Implement form submission for small field preset in app.py: add a submit button to apply lineup target changes, enhancing user interaction and ensuring updates to the working frame are only processed upon user confirmation.

app.py

@@ -1104,9 +1104,11 @@ with tab2:
             with st.expander('Presets'):
                 with st.form(key='Small Field Preset'):
                     lineup_target = st.number_input("Lineup Target", value=150, min_value=1, step=1)
-                    parsed_frame = small_field_preset(st.session_state['working_frame'], lineup_target)
-                    st.session_state['working_frame'] = parsed_frame.sort_values(by='Own', ascending=False)
-                    st.session_state['export_merge'] = st.session_state['working_frame'].copy()
+                    submitted = st.form_submit_button("Submit")
+                    if submitted:
+                        parsed_frame = small_field_preset(st.session_state['working_frame'], lineup_target)
+                        st.session_state['working_frame'] = parsed_frame.sort_values(by='Own', ascending=False)
+                        st.session_state['export_merge'] = st.session_state['working_frame'].copy()
 
         with col2:
             if 'export_base' not in st.session_state: