fix: Handle empty stats in get_daily_summary

Added .get() with defaults for total_trades, win_rate, and total_profit
to prevent KeyError when no trades have been logged yet.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

demo_test_tracker.py

@@ -547,11 +547,15 @@ class DemoTestTracker:
         today_wins = sum(1 for t in today_trades if t['is_win'])
         today_wr = today_wins / len(today_trades) * 100 if today_trades else 0
 
+        total_trades = stats.get('total_trades', 0)
+        win_rate = stats.get('win_rate', 0)
+        total_profit = stats.get('total_profit', 0)
+
         summary = f"""
 📊 Daily Summary - {today}
 ━━━━━━━━━━━━━━━━━━━━━━━━━━━
 Today:    {len(today_trades)} trades | {today_wins} wins | WR: {today_wr:.0f}% | P/L: ${today_profit:+.2f}
-Overall:  {stats['total_trades']} trades | WR: {stats['win_rate']*100:.1f}% | Total: ${stats['total_profit']:+.2f}
+Overall:  {total_trades} trades | WR: {win_rate*100:.1f}% | Total: ${total_profit:+.2f}
 ━━━━━━━━━━━━━━━━━━━━━━━━━━━
 """
         return summary