Update live waveform using rtaudio

DynamicIsland/audio/AudioVisualizerView.swift

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+/*
+ * Atoll (DynamicIsland)
+ * Copyright (C) 2024-2026 Atoll Contributors
+ *
+ * Unified audio visualizer that conditionally uses real-time audio spectrum
+ * or the original animated spectrum based on user preference.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ */
+
+import SwiftUI
+import Defaults
+
+/// Unified audio visualizer view that switches between real-time and animated based on user preference
+struct AudioVisualizerView: View {
+    @Binding var isPlaying: Bool
+    @Default(.enableRealTimeWaveform) private var enableRealTimeWaveform
+    
+    var body: some View {
+        if enableRealTimeWaveform {
+            RealTimeAudioSpectrumView(isPlaying: $isPlaying)
+        } else {
+            AudioSpectrumView(isPlaying: $isPlaying)
+        }
+    }
+}
+
+#Preview("Animated") {
+    AudioVisualizerView(isPlaying: .constant(true))
+        .frame(width: 16, height: 20)
+        .padding()
+}