refactor: Update total portfolio value display to show cash and positions

src/pages/journal/trading_journal_page.py

@@ -273,7 +273,7 @@ def trading_journal_page():
 
                 st.metric("Total Portfolio Value", 
                          f"${total_portfolio_value:,.2f}",
-                         f"${total_paper_pl:,.2f} P/L" if total_paper_pl != 0 else None)
+                         f"Cash: ${cash_balance:,.2f} | Positions: ${total_invested_value:,.2f}")
 
             with col2:
                 # Weekly metrics