[Feature Request]: Show keybinds with invalid commands in keybindings page.

While being grayed out, showing that it's not active and users can't edit it, but they can delete its combo or reset it.

See https://github.com/Comfy-Org/ComfyUI_frontend/issues/2407#issuecomment-2798154010.

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-3415-Feature-Request-Show-keybinds-with-invalid-commands-in-keybindings-page-1d36d73d365081ad8a1df98652a247fb) by [Unito](https://www.unito.io)