refactor(new_editor): tighten app dependency boundaries

tests/UI/Editor/unit/CMakeLists.txt

@@ -1,8 +1,5 @@
 set(EDITOR_UI_UNIT_TEST_SOURCES
-    test_editor_host_command_bridge.cpp
-    test_editor_shell_asset_validation.cpp
     test_input_modifier_tracker.cpp
-    test_structured_editor_shell.cpp
     test_ui_editor_command_dispatcher.cpp
     test_ui_editor_command_registry.cpp
     test_ui_editor_dock_host_interaction.cpp
@@ -12,13 +9,12 @@ set(EDITOR_UI_UNIT_TEST_SOURCES
     test_ui_editor_menu_popup.cpp
     test_ui_editor_panel_content_host.cpp
     test_ui_editor_panel_host_lifecycle.cpp
-    test_ui_editor_panel_registry.cpp
     test_ui_editor_property_grid.cpp
     test_ui_editor_property_grid_interaction.cpp
     test_ui_editor_shell_compose.cpp
-    test_editor_window_input_routing.cpp
     test_ui_editor_shell_interaction.cpp
     test_ui_editor_collection_primitives.cpp
+    test_ui_editor_drag_drop.cpp
     test_ui_editor_field_row_layout.cpp
     test_ui_editor_hosted_field_builders.cpp
     test_ui_editor_bool_field.cpp
@@ -53,7 +49,6 @@ set(EDITOR_UI_UNIT_TEST_SOURCES
     test_ui_editor_tab_strip_interaction.cpp
     test_ui_editor_tree_view.cpp
     test_ui_editor_tree_view_interaction.cpp
-    test_viewport_object_id_picker.cpp
     test_ui_editor_viewport_input_bridge.cpp
     test_ui_editor_viewport_shell.cpp
     test_ui_editor_viewport_slot.cpp
@@ -79,7 +74,6 @@ target_link_libraries(editor_ui_tests
 target_include_directories(editor_ui_tests
     PRIVATE
         ${XCENGINE_EDITOR_UI_TESTS_EDITOR_ROOT}/include
-        ${XCENGINE_EDITOR_UI_TESTS_EDITOR_ROOT}
         ${CMAKE_SOURCE_DIR}/engine/include
 )
 
@@ -119,6 +113,15 @@ if(TARGET XCUIEditorAppLib)
         )
     endif()
 
+    list(APPEND EDITOR_APP_FEATURE_TEST_SOURCES
+        test_editor_host_command_bridge.cpp
+        test_editor_shell_asset_validation.cpp
+        test_structured_editor_shell.cpp
+        test_editor_window_input_routing.cpp
+        test_ui_editor_panel_registry.cpp
+        test_viewport_object_id_picker.cpp
+    )
+
     add_executable(editor_app_feature_tests
         ${EDITOR_APP_FEATURE_TEST_SOURCES}
     )
@@ -126,6 +129,7 @@ if(TARGET XCUIEditorAppLib)
     target_link_libraries(editor_app_feature_tests
         PRIVATE
             XCUIEditorAppLib
+            XCUIEditorAppCore
             XCUIEditorLib
             XCUIEditorHost
             GTest::gtest_main