feat: compact instance toolbar, stats strip and settings two-column layout

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

lib/instance/instance_live_pnl_lib.py

@@ -0,0 +1,32 @@
+"""实例页：持仓未实现盈亏（实时盈亏）汇总。"""
+from __future__ import annotations
+
+from collections.abc import Callable
+from typing import Any
+
+from lib.hub.hub_monitor_totals_lib import position_unrealized_pnl
+
+
+def _position_contracts(pos: dict[str, Any]) -> float:
+    try:
+        return abs(float(pos.get("contracts") or 0))
+    except (TypeError, ValueError):
+        return 0.0
+
+
+def sum_unrealized_pnl_from_positions(positions: list[dict[str, Any]] | None) -> float:
+    total = 0.0
+    for p in positions or []:
+        if not isinstance(p, dict):
+            continue
+        if _position_contracts(p) <= 1e-12:
+            continue
+        total += position_unrealized_pnl(p)
+    return round(total, 2)
+
+
+def fetch_unrealized_pnl(fetch_positions_fn: Callable[[], list[dict[str, Any]] | None]) -> float | None:
+    try:
+        return sum_unrealized_pnl_from_positions(fetch_positions_fn() or [])
+    except Exception:
+        return None