fix(counties): make the cluster and the entry panel agree on a US county

An operator asked why K1SEI showed "Middlesex" in Info (F2) and "Lower
Connecticut River Valley" in the cluster. Two sources: the entry panel has
a callbook answer, a spot carries only a callsign so the cluster derives one
from the FCC licence ZIP through GeoNames — and GeoNames has followed the
Census in replacing Connecticut's counties with the 2022 planning regions.
No award, callbook or log uses those, so every CT station matched nothing:
new county for ever, and counting toward nothing.

Measured against a full ULS import (1 556 444 US callsigns), 23 223 resolved
to a name the USA-CA reference does not contain. Three causes, three fixes:

  - Spelling. "City and County of San Francisco", "Baltimore (city)",
    "Nome (CA)", plus counties renamed since the award list was drawn
    (Kusilvak, Oglala Lakota, the Valdez-Cordova split) and Alaska's four
    "X City and Borough", whose reference codes read "JUNEAUCITYAND" because
    the county-type suffix strip eats the wrong end. Normalised in
    award.USCountyKey, which both sides already go through. 7 515 callsigns,
    no re-download needed.

  - Doña Ana, NM shipped into the reference as "NM/DO̱AANA" — mangled by a
    non-UTF-8 CSV line, a code nothing could ever produce, so that county was
    unwinnable and silent about it. Row repaired, cntygen now refuses such a
    line, and a test makes every one of the 3 102 references reproduce its own
    code from its own name.

  - Connecticut. A planning region is drawn from towns in several counties, so
    no name maps to a name — only the ZIP can resolve it. cmd/ctzipgen builds
    the table from the Census 2020 crosswalk, filling PO-box-only ZIPs from the
    nearest resolved centroid; all 11 ZIPs GeoNames still labels with a real
    county agree with the result. 15 037 callsigns, applied at import, so the
    store now carries a rules version and Settings says when a re-download is
    needed.

Alignment itself is the last piece: a spot now shows the county the station is
logged with when we have one, and falls back to the ZIP-derived county only for
stations never worked.

internal/uls/uls.go

@@ -34,6 +34,7 @@ import (
 	"path/filepath"
 	"regexp"
 	"sort"
+	"strconv"
 	"strings"
 	"sync"
 	"time"
@@ -114,6 +115,33 @@ func (s *Store) Count() int {
 	return n
 }
 
+// RulesVersion is bumped whenever a correction applied DURING import changes
+// the county a callsign resolves to. The value is stamped into uls_meta, so a
+// database built by an older OpsLog can be told apart from one built by this
+// one — the rows themselves carry no clue, and the fix cannot be applied
+// retroactively because the ZIP each county was derived from is not stored.
+//
+//	1 — original.
+//	2 — Connecticut ZIPs mapped back to their legal county instead of the
+//	    2022 planning region GeoNames now reports (see ctcounty_gen.go).
+const RulesVersion = 2
+
+// NeedsRefresh reports that the store was built before a correction that
+// changes its answers, so the operator should download it again. False for an
+// empty store: there is nothing stale about data that was never fetched.
+func (s *Store) NeedsRefresh() bool {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	var n int
+	if s.db.QueryRow(`SELECT COUNT(*) FROM uls_callsign`).Scan(&n); n == 0 {
+		return false
+	}
+	var v string
+	s.db.QueryRow(`SELECT value FROM uls_meta WHERE key='rules_version'`).Scan(&v)
+	got, _ := strconv.Atoi(v)
+	return got < RulesVersion
+}
+
 // UpdatedAt returns when the store was last imported (zero if never).
 func (s *Store) UpdatedAt() time.Time {
 	s.mu.RLock()
@@ -285,6 +313,10 @@ func (s *Store) rebuild(ctx context.Context, amatZip string, zipmap map[string]z
 		time.Now().UTC().Format(time.RFC3339)); err != nil {
 		return err
 	}
+	if _, err := tx.ExecContext(ctx, `INSERT OR REPLACE INTO uls_meta(key,value) VALUES('rules_version',?)`,
+		strconv.Itoa(RulesVersion)); err != nil {
+		return err
+	}
 	if err := tx.Commit(); err != nil {
 		return err
 	}
@@ -333,9 +365,21 @@ func parseGeoNames(zipPath string) (map[string]zipRow, error) {
 		}
 		lat := parseFloat(f[9])
 		lon := parseFloat(f[10])
+		state := strings.ToUpper(strings.TrimSpace(f[4]))
+		county := strings.TrimSpace(f[5])
+		// Connecticut: GeoNames reports the 2022 planning regions, which are
+		// county-equivalents for the Census and nothing at all for amateur
+		// radio — no award, no callbook and no log uses them, so every CT
+		// station resolved to a name that matched nothing. Substitute the legal
+		// county for the ZIP. See cmd/ctzipgen.
+		if state == "CT" {
+			if c, ok := ctCounty[zip5]; ok {
+				county = c
+			}
+		}
 		out[zip5] = zipRow{
-			state:  strings.ToUpper(strings.TrimSpace(f[4])),
-			county: strings.TrimSpace(f[5]),
+			state:  state,
+			county: county,
 			lat:    lat,
 			lon:    lon,
 		}