feat(lookup): optional QRZ nickname as the logged name

QRZ publishes <nickname> — the name an operator goes BY on the air — and
OpsLog was composing fname + name instead. "Bob" is what belongs in a log;
"Robert J Smith" is what belongs on a licence.

QRZ only, and deliberately so: HamQTH's <nick> already fills the Name field
that way, so the same switch there would toggle a behaviour it has no way to
turn off.

A published nickname is optional, so an empty one falls through to the
registered name. That is the whole point of it being a fallback rather than a
swap, and it is what the test pins — a blank nickname must never blank the
name.

frontend/src/components/SettingsModal.tsx

@@ -1224,6 +1224,7 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
     hamqth_user: '', hamqth_password: '',
     primary: '', failsafe: '',
     download_images: false,
+    qrz_prefer_nickname: false,
     cache_ttl_days: 30,
   });
   // Per-provider Test state — keeps the success/error feedback adjacent
@@ -2312,6 +2313,23 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
               </span>
             </span>
           </label>
+
+          {/* QRZ only. HamQTH's <nick> already fills the Name field with the
+              on-air name, so the same switch there would toggle a behaviour it
+              has no way to turn off. */}
+          <label className="flex items-start gap-2 text-sm cursor-pointer mt-3">
+            <Checkbox
+              checked={!!(lookup as any).qrz_prefer_nickname}
+              onCheckedChange={(c) => setLookup((s) => ({ ...s, qrz_prefer_nickname: !!c } as any))}
+              className="mt-0.5"
+            />
+            <span>
+              {t('lk.qrzNickname')}
+              <span className="block text-xs text-muted-foreground mt-0.5">
+                {t('lk.qrzNicknameHint')}
+              </span>
+            </span>
+          </label>
         </div>
 
         <div className="mt-6 pt-4 border-t border-border">

frontend/src/lib/i18n.tsx

@@ -243,7 +243,7 @@ const en: Dict = {
   'lk.provider': 'Provider', 'lk.primary': 'Primary', 'lk.failsafe': 'Failsafe', 'lk.user': 'User', 'lk.password': 'Password', 'lk.result': 'Result',
   'lk.testing': 'Testing…', 'lk.test': 'Test', 'lk.testTitle': "Run a sample lookup against the active profile's callsign to verify credentials",
   'lk.failsafeNote': 'Failsafe is consulted only when the Primary returns no match or errors. Set both to none (uncheck) during contests to skip the network entirely.',
-  'lk.display': 'Display', 'lk.showPics': 'Show QRZ profile pictures',
+  'lk.display': 'Display', 'lk.qrzNickname': 'QRZ.com: use the nickname as the name', 'lk.qrzNicknameHint': 'Logs the name the operator goes by on the air rather than their registered first and last name. Falls back to the full name when no nickname is published. QRZ.com only — HamQTH already does this.', 'lk.showPics': 'Show QRZ profile pictures',
   'lk.showPicsHint': 'Display the photo from QRZ.com next to the worked-before matrix. May noticeably slow lookups during busy contest days; turn off if you operate fast.',
   'lk.cache': 'Cache', 'lk.cacheHint': "Successful lookups are cached locally so the same callsign isn't fetched twice. TTL controls how long before a fresh query is made.",
   'lk.ttl': 'TTL (days)', 'lk.clearing': 'Clearing…', 'lk.clearCache': 'Clear cache now',
@@ -666,7 +666,7 @@ const fr: Dict = {
   'lk.provider': 'Fournisseur', 'lk.primary': 'Principal', 'lk.failsafe': 'Secours', 'lk.user': 'Utilisateur', 'lk.password': 'Mot de passe', 'lk.result': 'Résultat',
   'lk.testing': 'Test…', 'lk.test': 'Test', 'lk.testTitle': "Lance une recherche test sur l'indicatif du profil actif pour vérifier les identifiants",
   'lk.failsafeNote': 'Le Secours n\'est consulté que si le Principal ne trouve rien ou échoue. Décoche les deux en contest pour éviter tout accès réseau.',
-  'lk.display': 'Affichage', 'lk.showPics': 'Afficher les photos de profil QRZ',
+  'lk.display': 'Affichage', 'lk.qrzNickname': 'QRZ.com : utiliser le surnom comme nom', 'lk.qrzNicknameHint': "Enregistre le nom sous lequel l'opérateur se présente à l'air plutôt que ses prénom et nom déclarés. Retombe sur le nom complet si aucun surnom n'est publié. QRZ.com uniquement — HamQTH le fait déjà.", 'lk.showPics': 'Afficher les photos de profil QRZ',
   'lk.showPicsHint': 'Affiche la photo de QRZ.com à côté de la matrice « déjà contacté ». Peut ralentir les recherches en contest ; désactive si tu opères vite.',
   'lk.cache': 'Cache', 'lk.cacheHint': "Les recherches réussies sont mises en cache localement pour ne pas re-interroger le même indicatif. Le TTL contrôle la durée avant une nouvelle requête.",
   'lk.ttl': 'TTL (jours)', 'lk.clearing': 'Effacement…', 'lk.clearCache': 'Vider le cache',