context-menu: render toggle/selected menu items, rename internal dispatcher

- actions gain optional toggle + selected fields: items render in the shared
  tp-popup-menu-item checkmark style (icon faded unless selected/hovered)
- rename the private _onCtxAction dispatcher to _ctxItemClicked so a host
  method named _onCtxAction (the natural name for a ctx-action listener)
  no longer shadows it and breaks item clicks

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@tp/helpers",
-  "version": "2.13.0",
+  "version": "2.14.0",
   "description": "",
   "main": "closest.js",
   "scripts": {