It doesn't add much over the button state and the button tooltip (note that the state isn't even displayed when the cursor is over an axes, as the coordinates take precedence), and collides with other possible end-user customizations of the toolbar (currently, end-users can override the coordinate string via format_coord, but not the navigate mode string).

Closes #24867.

PR Summary

PR Checklist

Documentation and Tests

• Has pytest style unit tests (and pytest passes)
• Documentation is sphinx and numpydoc compliant (the docs should build without error).
• New plotting related features are documented with examples.

Release Notes

• New features are marked with a .. versionadded:: directive in the docstring and documented in doc/users/next_whats_new/
• API changes are marked with a .. versionchanged:: directive in the docstring and documented in doc/api/next_api_changes/
• Release notes conform with instructions in next_whats_new/README.rst or next_api_changes/README.rst