Fix OKX spot swap tgtCcy and show options trading USDT in header.

OKX requires quote_ccy/base_ccy for market orders; include trading_usdt in balance display and total funds.

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

lib/instance/instance_embed_context_lib.py

@@ -103,6 +103,7 @@ def total_funds_usdt(
     options_trading_usdc: float | None = None,
     options_funding_usdc: float | None = None,
     options_funding_usdt: float | None = None,
+    options_trading_usdt: float | None = None,
 ) -> float | None:
     if funding_usdt is None:
         return None
@@ -114,6 +115,8 @@ def total_funds_usdt(
             total += float(options_funding_usdt)
         if options_trading_usdc is not None:
             total += float(options_trading_usdc)
+        if options_trading_usdt is not None:
+            total += float(options_trading_usdt)
         return round(total, 2)
     except (TypeError, ValueError):
         return None