Two issues from the first derived-regions pass:
- The 'Resolving N...' counter only updated when the whole pass finished, so it
looked frozen. fillDerivedRegions now reports progress per pin, the hook ticks
the counter down, and the card refreshes every 5 resolved pins so the numbers
climb while you watch.
- A country could appear twice ('United Kingdom' 1 + 1) when one pin carried a
country_code and another only a name. Learn name->code from pins that have
both and fold name-only pins into the same bucket.
The region card only placed pins carrying a city/country tag, so legacy pins
(coords but no tag) drew on the map yet landed in 'Uncategorised' — the map and
the stats disagreed. useGrowthStats now falls back to a cached reverse geocode
of the pin's own coordinates (lib/derivedRegions, localStorage keyed by ~110m
coords). useDeriveRegions (mounted on /stats) fills cache misses at 1.1s spacing
for Nominatim's 1 req/s policy and invalidates growth-stats; the card shows a
'Resolving N...' note meanwhile. Display-only fallback; the admin backfill still
writes real tags. Read-time geocoding disclosed on /privacy.
