改为按帧自适应显示 Autocal 深度色阶

从有效 UV 区域计算当前帧范围，排除无效值和区域外像素。57 项定向测试及代码、文档检查通过。

apps/autocal/src/orisys_autocal/ui/finger_source_panel.py

@@ -307,16 +307,19 @@ class FingerSourcePanel(QWidget):
             fresh = (getattr(packet, "depth_valid", None) is True
                      and getattr(packet, "depth_frame_id", None) == packet.frame_id)
             if fresh and depth is not None and np.shape(depth) == frame.shape[:2]:
-                # Fixed scale in SDK divergence units, never millimetres.
-                colored = depth_map_to_bgr(depth, flow_colormap("light"),
-                                           value_range=(0, 1), invalid_mask=mask)
-                if colored is not None:
-                    valid = np.isfinite(depth)
-                    if mask is not None:
-                        valid &= np.asarray(mask, dtype=bool)
+                valid = np.isfinite(depth)
+                if mask is not None:
+                    valid &= np.asarray(mask, dtype=bool)
+                if np.any(valid):
+                    # Adapt to this frame's valid UV region, excluding the exterior.
+                    low, high = float(np.min(depth[valid])), float(np.max(depth[valid]))
+                    colored = depth_map_to_bgr(
+                        np.where(valid, depth, low), flow_colormap("light"),
+                        value_range=(low, high), invalid_mask=valid,
+                    )
                     blended = cv2.addWeighted(frame, .4, colored, .6, 0)
                     frame[valid] = blended[valid]
-                    notes.append(t("feedback.depth_scale"))
+                    notes.append(t("feedback.depth_scale").format(low=low, high=high))
                 else:
                     notes.append(t("feedback.depth_missing"))
             else: