三维显示与二维共用深度色标，配置名改为 Finger

箭头阈值写入设置；去掉网格告警。三维色标改为立刻采用二维量程（不再 P5/P95 缓变）。选择器显示 Finger。已用 pane UI、shared-scale 与 catalog 单测验证。

apps/studio/tests/test_scene3d_pane_ui.py

@@ -129,6 +129,21 @@ def test_arrow_threshold_round_trips_and_feeds_the_shared_policy(panel):
     assert policy_for_settings(again).flow_on_px == pytest.approx(0.9)
 
 
+def test_depth_legend_follows_the_shared_2d_span_immediately(panel):
+    """The 3D colour-bar numbers are the 2D span, not a lagged GL automatic range."""
+    from orisys_app_shared.scene3d.contracts import FieldDescriptor, RenderStats
+
+    panel.set_descriptor(
+        FieldDescriptor("depth_response", "1", "approximate", False)
+    )
+    panel.set_render_stats(
+        RenderStats(scale_lower=0.0, scale_upper=0.0489, scale_mode="automatic")
+    )
+    panel.set_shared_depth_scale((0.0, 0.029))
+    assert panel.scale_lower_label.text() == "0.000"
+    assert panel.scale_upper_label.text() == "0.029"
+
+
 def test_source_kind_analysis_uses_its_own_label(panel):
     """A stored result is not labelled as live acquisition."""
     panel.set_diagnostics_visible(True)
@@ -241,8 +256,8 @@ def test_the_diagnostics_switch_governs_what_the_pane_explains(panel):
     )
     panel.set_diagnostics_visible(False)
     assert not panel.scale_bar.isHidden()
-    assert panel.scale_lower_label.text() == "0.25"
-    assert panel.scale_upper_label.text() == "2.5"
+    assert panel.scale_lower_label.text() == "0.250"
+    assert panel.scale_upper_label.text() == "2.500"
     assert not panel.scale_lower_label.isHidden()
     assert not panel.scale_upper_label.isHidden()
     assert panel.legend_label.isHidden()