fix(dashboard): current spread sign for HL→BG positions

Bug: current spread always computed as (hl-bg)/bg regardless of
position direction. For HL→BG positions, spread should be (bg-hl)/hl
to match entry spread convention.

Fix: check LongLeg.Exchange — if HL→BG, use (bg-hl)/hl instead.

dashboard.go

@@ -323,6 +323,10 @@ func (d *Dashboard) broadcastLoop() {
 					netPnl := longPnl + shortPnl - totalFees
 
 					currentSpread := (hlP - bgP) / bgP * 100
+					if pos.LongLeg.Exchange == ExHyperLiquid {
+						// HL→BG: spread positive when bgP > hlP
+						currentSpread = (bgP - hlP) / hlP * 100
+					}
 					posEntry["current_spread"] = math.Round(currentSpread*10000) / 10000
 					posEntry["pnl_est"] = math.Round(netPnl*10000) / 10000
 				}

web/static/app.js

@@ -603,6 +603,10 @@ document.addEventListener('keydown', function(e) {
   if (e.key === 'Escape') closeTradeDetail();
 });
 
+// Expose modal functions to global scope for HTML onclick handlers
+window.openTradeDetail = openTradeDetail;
+window.closeTradeDetail = closeTradeDetail;
+
 // ---- Init ----
 function init() {
   connectSSE();

web/static/style.css

@@ -126,6 +126,7 @@ td {
   white-space: nowrap;
 }
 tr:hover td { background: rgba(88, 166, 255, 0.05); }
+.trade-row { cursor: pointer; }
 .loading { text-align: center; color: var(--text-dim); padding: 20px !important; }
 
 .text-green { color: var(--green); }