feat: QO-100 beacon lock — robustness, persistence, FT8-aware UI

Builds on the beacon-lock baseline: keeps the proven display-FFT control
path (hardware-LO trim folded into the active transverter LOError), and
hardens it. The narrowband NCO/FLL scaffold (BeaconLock.pas) is removed —
it was never in the control path.

- RadioController:
  * Persist live: each correction folds straight into the active xvtr
    LOError (visible in Settings, survives restart as LNB calibration);
    disk writes throttled. FBeaconLockHz is now only a session indicator.
  * Robust tracking vs nearby signals: narrow ±2 kHz gate while locked
    (±6 kHz only for acquisition), slew-rate outlier rejection (a sudden
    centroid jump = interferer, not slow LNB drift → ignored), and lobe
    shape validation in MeasureBeaconFFT (width + power symmetry) so a CW
    carrier / one-sided neighbour isn't mistaken for the BPSK beacon.
    Prominence measured over the in-window noise floor (gate-width robust).
  * Fast convergence: feed-forward (predict post-retune position so the
    window follows the beacon through the jump) + near-deadbeat correction
    on the manual click → one click locks instead of repeated tapping.
  * Single central BPSK beacon (10489.750); dead CoarseBeaconOffset and
    unused throttle counters removed; stale NCO/FLL/4 Hz comments fixed.
- WDSPEngine: drop the per-sample TBeaconTracker RX-IQ tap (tracker gone).
- MainForm: BEACON is now a plain button, shown only on Pluto in a
  transverter. Lock status (off / click / search / LOCK + correction +
  prominence) moves to status-bar field 7 in place of PLL on Pluto;
  openHPSDR keeps PLL there.
- SettingsForm/StatusBar: widen LO Error field to ±10 MHz (QO-100 LNBs
  drift hundreds of kHz) and widen status field 7 for the beacon text.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

WDSPEngine.pas

@@ -25,7 +25,7 @@ interface
 
 uses
   Classes, SysUtils, Math, SyncObjs,
-  WDSP, BeaconLock;
+  WDSP;
 
 const
   // WDSP mode integers (нет именованных констант в WDSP.pas)
@@ -292,7 +292,6 @@ type
     FMuted:      Boolean;
     FVolume:     Double;
     FLastError:  string;
-    FBeaconTracker: TBeaconTracker;   // QO-100 beacon lock (НЕ владеем; см. контроллер)
 
     function  ModeToWDSP(Mode: Integer): Integer;
     procedure ApplyDefaultFilter;
@@ -355,9 +354,6 @@ type
     procedure UpdateAGCLines(SpectrumW: Integer);  // читает hang/thresh из WDSP для линии на спектре
     procedure SetSpectrumWidth(W: Integer);         // обновляет FLastSpectrumW для корректных AGC линий
     procedure SetShift(ShiftHz: Double);  // CTUN NCO сдвиг
-    // QO-100 beacon lock: трекер кормится RX-IQ из DSP-потока. Владелец —
-    // контроллер; движок лишь подаёт сэмплы и сообщает sample rate.
-    procedure SetBeaconTracker(T: TBeaconTracker);
     procedure SetNRMode(Mode: Integer);
     procedure SetNR(Enable: Boolean);
     procedure SetNBMode(Mode: Integer);
@@ -1123,7 +1119,6 @@ begin
   // Обновляем параметры
   FSampleRate   := NewRate;
   FBufSize      := FAudioBufSize * NewRate div FAudioRate;
-  if FBeaconTracker <> nil then FBeaconTracker.Configure(FSampleRate);
 
   // Перераспределяем буферы под новый размер
   SetLength(FRXIn,    FBufSize * 2);
@@ -1218,11 +1213,6 @@ begin
 
     FeedDisplaySample(IR * SCALE, QR * SCALE);
 
-    // QO-100 beacon lock: тот же baseband-IQ @ FSampleRate (трекер сам
-    // мгновенно выходит, если лок не активен — стоимость ~1 проверка/сэмпл).
-    if FBeaconTracker <> nil then
-      FBeaconTracker.Feed(IR * SCALE, QR * SCALE);
-
     FRXAccI[FRXAccPos] := IR * SCALE;
     FRXAccQ[FRXAccPos] := QR * SCALE;
     Inc(FRXAccPos);
@@ -1381,12 +1371,6 @@ begin
   UpdateAGCLines(FLastSpectrumW);
 end;
 
-procedure TWDSPEngine.SetBeaconTracker(T: TBeaconTracker);
-begin
-  FBeaconTracker := T;
-  if (T <> nil) and (FSampleRate > 0) then T.Configure(FSampleRate);
-end;
-
 procedure TWDSPEngine.SetShift(ShiftHz: Double);
 begin
   FShiftHz := ShiftHz;