fix(hub): recalc market floating PnL from live chart mark

Use plan margin x leverage x price change with latest K-line close instead of stale board snapshot floating_pnl.

Co-authored-by: Cursor <cursoragent@cursor.com>

manual_trading_hub/static/app.js

@@ -1380,7 +1380,15 @@
     const planMargin =
       trendPlan && trendPlan.plan_margin_capital != null
         ? num(trendPlan.plan_margin_capital)
-        : null;
+        : mo.margin_capital != null
+          ? num(mo.margin_capital)
+          : null;
+    const leverage =
+      trendPlan && trendPlan.leverage != null
+        ? num(trendPlan.leverage)
+        : mo.leverage != null
+          ? num(mo.leverage)
+          : null;
     return {
       exchange_id: exchangeId || null,
       symbol: (pos.symbol || "").trim(),
@@ -1394,6 +1402,7 @@
       unrealized_pnl: upnl != null ? Number(upnl) : null,
       notional_usdt: num(pos.notional_usdt),
       plan_margin: planMargin,
+      leverage: leverage,
       orders: orders,
     };
   }