[toolpad-core] Add support for external links in dashboard navigation

[l-astro]

Summary

It would be great to include support for external links in the navigation component; perhaps add a new NavigationExternal type to be added to NavigationItem?

Examples

No response

Motivation

We have several services that are as yet outside of the mui framework but the user needs visibility of them in the dashboard nav. We would like these to be nested under a single item e.g., ExternalServices > ExternalService1, ExternalService2... Currently the breadcrumbs gets muddled if these external href are child items, as the NAVIGATION expects a segment property and concatenates this string to the href.

Search keywords: navigation, routing, external link

[apedroferreira]

Sounds like a useful feature!
We could add something like a path or href property to navigation page items, where any path supported by a typical href attribute could be used as a string. This property would take priority over segments.

[Janpot]

Or alternatively, a renderItem prop to open up more options of customization, analog to DataGrid renderCell.