This is amazing, I had a bunch of work to do on some remote hosts this night and tried using isd as much as possible, to see how it can help me.

Some feedback :

- it is.. relatively slow ? especially when focusing on different panes (tab/shift+tab). on my machine it takes at least half a second to react

- the unit list is missing page-up/page-down handling

- in some unit attributes, the ordering of some values frequently changes (for example, on unstarted services, in `TriggeredBy`)

- it could be interesting to integrate the output of `systemd-analyse security`

Nice work !