'Finish_percentile'])
                     own_type = st.selectbox("Select trimming variable type", ['Own', 'Product Own'])