feat(custom-widgets): improve authoring workbench (#6689)

* feat(custom-widgets): improve authoring workbench

* fix(custom-widgets): address review and CI

* refactor(custom-widgets): satisfy architecture checks

* fix(custom-widgets): isolate workbench typing updates

* fix(custom-widgets): harden workbench state

packages/custom-widgets/src/workbench/code-editor-toolbar.tsx

@@ -63,6 +63,7 @@ export function CodeEditorToolbar({
               leftSection={<IconArrowBackUp size={14} />}
               onClick={onUndo}
               disabled={!editorCreated || historyDepth.undo === 0}
+              aria-keyshortcuts="Control+Z Meta+Z"
             >
               {props.messages.undo}
             </Button>
@@ -73,6 +74,7 @@ export function CodeEditorToolbar({
               leftSection={<IconArrowForwardUp size={14} />}
               onClick={onRedo}
               disabled={!editorCreated || historyDepth.redo === 0}
+              aria-keyshortcuts="Control+Shift+Z Meta+Shift+Z"
             >
               {props.messages.redo}
             </Button>