feat: RNNoise WASM AudioWorklet for ML-based noise suppression (Phase 3)

Inject @sapphi-red/web-noise-suppressor into AudioManager's input pipeline
as a toggleable AudioWorkletNode. The worklet is loaded lazily on first
enable, then kept alive — toggling bypasses by rewiring the graph without
destroying the WASM instance. Browser NS is forced off when RNNoise is
active to avoid double-processing. InputGain forced to stereo up-mix to
prevent mono-left-only output from the worklet. Also wires Phase 2 output
device routing (setSinkId) into AppLayout/ChannelSidebar.

packages/web/package.json

@@ -11,6 +11,7 @@
   "dependencies": {
     "@livekit/components-react": "^2.7.4",
     "@opencord/shared": "workspace:*",
+    "@sapphi-red/web-noise-suppressor": "^0.3.5",
     "livekit-client": "^2.9.0",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",