Method buildPhonePanel

src/gui/PhoneCwApplet.cpp:137–384

// ── Phone sub-panel (existing P/CW controls) ────────────────────────────────

void PhoneCwApplet::buildPhonePanel()
{
    m_phonePanel = new QWidget;
    auto* vbox = new QVBoxLayout(m_phonePanel);
    vbox->setContentsMargins(4, 2, 4, 2);
    vbox->setSpacing(2);

    // ── Level gauge (mic peak, dBFS: -40 to +10) ────────────────────────
    m_levelGauge = new HGauge(-40.0f, 10.0f, 0.0f, "Level", "dB",
        {{-40, "-40dB"}, {-30, "-30"}, {-20, "-20"}, {-10, "-10"}, {0, "0"}, {5, "+5"}, {10, "+10"}},
        nullptr, -10.0f);
    m_levelGauge->setAccessibleName("Microphone level gauge");
    m_levelGauge->setAccessibleDescription("Microphone input level in dBFS");
    // Mouse-over readout: exact mic peak in dB. (#3936)
    m_levelGauge->setHoverValueFormatter([](float v) {
        return QStringLiteral("%1 dB").arg(QString::number(v, 'f', 1));
    });
    m_levelGauge->setHoverValuePopupEnabled(true);
    vbox->addWidget(m_levelGauge);

    // ── Compression gauge (dB: -25 to 0, fills right-to-left) ───────────
    m_compGauge = new HGauge(-25.0f, 0.0f, 1.0f, "Compression", "",
        {{-25, "-25dB"}, {-20, "-20"}, {-15, "-15"}, {-10, "-10"}, {-5, "-5"}, {0, "0"}});
    m_compGauge->setReversed(true);
    m_compGauge->setAccessibleName("Compression gauge");
    m_compGauge->setAccessibleDescription("Speech compression amount in dB");
    // Mouse-over readout: the gauge stores compression as a negative offset
    // (-25…0); report it as a positive "amount of compression" in dB. (#3936)
    m_compGauge->setHoverValueFormatter([](float v) {
        return QStringLiteral("%1 dB").arg(QString::number(-v, 'f', 1));
    });
    m_compGauge->setHoverValuePopupEnabled(true);
    vbox->addWidget(m_compGauge);

    // ── ALC gauge (post-SW-ALC SSB-peak, dBFS) ──────────────────────────
    // Mirrored in m_cwPanel; both gauges read from MeterModel::swAlcChanged
    // so SSB operators watching mic gain see the same indicator CW
    // operators use to verify clean keying envelope shape.
    m_alcGaugePhone = new HGauge(kAlcGaugeFloorDbfs, 0.0f, -3.0f, "ALC", "dBFS",
        {{-20, "-20"}, {-15, "-15"}, {-10, "-10"}, {-5, "-5"}, {0, "0"}});
    m_alcGaugePhone->setFillFromRight(true);  // empty at -20, fills leftward toward 0
    m_alcGaugePhone->setValueImmediate(kAlcGaugeFloorDbfs);
    m_alcGaugePhone->setAccessibleName("ALC gauge (Phone)");
    m_alcGaugePhone->setAccessibleDescription("Automatic level control — post-software-ALC SSB peak (dBFS)");
    m_alcGaugePhone->setHoverValueFormatter(alcHoverFormatter());
    m_alcGaugePhone->setHoverValuePopupEnabled(true);
    vbox->addWidget(m_alcGaugePhone);
    vbox->addSpacing(4);

    // ── Mic profile dropdown ─────────────────────────────────────────────
    m_micProfileCombo = new GuardedComboBox;
    m_micProfileCombo->setFixedHeight(22);
    m_micProfileCombo->setAccessibleName("Microphone profile");
    m_micProfileCombo->setAccessibleDescription("Select microphone processing profile");
    AetherSDR::applyComboStyle(m_micProfileCombo);
    connect(m_micProfileCombo, QOverload<int>::of(&QComboBox::currentIndexChanged),
            this, [this](int) {
        if (!m_updatingFromModel && m_model) {