fix: Analytics now shows current runner size instead of original position size

- Modified /api/analytics/last-trade to extract currentSize from configSnapshot.positionManagerState
- For open positions (exitReason === null), displays runner size after TP1 instead of original positionSizeUSD
- Falls back to original positionSizeUSD for closed positions or when Position Manager state unavailable
- Fixes UI showing 2.54 when actual runner is 2.59
- Provides accurate exposure visibility on analytics dashboard

Example: Position opens at 2.54, TP1 closes 70% → runner 2.59 → UI now shows 2.59

app/api/analytics/last-trade/route.ts

@@ -18,6 +18,16 @@ export async function GET() {
     }
     
     // Format the trade data for the frontend
+    // For open positions, use currentSize from Position Manager state if available
+    const configSnapshot = trade.configSnapshot as any
+    const positionManagerState = configSnapshot?.positionManagerState
+    const currentSize = positionManagerState?.currentSize
+    
+    // Use currentSize for open positions (after TP1), fallback to original positionSizeUSD
+    const displaySize = trade.exitReason === null && currentSize 
+      ? currentSize 
+      : trade.positionSizeUSD
+    
     const formattedTrade = {
       id: trade.id,
       symbol: trade.symbol,
@@ -29,7 +39,7 @@ export async function GET() {
       exitReason: trade.exitReason || undefined,
       realizedPnL: trade.realizedPnL || undefined,
       realizedPnLPercent: trade.realizedPnLPercent || undefined,
-      positionSizeUSD: trade.positionSizeUSD,
+      positionSizeUSD: displaySize, // Use current size for open positions
       leverage: trade.leverage,
       stopLossPrice: trade.stopLossPrice,
       takeProfit1Price: trade.takeProfit1Price,