Show keybinding on topbar dropdown menus (#1127)

* Show keybinding on topbar dropdown menus, resolve #1092

* Add text-muted to tailwind config

* Add Playwright test

* Preserve Primevue classes in menu item template

* Extend MenuItem

* Revert adding undo/redo to core keybindings

* Change test selector

* refactor

* Extract as component

* refactor

* nit

* fix extension API

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Co-authored-by: huchenlei <huchenlei@proton.me>

tailwind.config.js

@@ -174,6 +174,10 @@ export default {
           900: '#7b341e',
           950: '#431407'
         }
+      },
+
+      textColor: {
+        muted: 'var(--p-text-muted-color)'
       }
     }
   },