The info tool showed both the device config and the node/contact list. Move
the list into a dedicated nodes tool (Device category, right after info) so
each feature does one thing; info now shows identity and radio config only.
- nodes tool renders this node + contacts with the path-hash prefix
highlighted, reading self-info + contacts + path-hash mode directly.
- info drops the contacts read and nodes_table render (and its contacts
summary field); the nodes_table widget and its test are unchanged.
- README: add a Node list feature row.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>