Update live waveform using rtaudio

DynamicIsland/audio/AudioBridge.h

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+/*
+ * Atoll (DynamicIsland)
+ * Copyright (C) 2024-2026 Atoll Contributors
+ *
+ * Objective-C bridge to expose C++ AudioProcessor to Swift.
+ *
+ * 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 <Foundation/Foundation.h>
+#import <simd/simd.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface AudioBridge : NSObject
+
+- (void)processBuffer:(const float *)buffer count:(int)count;
+
+// Reads atomically from the processor — safe to call from any thread
+- (simd_float4)getSmoothedMagnitudes;
+
+@end
+
+NS_ASSUME_NONNULL_END