revert: simplify listen to PCM-only, remove WebCodecs complexity

- Remove broadcastOpusToWeb from types and webserver
- Revert recorder to PCM-only broadcast path
- Remove WebCodecs AudioDecoder from dashboard.js
- Simplify WebSocket handler to just play PCM frames
- Remove Howler.js and Tone.js dependencies
- Keep simple AudioContext playback that works reliably

package.json

@@ -24,6 +24,7 @@
     "express": "^5.2.1",
     "fluent-ffmpeg": "^2.1.3",
     "helmet": "^8.1.0",
+    "howler": "^2.2.4",
     "libsodium-wrappers": "^0.8.2",
     "p-retry": "^6.2.0",
     "pino": "^9.4.0",
@@ -33,7 +34,6 @@
     "react": "^19.2.6",
     "react-dom": "^19.2.6",
     "sodium-native": "^4.3.2",
-    "tone": "^15.1.22",
     "ws": "^8.20.1",
     "zod": "^4.4.3"
   },

public/dashboard.js

@@ -11,9 +11,6 @@ const state = {
       processor: null,
       nextStartTime: 0,
       noiseGateHold: 0,
-      opusDecoder: null,
-      opusDecoderReady: false,
-      opusDecodeQueue: [],
     };
 
     const SAMPLE_RATE = 24000;
@@ -165,19 +162,7 @@ const state = {
           handleJsonEvent(event.data);
           return;
         }
-        if (!state.isListening) return;
-        const bytes = new Uint8Array(event.data);
-        if (bytes.byteLength < 5) {
-          playPcm(event.data);
-          return;
-        }
-        const mode = bytes[0];
-        if (mode === 1) {
-          const opusData = bytes.slice(5);
-          decodeOpus(opusData);
-        } else {
-          playPcm(event.data);
-        }
+        if (state.isListening) playPcm(event.data);
       };
     }
 

src/recorder.ts

@@ -176,7 +176,6 @@ export async function startRecording(
         onPacket: (chunk) => {
           if (chunk.length < 8) return;
           segmentManager.rotateIfNeeded(oggPacketStream);
-          broadcaster.broadcastOpusToWeb?.(chunk, userId);
           if (!broadcaster.broadcastPcmToWeb) return;
           decoder.rotateIfNeeded();
           decoder.write(chunk);

src/types.ts

@@ -42,7 +42,6 @@ export interface SegmentMetadata extends UserMetadata {
 
 export interface PcmBroadcaster {
   broadcastPcmToWeb?: (chunk: Buffer, userId: string) => void;
-  broadcastOpusToWeb?: (chunk: Buffer, userId: string) => void;
   updateActiveUser?: (
     userId: string,
     data: { username: string; avatar: string; speaking: boolean },

src/webserver.ts

@@ -238,22 +238,6 @@ export function startWebserver(
     });
   };
 
-  // Inbound: Discord Opus → tagged chunks → browser (WebCodecs decode)
-  (global as any).broadcastOpusToWeb = (chunk: Buffer, userId: string) => {
-    let hash = 0;
-    for (let i = 0; i < userId.length; i++) {
-      hash = (hash << 5) - hash + userId.charCodeAt(i);
-      hash |= 0;
-    }
-    const header = Buffer.alloc(5);
-    header.writeUInt8(1, 0); // mode: 1 = Opus
-    header.writeInt32LE(hash, 1);
-    const packet = Buffer.concat([header, chunk]);
-    wsClients.forEach((client) => {
-      if (client.readyState === 1) client.send(packet);
-    });
-  };
-
   (global as any).updateActiveUser = (
     userId: string,
     data: { username: string; avatar: string; speaking: boolean },