The sidebar hides what the caller cannot reach - that is what makes it useful
to a guest, and what stops a member with a sparse role being offered links that
can only answer 403. It reads the permission off the nav item to decide.
Only four items ever declared one. Machines, PCs, Printers, Network, USB,
Knowledge Base, Notifications, Calendar, Dashboard, Map, Applications and
Reports declared nothing, so the filter had nothing to go on: granting the
guest role machines.view opened the API and left the sidebar empty, which reads
as the grant not working.
Every item now names its read permission - in the plugins, in the core
navigation endpoint, and in the frontend's fallback list, which is what renders
when the endpoint is unreachable and would otherwise disagree with it.
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