fix: TradeFollowUpPanel property mismatch causing position loading error

- Fix property names: size → amount, pnl → unrealizedPnl
- Update TradePosition interface to match actual API response
- Add missing properties: pnlPercentage, totalValue, timestamp, status, leverage, txId
- Resolves 'Error Loading Positions' issue when accessing marked trades
- Follow-up assistant now properly displays position information

components/TradeFollowUpPanel.tsx

@@ -7,11 +7,16 @@ interface TradePosition {
   side: 'LONG' | 'SHORT'
   entryPrice: number
   currentPrice: number
-  size: number
+  amount: number
-  pnl: number
+  unrealizedPnl: number
+  pnlPercentage: number
+  totalValue: number
   stopLoss?: number
   takeProfit?: number
-  entryTime: string
+  timestamp: number
+  status: string
+  leverage: number
+  txId: string
   entryAnalysis?: string
 }
 
@@ -60,7 +65,7 @@ export default function TradeFollowUpPanel({ onClose }: TradeFollowUpPanelProps)
         setChatMessages([{
           id: Date.now().toString(),
           type: 'system',
-          content: `🎯 **Trade Follow-up Assistant**\n\nI'm here to help you manage your active ${data.positions[0].symbol} ${data.positions[0].side} position.\n\n**Current Position:**\n• Entry: $${data.positions[0].entryPrice}\n• Size: ${data.positions[0].size}\n• Current P&L: ${data.positions[0].pnl > 0 ? '+' : ''}$${data.positions[0].pnl.toFixed(2)}\n\nAsk me anything about your trade!`,
+          content: `🎯 **Trade Follow-up Assistant**\n\nI'm here to help you manage your active ${data.positions[0].symbol} ${data.positions[0].side} position.\n\n**Current Position:**\n• Entry: $${data.positions[0].entryPrice}\n• Size: ${data.positions[0].amount}\n• Current P&L: ${data.positions[0].unrealizedPnl > 0 ? '+' : ''}$${data.positions[0].unrealizedPnl.toFixed(2)}\n\nAsk me anything about your trade!`,
           timestamp: new Date().toISOString()
         }])
       } else {