FIPS nodes carry their fips0 ULA in the saved entry, but it was never
displayed — the only way to learn it was the node itself. Each FIPS
node row in the Nodes page now shows its mesh address as a monospace
subtitle with a tap-to-copy affordance, which is exactly the address
other apps on the phone (Termux ssh over the split tunnel, for
example) need. Non-FIPS entries are unchanged.