Implement single-row selection for lineup removal in Handbuilder tab of app.py, allowing users to easily remove players from the lineup. Update DataFrame display logic to enhance user interaction and streamline lineup management.

app.py

@@ -900,13 +900,11 @@ with tab4:
         lineup_slots = ['SP', 'SP', 'C', '1B', '2B', '3B', 'SS', 'OF', 'OF', 'OF']
         display_columns = ['Slot', 'Player', 'Order', 'Position', 'Team', 'Salary', 'Median', 'Own%']
 
-        # Prepare a DataFrame for display in the explicit order
         filled_lineup = st.session_state['handbuilder_lineup']
         display_rows = []
         used_indices = set()
 
         for slot in lineup_slots:
-            # Find the first player in the lineup who fills this slot and hasn't been used yet
             match = filled_lineup[(filled_lineup['Slot'] == slot) & (~filled_lineup.index.isin(used_indices))]
             if not match.empty:
                 row = match.iloc[0]
@@ -922,7 +920,6 @@ with tab4:
                     'Own%': row['Own%']
                 })
             else:
-                # Blank row for unfilled slot
                 display_rows.append({
                     'Slot': slot,
                     'Player': '',
@@ -936,13 +933,27 @@ with tab4:
 
         lineup_display_df = pd.DataFrame(display_rows, columns=display_columns)
 
-        st.dataframe(
+        # Show the lineup table with single-row selection for removal
+        event_remove = st.dataframe(
             lineup_display_df,
-            use_container_width=True,
+            on_select="rerun",
+            selection_mode=["single-row"],
+            key="lineup_remove",
             height=445,
             hide_index=True
         )
 
+        # If a row is selected and not blank, remove that player from the lineup
+        if event_remove and "rows" in event_remove.selection and len(event_remove.selection["rows"]) > 0:
+            idx = event_remove.selection["rows"][0]
+            player_to_remove = lineup_display_df.iloc[idx]['Player']
+            slot_to_remove = lineup_display_df.iloc[idx]['Slot']
+            if player_to_remove:  # Only remove if not blank
+                st.session_state['handbuilder_lineup'] = filled_lineup[
+                    ~((filled_lineup['Player'] == player_to_remove) & (filled_lineup['Slot'] == slot_to_remove))
+                ]
+                st.rerun()
+
         # --- SUMMARY ROW ---
         if not filled_lineup.empty:
             total_salary = filled_lineup['Salary'].sum()