Add working_frame initialization in app.py: create a copy of the portfolio in session state to ensure consistent data handling across operations, enhancing clarity and maintainability.

app.py

@@ -782,6 +782,7 @@ with tab2:
                 strength_var = st.selectbox("Select field strength", ['Average', 'Sharp', 'Weak'])
 
         if 'working_frame' not in st.session_state:
+            st.session_state['working_frame'] = st.session_state['portfolio'].copy()
             if site_var == 'Draftkings':
                 if type_var == 'Classic':
                     if sport_var == 'CS2':