perf(relay): reduce encrypted binary traffic overhead (#2480)

Preserve application frame identity through encryption so negotiated binary traffic avoids base64 expansion while mixed-version peers remain compatible.

packages/client/src/daemon-client-relay-e2ee-transport.ts

@@ -8,15 +8,12 @@ import type {
   DaemonTransportFactory,
   TransportLogger,
 } from "./daemon-client-transport-types.js";
-import {
-  extractRelayMessageData,
-  normalizeTransportPayload,
-} from "./daemon-client-transport-utils.js";
+import { extractRelayMessage, normalizeTransportPayload } from "./daemon-client-transport-utils.js";
 
 type OpenHandler = () => void;
 type CloseHandler = (event?: unknown) => void;
 type ErrorHandler = (event?: unknown) => void;
-type MessageHandler = (data: unknown) => void;
+type MessageHandler = (data: unknown, isBinary: boolean) => void;
 
 export function createRelayE2eeTransportFactory(args: {
   baseFactory: DaemonTransportFactory;
@@ -70,7 +67,7 @@ export function createEncryptedTransport(
     if (closed) {
       return;
     }
-    emitHandlers(messageHandlers, data);
+    emitHandlers(messageHandlers, data, data instanceof ArrayBuffer);
   };
 
   const relayTransport: RelayTransport = {
@@ -115,8 +112,8 @@ export function createEncryptedTransport(
   base.onOpen(() => {
     void startHandshake();
   });
-  base.onMessage((event) => {
-    relayTransport.onmessage?.(extractRelayMessageData(event));
+  base.onMessage((data, isBinary) => {
+    relayTransport.onmessage?.(extractRelayMessage(data, isBinary));
   });
   base.onClose((event) => {
     const record = event as { code?: number; reason?: string } | undefined;