fix: Add missing logger import and configuration

src/pages/trading/trading_system_page.py

@@ -1,3 +1,4 @@
+import logging
 import streamlit as st
 from trading.journal import get_latest_portfolio_value, get_open_trades_summary
 from trading.position_calculator import PositionCalculator
@@ -11,6 +12,9 @@ from trading.watchlist import (
     remove_from_watchlist, get_watchlist_items, WatchlistItem
 )
 
+# Configure logging
+logger = logging.getLogger(__name__)
+
 def trading_system_page():
     st.header("Trading System")