fix(qsl): print "TNX QSL" rather than "TNX" on the card

The stamp answers "PSE QSL", so it reads as its counterpart or not at all: a
bare "TNX" next to a QSL message says thanks for something unnamed.

Changed at the source of the {qso.pse_tnx} token, so every card picks it up
with no template edit. The live indicator in the QSO editor and the hint beside
it follow.

frontend/src/components/QSOEditModal.tsx

@@ -435,7 +435,7 @@ export function QSOEditModal({ qso, onSave, onDelete, onClose, countries = [], b
   );
 
   // OpsLog QSL "received" marker (ADIF extra). Drives the card's PSE/TNX stamp:
-  // received → TNX (thanks for your card), otherwise PSE QSL (please send one).
+  // received → TNX QSL (thanks for your card), otherwise PSE QSL (please send one).
   // Saved with the normal Save via draft.extras.
   const OPSLOG_QSL_RCVD = 'APP_OPSLOG_QSL_RCVD';
   const qslReceived = !!String(draft.extras?.[OPSLOG_QSL_RCVD] ?? '').trim();
@@ -717,7 +717,7 @@ export function QSOEditModal({ qso, onSave, onDelete, onClose, countries = [], b
                           </div>
                           <div className="flex items-center gap-2">
                             <span className="text-[11px] font-mono px-1.5 py-0.5 rounded bg-muted text-muted-foreground">
-                              {qslReceived ? 'TNX' : 'PSE QSL'}
+                              {qslReceived ? 'TNX QSL' : 'PSE QSL'}
                             </span>
                             <span className="text-[11px] text-muted-foreground">{t('qedit.pseTnxHint')}</span>
                           </div>