fix(slices): center badge letter via widgetset TextRect

Manual TextWidth/TextHeight centering pushed the glyph up-left on the
substituted monospace font (Linux). Let the widgetset center it with a
taCenter/tlCenter TTextStyle, fixing the A/×/SPLIT/TX badges.

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

VfoOverlay.pas

@@ -592,6 +592,8 @@ end;
 
 procedure TVfoOverlay.DrawBadge(C: TCanvas; const R: TRect; const Lbl: string;
   BgColor, TxtColor: TColor);
+var
+  TS: TTextStyle;
 begin
   C.Brush.Color := BgColor;
   C.Brush.Style := bsSolid;
@@ -603,8 +605,14 @@ begin
   C.Font.Style := [fsBold];
   C.Font.Color := TxtColor;
   C.Brush.Style := bsClear;
-  C.TextOut(R.Left + (R.Right - R.Left - C.TextWidth(Lbl)) div 2,
-            R.Top  + (R.Bottom - R.Top - C.TextHeight('A')) div 2, Lbl);
+  // Центровку доверяем виджетсету (TextRect со стилем) — ручной расчёт по
+  // TextWidth/Height на подменном шрифте уводил глиф влево-вверх.
+  FillChar(TS, SizeOf(TS), 0);
+  TS.Alignment := taCenter;
+  TS.Layout    := tlCenter;
+  TS.SingleLine := True;
+  TS.Clipping   := True;
+  C.TextRect(R, R.Left, R.Top, Lbl, TS);
 end;
 
 procedure TVfoOverlay.DrawSpeaker(C: TCanvas; X, Y: Integer; Muted: Boolean);