feat: Load open trades from journal into portfolio on initialization

src/streamlit_app.py

@@ -587,6 +587,19 @@ def trading_system_page():
         # Initialize portfolio if not in session state
         if 'portfolio' not in st.session_state:
             st.session_state.portfolio = Portfolio()
+            
+            # Load existing open trades into portfolio
+            open_trades = get_open_trades()
+            for trade in open_trades:
+                position = Position(
+                    symbol=trade['ticker'],
+                    entry_date=trade['entry_date'],
+                    entry_price=trade['entry_price'],
+                    shares=trade['shares'],
+                    stop_loss=trade['stop_loss'],
+                    target_price=trade['target_price']
+                )
+                st.session_state.portfolio.add_position(position)
         
         # Add position form
         with st.expander("Add New Position"):