Rework the detection stage

[stgraber]

Based on user feedback, there are two things we should be doing to make the detection stage easier:

• Auto-detect for 5s
• Show a list of detected systems (table), allowing for the user to pick which ones they want to cluster
• Add a hotkey to trigger a clean search (interruptible by the user rather than default 5s)
• Add a hotkey to manually add a machine by its IP address

The table should show hostname, IP and detected services (once we add that to the mix).