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/Utils/process-message.ts

@@ -19,6 +19,7 @@ import { aesDecryptGCM, hmacSign } from './crypto'
 import { toNumber } from './generics'
 import { downloadAndProcessHistorySyncNotification } from './history'
 import type { ILogger } from './logger'
+import { decodeAndHydrate } from './proto-utils'
 
 type ProcessMessageContext = {
 	shouldProcessHistoryMsg: boolean
@@ -271,7 +272,7 @@ const processMessage = async (
 						const { placeholderMessageResendResponse: retryResponse } = result
 						//eslint-disable-next-line max-depth
 						if (retryResponse) {
-							const webMessageInfo = proto.WebMessageInfo.decode(retryResponse.webMessageInfoBytes!)
+							const webMessageInfo = decodeAndHydrate(proto.WebMessageInfo, retryResponse.webMessageInfoBytes!)
 							// wait till another upsert event is available, don't want it to be part of the PDO response message
 							setTimeout(() => {
 								ev.emit('messages.upsert', {
@@ -305,8 +306,10 @@ const processMessage = async (
 				break
 			case proto.Message.ProtocolMessage.Type.LID_MIGRATION_MAPPING_SYNC:
 				const encodedPayload = protocolMsg.lidMigrationMappingSyncMessage?.encodedMappingPayload!
-				const { pnToLidMappings, chatDbMigrationTimestamp } =
-					proto.LIDMigrationMappingSyncPayload.decode(encodedPayload)
+				const { pnToLidMappings, chatDbMigrationTimestamp } = decodeAndHydrate(
+					proto.LIDMigrationMappingSyncPayload,
+					encodedPayload
+				)
 				logger?.debug({ pnToLidMappings, chatDbMigrationTimestamp }, 'got lid mappings and chat db migration timestamp')
 				const pairs = []
 				for (const { pn, latestLid, assignedLid } of pnToLidMappings) {