fix(adif): CNTY must be STATE,COUNTY

ADIF defines CNTY as "STATE,COUNTY" — "GA,BARROW". OpsLog wrote the bare county
name, which a receiving logger cannot resolve: county names repeat across
states, and there is a Washington County in thirty of them. The award engine
here was never affected, since it reads the columns rather than the ADIF; the
damage was to every file we hand to someone else.

One writer covers everything — writeRecord — so this fixes file exports and the
LoTW, Club Log, HRDLog and QRZ uploads together. MY_CNTY gets the same
treatment.

The county alone is still written when no state is known: a bare name is worth
more than nothing, and inventing a prefix would be worse than either. A value
that already carries a comma passes through untouched, so re-exporting an
imported record cannot double the prefix.

Import is the mirror: "GA,BARROW" fills both columns, and a file carrying the
bare county — as OpsLog's own older exports do — still imports unchanged. The
state parsed out of CNTY only fills a blank STATE, never overrides it: STATE is
the dedicated field and the more specific statement.

internal/adif/import.go

@@ -428,7 +428,12 @@ func recordToQSO(rec Record) (qso.QSO, bool) {
 	q.VUCCGrids = strings.ToUpper(rec["vucc_grids"])
 	q.Country = rec["country"]
 	q.State = strings.ToUpper(rec["state"])
-	q.County = rec["cnty"]
+	q.County, _ = splitADIFCounty(rec["cnty"])
+	if st := rec["state"]; strings.TrimSpace(st) == "" {
+		if _, fromCnty := splitADIFCounty(rec["cnty"]); fromCnty != "" {
+			q.State = fromCnty
+		}
+	}
 	if v, ok := parseInt(rec["dxcc"]); ok {
 		q.DXCC = &v
 	}
@@ -515,7 +520,12 @@ func recordToQSO(rec Record) (qso.QSO, bool) {
 	q.MyGridExt = strings.ToUpper(rec["my_gridsquare_ext"])
 	q.MyCountry = rec["my_country"]
 	q.MyState = strings.ToUpper(rec["my_state"])
-	q.MyCounty = rec["my_cnty"]
+	q.MyCounty, _ = splitADIFCounty(rec["my_cnty"])
+	if st := rec["my_state"]; strings.TrimSpace(st) == "" {
+		if _, fromCnty := splitADIFCounty(rec["my_cnty"]); fromCnty != "" {
+			q.MyState = fromCnty
+		}
+	}
 	q.MyIOTA = strings.ToUpper(rec["my_iota"])
 	q.MySOTARef = strings.ToUpper(rec["my_sota_ref"])
 	q.MyPOTARef = strings.ToUpper(rec["my_pota_ref"])
@@ -698,3 +708,20 @@ var promotableSubmodes = map[string]bool{
 func submodeSubsumesParent(submode string) bool {
 	return promotableSubmodes[submode]
 }
+
+// splitADIFCounty reads CNTY, which ADIF defines as "STATE,COUNTY".
+//
+// Returns the county on its own plus the state the field carried, so an import
+// from a logger that follows the standard fills BOTH columns here. Files that
+// write the bare county — as OpsLog itself used to — still import unchanged.
+//
+// The state from the field never overrides an explicit STATE tag: STATE is the
+// dedicated field and the more specific statement. It only fills a blank.
+func splitADIFCounty(cnty string) (county, state string) {
+	cnty = strings.TrimSpace(cnty)
+	i := strings.Index(cnty, ",")
+	if i < 0 {
+		return cnty, ""
+	}
+	return strings.TrimSpace(cnty[i+1:]), strings.ToUpper(strings.TrimSpace(cnty[:i]))
+}