fix: Update stop loss calculation to use correct entry price attribute

src/pages/backtesting/backtesting_page.py

@@ -103,7 +103,7 @@ class DynamicStrategy(Strategy):
         if self.position and self.position.size > 0:  # Make sure we have an active position
             try:
                 # Calculate the percentage loss from entry
-                entry_price = self.position.entry_price  # Access as property
+                entry_price = self.position.entry  # Changed from entry_price to entry
                 current_loss = ((price - entry_price) / entry_price) * 100
                 
                 # If loss exceeds 7%, close the position