fix(client): deduplicate mic.capture_report trace emissions (#2189)

Reduces trace noise from `mic.capture_report` by only tracing when the
`capturesAudio` value actually changes, rather than on every periodic
emission during sustained silence. The internal `dispatchEvent`
continues firing on every callback so downstream consumers are
unaffected.

### 📝 Implementation notes

- Added a `lastCapturesAudio` variable scoped to each no-audio detector instance inside `MicrophoneManager.setup()`
- `tracer.trace('mic.capture_report', ...)` is now gated on `capturesAudio !== lastCapturesAudio`
- `streamClient.dispatchEvent(event)` remains unconditional
- The variable naturally resets when the detector is torn down on device switch or mic disable/re-enable, so the first emission from a new detector always traces

Author: oliverlaz

packages/client/src/devices/MicrophoneManager.ts

@@ -158,6 +158,7 @@ export class MicrophoneManager extends AudioDeviceManager<MicrophoneManagerState
           const devices = await firstValueFrom(this.listDevices());
           const label = devices.find((d) => d.deviceId === deviceId)?.label;
 
+          let lastCapturesAudio: boolean | undefined;
           this.noAudioDetectorCleanup = createNoAudioDetector(mediaStream, {
             noAudioThresholdMs: this.silenceThresholdMs,
             emitIntervalMs: this.silenceThresholdMs,
@@ -169,7 +170,12 @@ export class MicrophoneManager extends AudioDeviceManager<MicrophoneManagerState
                 deviceId,
                 label,
               };
-              this.call.tracer.trace('mic.capture_report', event);
+
+              if (capturesAudio !== lastCapturesAudio) {
+                lastCapturesAudio = capturesAudio;
+                this.call.tracer.trace('mic.capture_report', event);
+              }
+
               this.call.streamClient.dispatchEvent(event);
             },
           });