feat(calls): implement advanced multi-model ML noise suppression system

Implement a flexible, multi-model noise suppression pipeline for Element Call/LiveKit integration:

- ML Engines: Added support for RNNoise, Speex, DTLN, and DeepFilterNet 3 models.
- Pipeline Architecture: Implemented modular audio processing in lotus-denoise.js, supporting 'Series Suppression' (running browser-native NSNet2 before ML) and a hardware-style Noise Gate.
- UI & UX Enhancements:
  - Settings UI: Added model comparison chart with CPU/Quality metadata.
  - Tuning: Added Live Microphone Meter for calibrating Noise Gate thresholds.
  - Reporting: Added LotusToast system to alert users when ML suppression fails or falls back to raw input.
- Robustness & Quality:
  - Capture Fidelity: Removed forced 48kHz capture constraints to allow native-rate capture (solving static issues with high-end audio interfaces).
  - Performance: Added WASM SIMD detection with transparent fallback.
  - Capability Detection: Added browser feature detection to disable unsupported ML modes.
- Build Integration: Updated Vite config to self-host all model WASM/tflite assets in /denoise/ directory.

src/app/pages/client/ClientNonUIFeatures.tsx

@@ -382,6 +382,32 @@ function DeepLinkNavigator() {
   return null;
 }
 
+function LotusDenoiseFeature() {
+  const setToast = useSetAtom(toastQueueAtom);
+
+  useEffect(() => {
+    const handleMessage = (event: MessageEvent) => {
+      if (event.data?.type === 'lotus-denoise-status') {
+        const { active, error } = event.data;
+        if (!active) {
+          setToast({
+            id: `denoise-fail-${Date.now()}`,
+            displayName: 'Audio Quality',
+            body: `ML Noise Suppression failed: ${error || 'Unknown error'}. Falling back to raw mic.`,
+            roomName: 'System',
+            roomId: '',
+          });
+        }
+      }
+    };
+
+    window.addEventListener('message', handleMessage);
+    return () => window.removeEventListener('message', handleMessage);
+  }, [setToast]);
+
+  return null;
+}
+
 export function ClientNonUIFeatures({ children }: ClientNonUIFeaturesProps) {
   return (
     <>
@@ -391,6 +417,7 @@ export function ClientNonUIFeatures({ children }: ClientNonUIFeaturesProps) {
       <PresenceUpdater />
       <InviteNotifications />
       <MessageNotifications />
+      <LotusDenoiseFeature />
       <DeepLinkNavigator />
       {children}
     </>