feat(decodes): sort a slot by SNR, frequency, distance, country or status

Click the heading. Within each PERIOD and never across them: the slots
are what this panel is — what was on the air in one fifteen-second
window — and a list sorted end to end would mix three minutes of decodes
into one column of numbers with no way to tell which window any of them
came from.

One click sorts the way that column is worth reading — strongest signal,
lowest frequency, furthest DX, A to Z, most wanted — the second reverses
it, and the third gives arrival order back. Arrival order stays the
default and stays one click away, because it mirrors the decoder's own
window line for line, which is what makes the two screens comparable at a
glance.

Status ranks by the cluster's own order, so the two views rank the same
things the same way, with the markers that are orthogonal to the entity —
a new county on a worked country — sorted above the plain duplicates.

A station that never sent a grid cannot be placed, and an unresolved
country is not a name: both sort to the end whichever way the column
goes, rather than pretending to a distance of zero and heading the list
under "nearest first".

frontend/src/lib/i18n.tsx

@@ -199,7 +199,7 @@ const en: Dict = {
   'wlc.title': 'Contest', 'wlc.pattern': 'Auto-add on', 'wlc.patternPh': 'WWA', 'wlc.patternHint': 'any spotted callsign CONTAINING this joins the watchlist as a contest entry (TM29WWA, HB9WWA, F4WWA/P)',
   'wlc.calls': 'And these callsigns, one per line', 'wlc.callsPh': 'R7W  DL0ABC', 'wlc.callsHint': 'For the entries a pattern cannot catch: a station taking part under a callsign that says nothing about the event. Named here, it joins the contest watchlist the moment it is spotted. Commas and spaces work too.',
   // FTx decodes panel (Tools -> FT decodes)
-  'ftmap.tab': 'FT Map', 'ftmap.noGrid': 'Set your station grid in Preferences to place the map.', 'dec.tab': 'FT decodes', 'dec.title': 'Decodes', 'dec.bandDrift': '{app} says {dec}, the rig is on {rig}', 'dec.bandDriftApp': 'the decoder', 'dec.bandDriftTip': 'The decoding application is announcing a band the radio is not on — it has most likely lost its CAT link and is repeating the last frequency it knew. Every decode below carries that band, so the NEW / NEW BAND verdicts are judged against it.', 'dec.cqOnly': 'CQ only',
+  'ftmap.tab': 'FT Map', 'ftmap.noGrid': 'Set your station grid in Preferences to place the map.', 'dec.tab': 'FT decodes', 'dec.title': 'Decodes', 'dec.bandDrift': '{app} says {dec}, the rig is on {rig}', 'dec.bandDriftApp': 'the decoder', 'dec.bandDriftTip': 'The decoding application is announcing a band the radio is not on — it has most likely lost its CAT link and is repeating the last frequency it knew. Every decode below carries that band, so the NEW / NEW BAND verdicts are judged against it.', 'dec.cqOnly': 'CQ only', 'dec.sortTip': 'Sort this slot by this column. Click again to reverse it, once more for the order the decoder heard them in.',
   'dec.allBands': 'All bands', 'dec.allModes': 'All modes', 'toast.qsoLogged': 'QSO logged', 'dec.contsHint': 'Continents: click to keep one or several', 'dec.allConts': 'All continents',
   'dec.minSnrTitle': 'Hide anything weaker than this SNR', 'dec.searchPh': 'Call, grid or message',
   'dec.clearFilters': 'Clear', 'dec.live': 'live', 'dec.tx': 'TX',
@@ -811,7 +811,7 @@ const fr: Dict = {
   'wlc.title': 'Contest', 'wlc.pattern': 'Ajout auto sur', 'wlc.patternPh': 'WWA', 'wlc.patternHint': 'tout indicatif spotté CONTENANT ceci rejoint la watchlist comme entrée contest (TM29WWA, HB9WWA, F4WWA/P)',
   'wlc.calls': 'Et ces indicatifs, un par ligne', 'wlc.callsPh': 'R7W  DL0ABC', 'wlc.callsHint': 'Pour les participants qu’aucun motif ne peut attraper : une station engagée sous un indicatif qui ne dit rien de l’événement. Nommée ici, elle rejoint la watchlist contest dès qu’elle est spottée. Les virgules et les espaces marchent aussi.',
   // Panneau des decodes FTx (Outils -> Decodes FT)
-  'ftmap.tab': 'FT Map', 'ftmap.noGrid': 'Renseigne ton locator dans les Préférences pour placer la carte.', 'dec.tab': 'Decodes FT', 'dec.title': 'Decodes', 'dec.bandDrift': '{app} annonce {dec}, le poste est sur {rig}', 'dec.bandDriftApp': 'le décodeur', 'dec.bandDriftTip': 'Le logiciel de décodage annonce une bande sur laquelle la radio n’est pas — il a très probablement perdu sa liaison CAT et répète la dernière fréquence connue. Tous les décodages ci-dessous portent cette bande, et les verdicts NOUVEAU / NOUVELLE BANDE sont jugés dessus.', 'dec.cqOnly': 'CQ seulement',
+  'ftmap.tab': 'FT Map', 'ftmap.noGrid': 'Renseigne ton locator dans les Préférences pour placer la carte.', 'dec.tab': 'Decodes FT', 'dec.title': 'Decodes', 'dec.bandDrift': '{app} annonce {dec}, le poste est sur {rig}', 'dec.bandDriftApp': 'le décodeur', 'dec.bandDriftTip': 'Le logiciel de décodage annonce une bande sur laquelle la radio n’est pas — il a très probablement perdu sa liaison CAT et répète la dernière fréquence connue. Tous les décodages ci-dessous portent cette bande, et les verdicts NOUVEAU / NOUVELLE BANDE sont jugés dessus.', 'dec.cqOnly': 'CQ seulement', 'dec.sortTip': 'Trier ce créneau sur cette colonne. Un second clic inverse, un troisième rend l’ordre dans lequel le décodeur les a entendus.',
   'dec.allBands': 'Toutes bandes', 'dec.allModes': 'Tous modes', 'toast.qsoLogged': 'QSO enregistré', 'dec.contsHint': 'Continents : clique pour en garder un ou plusieurs', 'dec.allConts': 'Tous continents',
   'dec.minSnrTitle': 'Masquer tout ce qui est plus faible que ce rapport', 'dec.searchPh': 'Indicatif, locator ou message',
   'dec.clearFilters': 'Effacer', 'dec.live': 'en direct', 'dec.tx': 'TX',