feat: Add distinction between regular SL and trailing SL

User Request: Distinguish between SL and Trailing SL in analytics overview

Changes:
1. Position Manager:
   - Updated ExitResult interface to include 'TRAILING_SL' exit reason
   - Modified trailing stop exit (line 1457) to use 'TRAILING_SL' instead of 'SL'
   - Enhanced external closure detection (line 937) to identify trailing stops
   - Updated handleManualClosure to detect trailing SL at price target

2. Database:
   - Updated UpdateTradeExitParams interface to accept 'TRAILING_SL'

3. Frontend Analytics:
   - Updated last trade display to show 'Trailing SL' with special formatting
   - Purple background/border for TRAILING_SL vs blue for regular SL
   - Runner emoji (🏃) prefix for trailing stops

Impact:
- Users can now see when trades exit via trailing stop vs regular SL
- Better understanding of runner system performance
- Trailing stops visually distinct in analytics dashboard

Files Modified:
- lib/trading/position-manager.ts (4 locations)
- lib/database/trades.ts (UpdateTradeExitParams interface)
- app/analytics/page.tsx (exit reason display)
- .github/copilot-instructions.md (Common Pitfalls #61, #62)

lib/database/trades.ts

@@ -82,7 +82,7 @@ export interface UpdateTradeStateParams {
 export interface UpdateTradeExitParams {
   positionId: string
   exitPrice: number
-  exitReason: 'TP1' | 'TP2' | 'SL' | 'SOFT_SL' | 'HARD_SL' | 'manual' | 'emergency'
+  exitReason: 'TP1' | 'TP2' | 'SL' | 'SOFT_SL' | 'HARD_SL' | 'TRAILING_SL' | 'manual' | 'emergency'
   realizedPnL: number
   exitOrderTx: string
   holdTimeSeconds: number

lib/trading/position-manager.ts

@@ -73,7 +73,7 @@ export interface ActiveTrade {
 
 export interface ExitResult {
   success: boolean
-  reason: 'TP1' | 'TP2' | 'SL' | 'SOFT_SL' | 'HARD_SL' | 'emergency' | 'manual' | 'error'
+  reason: 'TP1' | 'TP2' | 'SL' | 'SOFT_SL' | 'HARD_SL' | 'TRAILING_SL' | 'emergency' | 'manual' | 'error'
   closePrice?: number
   closedSize?: number
   realizedPnL?: number
@@ -176,7 +176,7 @@ export class PositionManager {
     console.log(`👤 Processing manual closure for ${trade.symbol}`)
 
     // Determine exit reason based on price levels
-    let exitReason: 'TP1' | 'TP2' | 'SL' | 'SOFT_SL' | 'HARD_SL' | 'manual' | 'emergency' = 'manual'
+    let exitReason: 'TP1' | 'TP2' | 'SL' | 'SOFT_SL' | 'HARD_SL' | 'TRAILING_SL' | 'manual' | 'emergency' = 'manual'
     const profitPercent = this.calculateProfitPercent(trade.entryPrice, currentPrice, trade.direction)
 
     // Check if price is at TP2 or SL levels
@@ -187,8 +187,14 @@ export class PositionManager {
       exitReason = 'TP2'
       console.log(`✅ Manual closure was TP2 (price at target)`)
     } else if (isAtSL) {
-      exitReason = 'SL'
-      console.log(`🛑 Manual closure was SL (price at target)`)
+      // Check if trailing stop was active
+      if (trade.trailingStopActive && trade.tp2Hit) {
+        exitReason = 'TRAILING_SL'
+        console.log(`🏃 Manual closure was Trailing SL (price at trailing stop target)`)
+      } else {
+        exitReason = 'SL'
+        console.log(`🛑 Manual closure was SL (price at target)`)
+      }
     } else {
       console.log(`👤 Manual closure confirmed (price not at any target)`)
       console.log(`   Current: $${currentPrice.toFixed(4)}, TP1: $${trade.takeProfitPrice1?.toFixed(4)}, TP2: $${trade.takeProfitPrice2?.toFixed(4)}, SL: $${trade.stopLossPrice?.toFixed(4)}`)
@@ -920,7 +926,7 @@ export class PositionManager {
         
         // Determine exit reason from P&L percentage and trade state
         // Use actual profit percent to determine what order filled
-        let exitReason: 'TP1' | 'TP2' | 'SL' | 'SOFT_SL' | 'HARD_SL' = 'SL'
+        let exitReason: 'TP1' | 'TP2' | 'SL' | 'SOFT_SL' | 'HARD_SL' | 'TRAILING_SL' = 'SL'
         
         // CRITICAL (Nov 20, 2025): Check if trailing stop was active
         // If so, this is a trailing stop exit, not regular SL
@@ -934,7 +940,7 @@ export class PositionManager {
             : currentPrice > trade.peakPrice * 1.01 // More than 1% above peak
           
           if (isPullback) {
-            exitReason = 'SL' // Trailing stop counts as SL
+            exitReason = 'TRAILING_SL' // Distinguish from regular SL (Nov 24, 2025)
             console.log(`   ✅ Confirmed: Trailing stop hit (pulled back from peak)`)
           } else {
             // Very close to peak - might be emergency close or manual
@@ -1454,7 +1460,7 @@ export class PositionManager {
         // Check if trailing stop hit
         if (this.shouldStopLoss(currentPrice, trade)) {
           console.log(`🔴 TRAILING STOP HIT: ${trade.symbol} at ${profitPercent.toFixed(2)}%`)
-          await this.executeExit(trade, 100, 'SL', currentPrice)
+          await this.executeExit(trade, 100, 'TRAILING_SL', currentPrice)
           return
         }
       }