Add day amplitude metric (high-low range and percent).

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

desktop/gold_order_app.py

@@ -811,6 +811,7 @@ class OrderApp(tk.Tk):
         self._metric_box(metrics, "open", "开盘价")
         self._metric_box(metrics, "high", "最高价")
         self._metric_box(metrics, "low", "最低价")
+        self._metric_box(metrics, "range", "振幅")
         self.lbl_day_ohlc = tk.Label(
             q, text="", bg=COLOR_CARD, fg=COLOR_MUTED, font=("Microsoft YaHei UI", 10),
         )
@@ -1484,6 +1485,14 @@ class OrderApp(tk.Tk):
                 self._set_metric("open", f"{day['open']:.{digits}f}")
                 self._set_metric("high", f"{day['high']:.{digits}f}", COLOR_PROFIT)
                 self._set_metric("low", f"{day['low']:.{digits}f}", COLOR_LOSS)
+                amp = float(day["high"]) - float(day["low"])
+                base = float(day["open"]) or float(day["low"]) or 1.0
+                amp_pct = (amp / base) * 100.0 if base else 0.0
+                self._set_metric(
+                    "range",
+                    f"{amp:.{digits}f}  ({amp_pct:.2f}%)",
+                    COLOR_ACCENT,
+                )
                 ot = day["open_time"].strftime("%m-%d %H:%M")
                 tag = "交易中" if day["market_open"] else "休市 · 显示最近交易日"
                 self.lbl_day_ohlc.configure(text=f"{tag}  ·  日线开盘 {ot}")
@@ -1492,6 +1501,7 @@ class OrderApp(tk.Tk):
                 self._set_metric("open", "--")
                 self._set_metric("high", "--")
                 self._set_metric("low", "--")
+                self._set_metric("range", "--")
                 self.lbl_day_ohlc.configure(text="日线暂不可用（休市也会尽量显示最近交易日）")
             try:
                 self._refresh_today_stats(symbol)
@@ -1513,6 +1523,14 @@ class OrderApp(tk.Tk):
                 self._set_metric("open", f"{day['open']:.{digits}f}")
                 self._set_metric("high", f"{day['high']:.{digits}f}", COLOR_PROFIT)
                 self._set_metric("low", f"{day['low']:.{digits}f}", COLOR_LOSS)
+                amp = float(day["high"]) - float(day["low"])
+                base = float(day["open"]) or float(day["low"]) or 1.0
+                amp_pct = (amp / base) * 100.0 if base else 0.0
+                self._set_metric(
+                    "range",
+                    f"{amp:.{digits}f}  ({amp_pct:.2f}%)",
+                    COLOR_ACCENT,
+                )
                 self.lbl_session.configure(text="时段 休市", bg="#3a2820", fg=COLOR_WARN)
                 self.lbl_day_ohlc.configure(text="休市 · 显示最近交易日日线")
             except Exception: