Update Streamlit app to adjust tab selector width from 'content' to 'stretch' for enhanced layout flexibility.

src/streamlit_app.py

@@ -74,7 +74,7 @@ selected_tab = st.segmented_control(
     options=["Regular Slate Contest Sims", "Showdown Contest Sims"],
     selection_mode='single',
     default='Regular Slate Contest Sims',
-    width='content',
+    width='stretch',
     label_visibility='collapsed',
     key='tab_selector'
 )