feat(xcui): add editor command and menu foundations

tests/UI/Editor/unit/CMakeLists.txt

@@ -2,9 +2,13 @@ set(EDITOR_UI_UNIT_TEST_SOURCES
     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_menu_model.cpp
     test_ui_editor_panel_registry.cpp
     test_ui_editor_collection_primitives.cpp
     test_ui_editor_panel_chrome.cpp
+    test_ui_editor_shortcut_manager.cpp
     test_ui_editor_workspace_controller.cpp
     test_ui_editor_workspace_layout_persistence.cpp
     test_ui_editor_workspace_model.cpp