network: traffic, its busiest processes and the IPs on the page

The rx/tx graph, the LAN address and the public IP with its pin move from
the perf page's NET card to the network page, where they belong; the NET
card is gone. Perf still samples and owns all of them: the graph opens on
the last minute of history, and a public IP that differs from the pin
still lights the perf tile's dot.

Below the graph, the five busiest processes. nethogs is installed but
cannot open any interface unprivileged, so the rates come from
`ss -tinpH`: per-socket byte counters diffed every 2s while the page is
open, summed by process name. That counts TCP only, and only the user's
own processes, so QUIC and system services are missing. The list is held
at five rows tall so the IP lines under it never move.

Perf.js gains sockets() and netProcs(), with tests in test_perf.js.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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