feat(worked): fold portable callsigns into the worked-before history

Typing RK3DWA found nothing while RK3DWA/3 found 21 QSOs, so a station's
history was only visible if you happened to type the exact form it had been
logged under — and an operator who worked it as /0, /P or /MM saw none of it.
The other RDA tools and Log4OM fold these together; this does too.

The predicate strips the suffix from what was typed and matches "call = base OR
call LIKE base/%", so it works from either end: the base call finds the portable
QSOs and a portable call finds the plain ones. Deliberately not a bare prefix
LIKE 'RK3DWA%', which would also match RK3DWAB — a different station. The '/' is
what makes it the same operator.

Settings -> General to turn it off. Default ON, hence the inverted storage: an
existing install has no key, and reading that as OFF would leave everyone with
the behaviour we were asked to change.

Contest dupe checking is untouched — it runs through ContestDupe, a separate
binding, and stays an exact match as a contest requires.

changelog.json

@@ -1,4 +1,14 @@
 [
+  {
+    "version": "0.24.0",
+    "date": "",
+    "en": [
+      "Worked before: an operator's portable callsigns now count as the same station. Typing RK3DWA finds the RK3DWA/3, /P and /MM contacts too, and the other way round — before, the history only appeared if you typed the exact form. Can be turned off in Settings → General; contest dupe checking is unaffected and stays exact."
+    ],
+    "fr": [
+      "Déjà contacté : les indicatifs portables d'un opérateur comptent désormais comme la même station. Taper RK3DWA retrouve aussi les QSO en RK3DWA/3, /P et /MM, et inversement — avant, l'historique n'apparaissait que si tu tapais la forme exacte. Désactivable dans Réglages → Général ; le contrôle de doublon en concours n'est pas touché et reste strict."
+    ]
+  },
   {
     "version": "0.23.9",
     "date": "",