feat(audio): add latency metrics collection for input and output

Add granular metrics collection for audio processing latency in both input and output paths. This enables better performance monitoring through histograms.

Also update build tags to include ARM platform and rename UI label for clarity.

internal/audio/input.go

@@ -110,6 +110,12 @@ func (aim *AudioInputManager) WriteOpusFrame(frame []byte) error {
 	atomic.AddInt64(&aim.framesSent, 1)
 	aim.recordFrameProcessed(len(frame))
 	aim.updateLatency(processingTime)
+
+	// Record latency to granular metrics collector for histogram
+	if granularCollector := GetGranularMetricsCollector(); granularCollector != nil {
+		granularCollector.RecordInputLatency(processingTime)
+	}
+
 	return nil
 }
 
@@ -145,6 +151,12 @@ func (aim *AudioInputManager) WriteOpusFrameZeroCopy(frame *ZeroCopyAudioFrame)
 	atomic.AddInt64(&aim.framesSent, 1)
 	aim.recordFrameProcessed(frame.Length())
 	aim.updateLatency(processingTime)
+
+	// Record latency to granular metrics collector for histogram
+	if granularCollector := GetGranularMetricsCollector(); granularCollector != nil {
+		granularCollector.RecordInputLatency(processingTime)
+	}
+
 	return nil
 }
 

internal/audio/output_ipc_manager.go

@@ -103,6 +103,11 @@ func (aom *AudioOutputIPCManager) WriteOpusFrame(frame *ZeroCopyAudioFrame) erro
 	aom.recordFrameProcessed(frame.Length())
 	aom.updateLatency(processingTime)
 
+	// Record latency to granular metrics collector for histogram
+	if granularCollector := GetGranularMetricsCollector(); granularCollector != nil {
+		granularCollector.RecordOutputLatency(processingTime)
+	}
+
 	return nil
 }
 
@@ -132,6 +137,11 @@ func (aom *AudioOutputIPCManager) WriteOpusFrameZeroCopy(frame *ZeroCopyAudioFra
 	aom.recordFrameProcessed(len(frameData))
 	aom.updateLatency(processingTime)
 
+	// Record latency to granular metrics collector for histogram
+	if granularCollector := GetGranularMetricsCollector(); granularCollector != nil {
+		granularCollector.RecordOutputLatency(processingTime)
+	}
+
 	return nil
 }
 

internal/audio/validation.go

@@ -1,5 +1,5 @@
-//go:build cgo
-// +build cgo
+//go:build cgo || arm
+// +build cgo arm
 
 package audio
 

ui/src/components/AudioMetricsDashboard.tsx

@@ -478,7 +478,7 @@ export default function AudioMetricsDashboard() {
             <div className="mb-2 flex items-center gap-2">
               <MdMic className="h-4 w-4 text-green-600 dark:text-green-400" />
               <span className="font-medium text-slate-900 dark:text-slate-100">
-                Microphone Input Config
+                Audio Input Config
               </span>
             </div>
             <div className="space-y-2 text-sm">