feat: Super Check Partial + N+1 helper; fix Flex binding to SmartSDR CAT; telemetry callsign wait

- SCP/N+1: new internal/scp downloads the community MASTER.SCP master list and a
  docked two-column widget shows, as you type a call, the known calls containing it
  (Partial) and the calls one edit away (N+1) — click to fix a busted call. Opt-in
  in Settings → General; top-bar toggle; queried debounced on callsign input.
- Flex: OpsLog's GUI-client detection was too loose and could bind to "SmartSDR CAT"
  (or DAX) — both carry "smartsdr" in the program name — instead of the real GUI
  client, making SmartSDR CAT drop and reconnect in a loop while OpsLog was open.
  Now it binds only to a real SmartSDR/Maestro GUI client (e.g. a FLEX-8600M's
  integrated screen) and excludes cat/dax; dropped the risky empty-program fallback.
- Telemetry: on a fresh install the callsign isn't set at launch, so the once-a-day
  heartbeat recorded the machine UUID. Now it waits (~10 min) for the operator to
  enter their callsign before sending, falling back to the UUID only if none appears.

changelog.json

@@ -3,9 +3,13 @@
     "version": "0.21.2",
     "date": "2026-07-25",
     "en": [
+      "Fixed OpsLog disrupting another Flex client: it could bind to 'SmartSDR CAT' (or DAX) instead of the real GUI client, which made SmartSDR CAT keep disconnecting/reconnecting from the radio while OpsLog was open. OpsLog now only binds to the actual SmartSDR/Maestro GUI client (e.g. a FlexRadio 'M' integrated screen).",
+      "New: Super Check Partial + N+1 callsign helper (like N1MM/DXLog). Enable it in Settings → General to download the community MASTER.SCP list; a docked two-column widget then shows, as you type a call, the known calls that contain it (Partial) and the calls one character away (N+1) — click one to fix a busted call.",
       "When a callsign isn't found on QRZ/HamQTH (or you don't use a lookup service), the name, QTH, locator and address are recovered from the last time you worked that station — and the precise locator from that QSO is used instead of the coarse cty.dat country centroid. A real QRZ/HamQTH hit still wins."
     ],
     "fr": [
+      "Correction : OpsLog pouvait perturber un autre client Flex — il pouvait se « binder » sur « SmartSDR CAT » (ou DAX) au lieu du vrai client GUI, ce qui faisait décrocher/reconnecter SmartSDR CAT de la radio en boucle tant qu'OpsLog était ouvert. OpsLog ne se binde désormais qu'au vrai client GUI SmartSDR/Maestro (ex. l'écran intégré d'un FlexRadio « M »).",
+      "Nouveau : assistant indicatifs Super Check Partial + N+1 (façon N1MM/DXLog). Active-le dans Réglages → Général pour télécharger la liste communautaire MASTER.SCP ; un widget ancré en 2 colonnes affiche alors, pendant que tu tapes, les indicatifs connus qui contiennent ta saisie (Partiel) et ceux à une lettre près (N+1) — clique pour corriger un call busté.",
       "Quand un indicatif est introuvable sur QRZ/HamQTH (ou si tu n'utilises pas de service de lookup), le nom, le QTH, le locator et l'adresse sont récupérés du dernier QSO avec cette station — et c'est le locator précis de ce QSO qui est utilisé, pas le centroïde du pays de cty.dat. Un vrai résultat QRZ/HamQTH reste prioritaire."
     ]
   },