feat(tui): add interactive 5-band per-user equalizer

cmd/tui/model.go

@@ -120,6 +120,9 @@ type Model struct {
 	showUserView bool
 	viewUser     *UserNode
 	pokeID       uint16 // Target ID for pending poke
+
+	// Interactive EQ
+	eqBandIdx int // 0-4
 }
 
 // addLog adds a message to the log panel
@@ -820,6 +823,28 @@ func (m *Model) handleUserViewKeys(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 			newVol = 0.0
 		}
 		m.audioPlayer.SetUserVolume(u.ID, newVol)
+
+	case "right", "l":
+		// Increase Gain for selected band
+		current := m.audioPlayer.GetUserGain(u.ID, m.eqBandIdx)
+		m.audioPlayer.SetUserGain(u.ID, m.eqBandIdx, current+1.0)
+
+	case "left", "h":
+		// Decrease Gain
+		current := m.audioPlayer.GetUserGain(u.ID, m.eqBandIdx)
+		m.audioPlayer.SetUserGain(u.ID, m.eqBandIdx, current-1.0)
+
+	case "up", "k":
+		m.eqBandIdx--
+		if m.eqBandIdx < 0 {
+			m.eqBandIdx = 4
+		}
+
+	case "down", "j":
+		m.eqBandIdx++
+		if m.eqBandIdx > 4 {
+			m.eqBandIdx = 0
+		}
 	}
 	return m, nil
 }
@@ -1412,14 +1437,85 @@ func (m *Model) renderUserView() string {
 		"--- Audio Settings ---",
 		fmt.Sprintf("%s %d%%", labelStyle.Render("Volume:"), int(vol*100)),
 		fmt.Sprintf("%s %s", labelStyle.Render("Local Mute:"), muteStr),
+	}
+
+	// EQ Visualization
+	var eqGraph []string
+	if m.audioPlayer != nil {
+		bands := m.audioPlayer.GetEQBands(u.ID)
+		if len(bands) > 0 {
+			eqGraph = append(eqGraph, "", "--- Interactive Equalizer ---", "")
+
+			// Render bars for 5 bands
+			// 0: Bass, 1: Low-Mid, 2: Mid, 3: High-Mid, 4: High
+			labels := []string{"100Hz", "350Hz", "1kHz", "3kHz", "8kHz"}
+
+			for i, val := range bands {
+				if i >= len(labels) {
+					break
+				}
+
+				// Get current gain setting
+				gain := m.audioPlayer.GetUserGain(u.ID, i)
+
+				// Scale 0.0-1.0 to bars (width 20)
+				const maxBars = 20
+				bars := int(val * maxBars)
+				if bars > maxBars {
+					bars = maxBars
+				}
+
+				// Bar characters: █ ▇ ▆ ▅ ▄ ▃ ▂
+				barStr := ""
+				if bars > 0 {
+					barStr = strings.Repeat("█", bars)
+				}
+
+				// Colorize based on intensity
+				barStyle := lipgloss.NewStyle().Foreground(lipgloss.Color("39")) // Blue default
+				if val > 0.8 {
+					barStyle = barStyle.Foreground(lipgloss.Color("196")) // Red clipping
+				} else if val > 0.5 {
+					barStyle = barStyle.Foreground(lipgloss.Color("208")) // Orange high
+				} else if val > 0.2 {
+					barStyle = barStyle.Foreground(lipgloss.Color("46")) // Green normal
+				}
+
+				// Selection Indicator
+				selector := "  "
+				labelStyle := lipgloss.NewStyle().Foreground(lipgloss.Color("240")).Width(6)
+				gainStyle := lipgloss.NewStyle().Foreground(lipgloss.Color("245")).Width(6)
+
+				if i == m.eqBandIdx {
+					selector = "->"
+					labelStyle = labelStyle.Foreground(lipgloss.Color("226")).Bold(true) // Yellow for selected
+					gainStyle = gainStyle.Foreground(lipgloss.Color("226"))
+				}
+
+				gainStr := fmt.Sprintf("%+3.0fdB", gain)
+
+				line := fmt.Sprintf("%s %s %s | %s",
+					selector,
+					labelStyle.Render(labels[i]),
+					gainStyle.Render(gainStr),
+					barStyle.Render(fmt.Sprintf("%-20s", barStr)))
+
+				eqGraph = append(eqGraph, line)
+			}
+		}
+	}
+
+	info = append(info, eqGraph...)
+	info = append(info,
 		"",
 		"--- Menu ---",
 		"1. Poke",
 		"2. Toggle Local Mute",
 		"+/-: Adjust Volume",
+		"Arrows: Adjust EQ",
 		"",
 		"(Press ESC to close)",
-	}
+	)
 
 	return lipgloss.JoinVertical(lipgloss.Left, info...)
 }