feat(counties): right-click to re-derive a US county from the ULS database

The automatic pass fills a blank county only, and deliberately: a value the
operator or QRZ supplied usually beats one derived from a ZIP code. That leaves
no way at all to correct a county already stored — and the Connecticut planning
regions are exactly that case. Every CT contact logged before that correction
holds a county the state abolished in 2022, and filling blanks never reaches
one of them.

So the new entry OVERWRITES, because it is asked for by hand on a chosen set of
rows precisely because the stored value is believed wrong. Only US entities are
touched, only callsigns the database holds, and only when the answer actually
differs — so re-running it on a mixed selection is safe and the count reported
is the number of counties that really changed. Award refs are re-materialised:
the county IS the reference for CQ USA-CA and the state for WAS.

The entry appears only once the database has been downloaded, and appears
without a restart when one finishes — an action that can only ever answer "no
database" is not worth a line in a menu this long.

frontend/src/lib/i18n.tsx

@@ -420,7 +420,7 @@ const en: Dict = {
   'awed.importReplace': 'Replace mine',
   'awed.importCopy': 'Import as {code}-2',
   // QSO modals (context menu / bulk edit / QSL manager / QSO edit)
-  'qctx.selected': '{n} QSO(s) selected', 'qctx.fixCountry': 'Fix country & zones from cty.dat', 'qctx.updateQrz': 'Update from the callsign databases', 'qctx.updateClublog': 'Update from ClubLog (exceptions)', 'qctx.sendQslEmail': 'Send OpsLog QSL by e-mail', 'qctx.sendRecording': 'Send recording by e-mail', 'qctx.bulkEdit': 'Bulk edit field… ({n})', 'qctx.exportSelectedAdif': 'Export selected to ADIF ({n})', 'qctx.exportSelectedFields': 'Export selected — choose fields… ({n})', 'qctx.exportFilteredAdif': 'Export filtered view to ADIF (no limit)', 'qctx.exportSelectedCabrillo': 'Export selected to Cabrillo ({n})', 'qctx.exportFilteredCabrillo': 'Export filtered view to Cabrillo (no limit)', 'qctx.sendTo': 'Send to {name}', 'qctx.delete': 'Delete {n} QSO(s)…',
+  'qctx.selected': '{n} QSO(s) selected', 'qctx.fixCountry': 'Fix country & zones from cty.dat', 'qctx.updateQrz': 'Update from the callsign databases', 'qctx.updateClublog': 'Update from ClubLog (exceptions)', 'qctx.updateUlsCounty': 'Update US county from the ULS database', 'qctx.updateUlsCountyTitle': 'Re-derives the county of the selected US contacts from the downloaded ULS database, replacing what is stored. Contacts outside the US, and callsigns the database does not hold, are left alone.', 'qctx.fromUlsLabel': 'from the ULS database', 'qctx.sendQslEmail': 'Send OpsLog QSL by e-mail', 'qctx.sendRecording': 'Send recording by e-mail', 'qctx.bulkEdit': 'Bulk edit field… ({n})', 'qctx.exportSelectedAdif': 'Export selected to ADIF ({n})', 'qctx.exportSelectedFields': 'Export selected — choose fields… ({n})', 'qctx.exportFilteredAdif': 'Export filtered view to ADIF (no limit)', 'qctx.exportSelectedCabrillo': 'Export selected to Cabrillo ({n})', 'qctx.exportFilteredCabrillo': 'Export filtered view to Cabrillo (no limit)', 'qctx.sendTo': 'Send to {name}', 'qctx.delete': 'Delete {n} QSO(s)…',
   'exp.title': 'Export to ADIF', 'exp.desc': 'Choose which fields to write.',
   'exp.stdTitle': 'Standard ADIF fields', 'exp.stdDesc': 'Official ADIF 3.1.7 fields only — best for uploading to other logbooks (LoTW, QRZ, Club Log…).',
   'exp.allTitle': 'All OpsLog fields', 'exp.allDesc': 'Everything, including OpsLog-specific and app-defined tags — a full backup you can re-import here.',
@@ -836,7 +836,7 @@ const fr: Dict = {
   'awed.importKeepMine': 'Garder le mien',
   'awed.importReplace': 'Remplacer le mien',
   'awed.importCopy': 'Importer en {code}-2',
-  'qctx.selected': '{n} QSO sélectionné(s)', 'qctx.fixCountry': 'Corriger pays et zones depuis cty.dat', 'qctx.updateQrz': 'Mettre à jour depuis les annuaires', 'qctx.updateClublog': 'Mettre à jour depuis ClubLog (exceptions)', 'qctx.sendQslEmail': 'Envoyer la QSL OpsLog par e-mail', 'qctx.sendRecording': "Envoyer l'enregistrement par e-mail", 'qctx.bulkEdit': "Édition groupée d'un champ… ({n})", 'qctx.exportSelectedAdif': 'Exporter la sélection en ADIF ({n})', 'qctx.exportFilteredAdif': 'Exporter la vue filtrée en ADIF (sans limite)', 'qctx.exportSelectedCabrillo': 'Exporter la sélection en Cabrillo ({n})', 'qctx.exportFilteredCabrillo': 'Exporter la vue filtrée en Cabrillo (sans limite)', 'qctx.sendTo': 'Envoyer vers {name}', 'qctx.delete': 'Supprimer {n} QSO…',
+  'qctx.selected': '{n} QSO sélectionné(s)', 'qctx.fixCountry': 'Corriger pays et zones depuis cty.dat', 'qctx.updateQrz': 'Mettre à jour depuis les annuaires', 'qctx.updateClublog': 'Mettre à jour depuis ClubLog (exceptions)', 'qctx.updateUlsCounty': 'Mettre à jour le comté US depuis la base ULS', 'qctx.updateUlsCountyTitle': 'Recalcule le comté des contacts US sélectionnés depuis la base ULS téléchargée, en remplaçant la valeur enregistrée. Les contacts hors US et les indicatifs absents de la base ne sont pas touchés.', 'qctx.fromUlsLabel': 'depuis la base ULS', 'qctx.sendQslEmail': 'Envoyer la QSL OpsLog par e-mail', 'qctx.sendRecording': "Envoyer l'enregistrement par e-mail", 'qctx.bulkEdit': "Édition groupée d'un champ… ({n})", 'qctx.exportSelectedAdif': 'Exporter la sélection en ADIF ({n})', 'qctx.exportFilteredAdif': 'Exporter la vue filtrée en ADIF (sans limite)', 'qctx.exportSelectedCabrillo': 'Exporter la sélection en Cabrillo ({n})', 'qctx.exportFilteredCabrillo': 'Exporter la vue filtrée en Cabrillo (sans limite)', 'qctx.sendTo': 'Envoyer vers {name}', 'qctx.delete': 'Supprimer {n} QSO…',
   'exp.title': 'Exporter en ADIF', 'exp.desc': 'Choisissez les champs à écrire.',
   'exp.stdTitle': 'Champs ADIF standard', 'exp.stdDesc': 'Uniquement les champs officiels ADIF 3.1.7 — idéal pour l’envoi vers d’autres carnets (LoTW, QRZ, Club Log…).',
   'exp.allTitle': 'Tous les champs OpsLog', 'exp.allDesc': 'Tout, y compris les champs spécifiques à OpsLog et les balises applicatives — une sauvegarde complète ré-importable ici.',