StatusLive had a hand-rolled thousands-separator format_number/1 and a
binary-prefix format_bytes/1 — duplication that was already part of the
review punch-list. Move both to Microwaveprop.Format (which previously
held only distance_km) and delete the local defps. Fourteen call sites
switched to Format.number / Format.bytes.
Also extend the IEM error classifier to snooze on Req.TransportError
{:closed, :timeout, :econnrefused, :nxdomain}. Same rationale as the
429 snooze in batch 1: upstream TCP resets mid-fetch aren't a job
failure, they're transient — returning {:error, _} blows them up into
Oban.PerformError logspam with full stacktraces.
Add Microwaveprop.Format.distance_km/1 and a matching formatDistanceKm
helper for the JS side. Both emit "X mi (Y km)" with one decimal under
10 mi and whole numbers above.
Replace the ad-hoc format_dist/format_km_mi helpers with the shared
formatter and update every user-facing distance render: contact
detail, contacts index column, user profile contact/involving tables,
path finder summary + sounding list, contacts map line popups, beacon
coverage tooltip, and propagation map range estimate + rain scatter
cell popup.
