fix(qsl): separate the QSL manager from the routing method (#16)

QSL_VIA is the manager. QSL_SENT_VIA and QSL_RCVD_VIA are the ADIF "QSL Via"
enumeration — B bureau, D direct, E electronic, M manager (import-only) —
and say how a card travelled. OpsLog had one column for all three:

  - the import folded QSL_SENT_VIA into QSL_VIA whenever QSL_VIA was empty,
    which is exactly a Log4OM export (it defaults QSL_SENT_VIA to E), so
    OE6CLD saw "E" everywhere OpsLog shows the manager;
  - QSL_RCVD_VIA was listed in adifPromoted with no column behind it, so it
    was not stored, not kept among the extras, and not exported — dropped
    outright on import;
  - neither was ever written on export, so an import followed by an export
    destroyed both;
  - and OpsLog polluted the field itself: the QSL Manager panel wrote
    "Bureau" / "Direct" / "Electronic", in full words, into QSL_VIA.

Two columns added (migration 0027), carried through the five places a
promoted ADIF field has to touch, with round-trip tests pinning the reported
case. The QSL panel now offers Bureau / Direct / Electronic for each
direction and stores the enumeration; the manager field is labelled as the
manager and holds only that. M is kept when a file gives it and never
written back out.

Existing logs hold a mixture of the two in one column. The repair is offered,
not performed: the count is shown once per log with a plain question, and a
"no" is remembered. It moves only where QSL_SENT_VIA is still empty, and only
values that normalise to the enumeration — a manager is a callsign and can
never be one of those six words, which a test pins against real manager calls.

changelog.json

@@ -10,7 +10,10 @@
       "Appearance: new Sahara theme, warm sand tones for long sessions in daylight.",
       "US counties: Connecticut resolved to the census planning regions, so every CT station showed as a new county. Re-download the database.",
       "US counties: San Francisco, Doña Ana, Baltimore city, St. Louis city and several Alaska boroughs matched no county at all.",
-      "DX cluster: the US county column now shows the county the station is logged with, so it agrees with the Info panel."
+      "DX cluster: the US county column now shows the county the station is logged with, so it agrees with the Info panel.",
+      "QSL: the manager (QSL_VIA) and the routing method (QSL_SENT_VIA / QSL_RCVD_VIA) are now separate fields, as ADIF defines them.",
+      "ADIF import: QSL_SENT_VIA no longer lands in the manager field, and QSL_RCVD_VIA is no longer discarded. Both are exported.",
+      "QSL: logs where a routing word sits in the manager field are counted at startup and corrected only if you accept."
     ],
     "fr": [
       "Amplificateurs : coche ceux qui partagent un combiner et ON, OFF et OPERATE agissent sur tous à la fois. Chacun garde ses mesures.",
@@ -20,7 +23,10 @@
       "Apparence : nouveau thème Sahara, tons sable chauds pour les longues sessions en plein jour.",
       "Comtés US : le Connecticut renvoyait les planning regions du recensement, toute station CT semblait un nouveau comté. Rechargez la base.",
       "Comtés US : San Francisco, Doña Ana, Baltimore city, St. Louis city et plusieurs districts d’Alaska ne correspondaient à aucun comté.",
-      "Cluster DX : la colonne comté US affiche le comté du log quand la station y figure, donc identique au panneau Info."
+      "Cluster DX : la colonne comté US affiche le comté du log quand la station y figure, donc identique au panneau Info.",
+      "QSL : le manager (QSL_VIA) et le mode d’envoi (QSL_SENT_VIA / QSL_RCVD_VIA) sont désormais deux champs distincts, comme le veut l’ADIF.",
+      "Import ADIF : QSL_SENT_VIA ne se retrouve plus dans le champ manager, et QSL_RCVD_VIA n’est plus perdu. Les deux sont exportés.",
+      "QSL : les logs où un mode d’envoi occupe le champ manager sont comptés au démarrage et corrigés seulement si vous acceptez."
     ]
   },
   {