feat(hub): show floating PnL on market page and drag stop-loss to place TP/SL

Pass unrealized PnL from monitor jump context, refresh from board snapshot, and let users drag the SL price line to call the same place-tpsl API as the monitor entrust dialog.

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

manual_trading_hub/static/app.css

@@ -2940,6 +2940,19 @@ body.login-page {
   padding: 2px 8px;
 }
 
+.market-pos-pnl {
+  font-weight: 700;
+  font-variant-numeric: tabular-nums;
+}
+
+.market-pos-pnl.pnl-up {
+  color: #3ddc84;
+}
+
+.market-pos-pnl.pnl-down {
+  color: #ff7070;
+}
+
 .market-pos-panel .ohlcv-item {
   font-weight: 600;
   color: var(--text);
@@ -3283,6 +3296,14 @@ html[data-theme="light"] .market-pos-order-price {
   color: #9a6b10;
 }
 
+html[data-theme="light"] .market-pos-pnl.pnl-up {
+  color: #0a7a3d;
+}
+
+html[data-theme="light"] .market-pos-pnl.pnl-down {
+  color: #c62828;
+}
+
 html[data-theme="light"] .market-pos-clear {
   font-weight: 600;
   color: var(--text);