Improve pagination and loading experience in pitcher tab of Streamlit app

- Introduced pagination controls ('Previous' and 'Next' buttons) to enhance data navigation within the displayed frame.
- Adjusted the loading spinner implementation for league baseline data to improve user experience during data retrieval.
- Streamlined the display logic to ensure consistent presentation of data based on user selections.

src/streamlit_app.py

@@ -171,14 +171,26 @@ with pitcher_tab:
         disp_raw = disp_raw[['Player', 'PA', 'Hits', 'Singles', 'Doubles', 'Homeruns', 'Strikeoutper', 'Strikeouts', 'Walkper', 'Walks', 'xBA', 'xSLG', 'xwOBA', 'BABIP', 'AVG', 'FB%', 'True_AVG', 'xHits', 'xHRs', 'xHR/PA', 'HWSr']]
 
     st.session_state['sp_disp_frame'] = disp_raw
+    page_var = len(st.session_state['sp_disp_frame']) / 2
     sp_disp_container = st.container(border = True)
     sp_disp_container = sp_disp_container.empty()
     
-    with sp_disp_container:
-        if table_var_sp in (['League Aggregate Baselines', 'League Short Term Baselines', 'League Long Term Baselines']):
-            with st.spinner("Full league baselines can take some time to load"):
-                time.sleep(7)
-        st.dataframe(st.session_state['sp_disp_frame'].style.background_gradient(axis=0).background_gradient(cmap='RdYlGn_r').format(precision=2), height = 750, use_container_width = True, hide_index = True)
+    if table_var_sp in (['League Aggregate Baselines', 'League Short Term Baselines', 'League Long Term Baselines']):
+
+        with st.spinner("Full league baselines can take some time to load"):
+            time.sleep(7)
+        with sp_disp_container:
+            st.dataframe(st.session_state['sp_disp_frame'].style.background_gradient(axis=0).background_gradient(cmap='RdYlGn_r').format(precision=2), height = 500, use_container_width = True, hide_index = True)
+            col1, col2, col3, col4 = st.columns(4)
+            with col1:
+                if st.button('Previous'):
+                    st.session_state['sp_disp_frame'] = st.session_state['sp_disp_frame'].iloc[:page_var]
+            with col4:
+                if st.button('Next'):
+                    st.session_state['sp_disp_frame'] = st.session_state['sp_disp_frame'].iloc[page_var:]
+    else:
+        with sp_disp_container:
+            st.dataframe(st.session_state['sp_disp_frame'].style.background_gradient(axis=0).background_gradient(cmap='RdYlGn_r').format(precision=2), height = 500, use_container_width = True, hide_index = True)
 
 with hitter_tab:
     with st.container(border = True):