feat(appearance): colour log rows by QSL status, and fix UDP QSO numbering

New Settings → Appearance section: whole-row colouring in the log grid driven
by QSL / LoTW state, each rule with its own colour from a palette or a free
picker. What Logger32 does, with one difference that matters — the colour is
applied as a 24% tint, not a fill. Logger32's grid is white; this one is dark,
and a saturated user-picked colour behind white text is unreadable at exactly
the moment the operator is scanning for what still needs sending.

Rules are ORDERED and the first match wins, because a contact is usually
several of these at once: one confirmed on LoTW and by card is confirmed, not
"sent, awaiting reply". The order lives in the data so the panel can show the
rules in the order they actually apply, numbered.

The colour is interpolated into a CSS color-mix(), so anything that is not
plainly #rrggbb is refused on the way in and falls back to the default.

Also fixes the QSO number column, which was empty for contacts logged from
WSJT-X: that path inserts through the repo directly and never reached AddQSO.
Rather than chase each of the remaining bulk-insert paths — the POTA hunter
import and the LoTW/QRZ "add what I was missing" passes, which insert OLD
dates and so shift every number after them — the index now checks its length
against a COUNT and rebuilds when they disagree. One indexed count beats
remembering to invalidate in a place that does not exist yet.

changelog.json

@@ -8,7 +8,9 @@
       "Band openings: the PSK Reporter feed is now filtered at the broker, which cuts it from about 83 messages a second to under two.",
       "Band openings: unticking a band now actually stops its announcements, and puts its badge out.",
       "Callsign lookup: the website, postal code and HamQTH profile picture are now read — the QSO web column was never filled by any lookup.",
-      "New selectable column \"QSO number\": position in the log, 1 for the oldest contact."
+      "New selectable column \"QSO number\": position in the log, 1 for the oldest contact.",
+      "New Appearance settings: colour whole log rows by QSL status, with your own colours from a palette.",
+      "The QSO number was missing on contacts logged from WSJT-X — that path bypassed the numbering."
     ],
     "fr": [
       "Cluster : le cache de locators garde 100 000 indicatifs et tourne au lieu de se vider, les locators ne disparaissent donc plus de la liste.",
@@ -16,7 +18,9 @@
       "Ouvertures de bande : le flux PSK Reporter est désormais filtré chez le broker, ce qui le fait passer d environ 83 messages par seconde à moins de deux.",
       "Ouvertures de bande : décocher une bande arrête réellement ses annonces et éteint son badge.",
       "Recherche d indicatif : le site web, le code postal et la photo de profil HamQTH sont désormais lus — la colonne web du QSO n était jamais remplie.",
-      "Nouvelle colonne sélectionnable « Numéro de QSO » : position dans le log, 1 pour le contact le plus ancien."
+      "Nouvelle colonne sélectionnable « Numéro de QSO » : position dans le log, 1 pour le contact le plus ancien.",
+      "Nouveaux réglages Apparence : colorer les lignes entières du log selon le statut QSL, avec tes couleurs choisies dans une palette.",
+      "Le numéro de QSO manquait sur les contacts enregistrés depuis WSJT-X — ce chemin contournait la numérotation."
     ]
   },
   {