Function sliceColorForOverlay

src/gui/SpectrumWidget.cpp:4572–4576

Variant that respects the SliceLetterDisplay mode (#2606): when set to RadioIndexed, the colour follows the radio-provided per-client letter rather than the global slice id so the slice marker / passband colour keeps pace with the badge above the VFO.

// rather than the global slice id so the slice marker / passband colour
// keeps pace with the badge above the VFO.
static QColor sliceColorForOverlay(const SpectrumWidget::SliceOverlay& so) {
    const int colourIdx = SliceLabel::displayColorIndex(so.sliceId, so.perClientLetter);
    if (so.isActive) return SliceColorManager::instance().activeColor(colourIdx);
    return SliceColorManager::instance().dimColor(colourIdx);
}

// ─── Multi-slice overlay management ──────────────────────────────────────────