fix(webpub): the Distance column was empty for every QSO logged here

Nothing computes a distance when a QSO is logged. The DISTANCE field is only
ever filled by an ADIF import that carried one, so publishing it straight gave
an empty column to anyone whose log was made in OpsLog — which is everyone who
reported it.

It falls back to the two locators, which are on the QSO already. A stored
distance still wins: it came from the log that recorded the contact, which knew
more than two four-character squares do. No grids means an empty cell, not a
zero — an empty cell is honest, a zero is a claim.

Rounded to whole kilometres. The squares are tens of kilometres across and a
decimal would assert an accuracy nobody has.

The geometry moved to internal/geo on the way. It lived in package main, which
internal packages cannot import, so the PSK Reporter watcher already had its
maths injected from main and this would have been a third copy. A bearing that
disagrees with itself between two panels is a fault nobody reports, because each
screen looks perfectly plausible on its own.

changelog.json

@@ -3,10 +3,12 @@
     "version": "0.24.6",
     "date": "",
     "en": [
-      "Bulk edit can now set mode, submode and RST. They were excluded as per-QSO fields, which missed the point: bulk edit is for repairing a batch — an import that mapped every contact to SSB, an ADIF with no mode at all — and refusing meant editing a hundred rows one at a time. Setting the mode clears the submode, since one left over from the old mode contradicts the new one. Band stays with frequency, which already sets the two together."
+      "Bulk edit can now set mode, submode and RST. They were excluded as per-QSO fields, which missed the point: bulk edit is for repairing a batch — an import that mapped every contact to SSB, an ADIF with no mode at all — and refusing meant editing a hundred rows one at a time. Setting the mode clears the submode, since one left over from the old mode contradicts the new one. Band stays with frequency, which already sets the two together.",
+      "Web publishing: the Distance column is no longer empty. Nothing computes a distance when a QSO is logged — the stored field is only ever filled by an ADIF import that carried one — so it is worked out from the two locators instead, rounded to whole kilometres."
     ],
     "fr": [
-      "L édition groupée sait enfin régler le mode, le sous-mode et le RST. Ils étaient exclus comme champs propres à chaque QSO, ce qui manquait l essentiel : l édition groupée sert à RÉPARER un lot — un import qui a tout mis en SSB, un ADIF sans aucun mode — et refuser obligeait à corriger cent lignes une par une. Régler le mode efface le sous-mode, celui de l ancien mode contredisant le nouveau. La bande reste avec la fréquence, qui pose déjà les deux ensemble."
+      "L édition groupée sait enfin régler le mode, le sous-mode et le RST. Ils étaient exclus comme champs propres à chaque QSO, ce qui manquait l essentiel : l édition groupée sert à RÉPARER un lot — un import qui a tout mis en SSB, un ADIF sans aucun mode — et refuser obligeait à corriger cent lignes une par une. Régler le mode efface le sous-mode, celui de l ancien mode contredisant le nouveau. La bande reste avec la fréquence, qui pose déjà les deux ensemble.",
+      "Publication web : la colonne Distance n est plus vide. Rien ne calcule de distance à l enregistrement d un QSO — le champ stocké n est rempli que par un ADIF importé qui en portait une — elle est donc déduite des deux locators, arrondie au kilomètre."
     ]
   },
   {