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.

frontend/wailsjs/go/main/App.d.ts

@@ -24,6 +24,7 @@ import {udp} from '../models';
 import {lotwusers} from '../models';
 import {lookup} from '../models';
 import {netctl} from '../models';
+import {scp} from '../models';
 
 export function ACOMSetOperate(arg1:boolean):Promise<void>;
 
@@ -173,6 +174,8 @@ export function DownloadConfirmations(arg1:string,arg2:boolean,arg3:string):Prom
 
 export function DownloadLoTWUsers():Promise<number>;
 
+export function DownloadScp():Promise<number>;
+
 export function DownloadULSCounties():Promise<void>;
 
 export function DuplicateProfile(arg1:number,arg2:string):Promise<profile.Profile>;
@@ -459,6 +462,8 @@ export function GetRotatorSettings():Promise<main.RotatorSettings>;
 
 export function GetSPEStatus():Promise<spe.Status>;
 
+export function GetScpStatus():Promise<main.ScpStatus>;
+
 export function GetSecretStatus():Promise<main.SecretStatus>;
 
 export function GetSlotStats():Promise<qso.SlotStats>;
@@ -855,6 +860,8 @@ export function SaveUltrabeamSettings(arg1:main.UltrabeamSettings):Promise<void>
 
 export function SaveWinkeyerSettings(arg1:main.WinkeyerSettings):Promise<void>;
 
+export function ScpLookup(arg1:string):Promise<scp.Result>;
+
 export function SearchAwardReferences(arg1:string,arg2:string,arg3:number,arg4:number):Promise<Array<awardref.Ref>>;
 
 export function SendChatMessage(arg1:string):Promise<main.ChatMessage>;
@@ -889,6 +896,8 @@ export function SetDVKLabel(arg1:number,arg2:string):Promise<void>;
 
 export function SetPassphrase(arg1:string):Promise<void>;
 
+export function SetScpEnabled(arg1:boolean):Promise<void>;
+
 export function SetTelemetryEnabled(arg1:boolean):Promise<void>;
 
 export function SetUIPref(arg1:string,arg2:string):Promise<void>;