Refactor contest size and strength input in app.py: replace individual input fields with a form layout for better organization and user experience, and ensure portfolio reset functionality is maintained upon submission.

app.py

@@ -796,16 +796,22 @@ with tab1:
 with tab2:
     if 'portfolio' in st.session_state and 'projections_df' in st.session_state:
         with st.container():
-            col1, col2, col3 = st.columns(3)
+            col1, col2 = st.columns(3)
             with col1:
                 if st.button('Reset Portfolio', key='reset_port'):
                     del st.session_state['working_frame']
 
             with col2:
-                Contest_Size = st.number_input("Enter Contest Size", value=25000, min_value=1, step=1)
-                
-            with col3:
-                strength_var = st.selectbox("Select field strength", ['Average', 'Sharp', 'Weak'])
+                with st.form(key='contest_size_form'):
+                    size_col, strength_col, submit_col = st.columns(3)
+                    with size_col:
+                        Contest_Size = st.number_input("Enter Contest Size", value=25000, min_value=1, step=1)
+                    with strength_col:
+                        strength_var = st.selectbox("Select field strength", ['Average', 'Sharp', 'Weak'])
+                    with submit_col:
+                        submitted = st.form_submit_button("Submit Size/Strength")
+                    if submitted:
+                        del st.session_state['working_frame']
         
         excluded_cols = ['salary', 'median', 'Own', 'Finish_percentile', 'Dupes', 'Stack', 'Win%', 'Lineup Edge', 'Weighted Own', 'Geomean']