为二维与三维深度色标增加每帧自适应选项。

默认仍锁定本会话首帧，勾选后两视图按当前帧有效深度共用同一范围。已用深度色标与显示设置测试验证。

apps/studio/tests/test_scene3d_view.py

@@ -473,6 +473,7 @@ def test_the_display_settings_round_trip():
         flow_off_px=0.35,
         flow_grid_spacing=12,
         max_arrows=250,
+        depth_scale_adaptive=True,
         color_scale=ColorScale(
             descriptor=FieldDescriptor("flow_magnitude", "px", "approximate", False),
             lower=0.25,
@@ -495,6 +496,8 @@ def test_the_display_settings_round_trip():
     assert restored.color_scale is not None
     assert (restored.color_scale.lower, restored.color_scale.upper) == (0.25, 4.5)
     assert restored.color_scale.mode == "fixed"
+    assert restored.depth_scale_adaptive is True
+    assert scene3d_prefs.settings_from_prefs({}).depth_scale_adaptive is False
 
 
 def test_a_saved_descriptor_is_never_restored_as_a_measurement():