test(tree): cover L1 entity fields and block ordering in view_node

tests/unit/test_tree_environment.py

@@ -414,3 +414,10 @@ class TestNodeEntityFields:
         env = TreeEnvironment(_make_entity_test_index())
         with pytest.raises(KeyError):
             env.node_entity_fields("nonexistent")
+
+    def test_l1_key_entities(self) -> None:
+        """L1 节点应返回 key_entities 原文；visible_text 为空时省键。"""
+        env = TreeEnvironment(_make_entity_test_index())
+        fields = env.node_entity_fields("vid_L1_000")
+        assert "reviewer" in fields["实体"]
+        assert "画面文字" not in fields