fix: harden Protobuf Deserialization and Refactor Utilities (#1820)

* refactor: reorganize browser utility functions and improve buffer handling

* fix: harden protobuf deserialization and clean up code

* refactor: simplify data handling in GroupCipher and SenderKey classes

* fix: Ensure consistent Buffer hydration and remove redundant code

* refactor: update decodeAndHydrate calls to use proto types for improved type safety

src/Socket/socket.ts

@@ -28,11 +28,12 @@ import {
 	getCodeFromWSError,
 	getErrorCodeFromStreamError,
 	getNextPreKeysNode,
-	getPlatformId,
 	makeEventBuffer,
 	makeNoiseHandler,
 	promiseTimeout
 } from '../Utils'
+import { getPlatformId } from '../Utils/browser-utils'
+import { decodeAndHydrate } from '../Utils/proto-utils'
 import {
 	assertNodeErrorFree,
 	type BinaryNode,
@@ -342,7 +343,7 @@ export const makeSocket = (config: SocketConfig) => {
 		const init = proto.HandshakeMessage.encode(helloMsg).finish()
 
 		const result = await awaitNextMessage<Uint8Array>(init)
-		const handshake = proto.HandshakeMessage.decode(result)
+		const handshake = decodeAndHydrate(proto.HandshakeMessage, result)
 
 		logger.trace({ handshake }, 'handshake recv from WA')