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/messages.ts

@@ -40,6 +40,7 @@ import {
 	getRawMediaUploadData,
 	type MediaDownloadOptions
 } from './messages-media'
+import { decodeAndHydrate } from './proto-utils'
 
 type MediaUploadData = {
 	media: WAMediaUpload
@@ -156,7 +157,7 @@ export const prepareWAMessageMedia = async (
 		if (mediaBuff) {
 			logger?.debug({ cacheableKey }, 'got media cache hit')
 
-			const obj = WAProto.Message.decode(mediaBuff)
+			const obj = decodeAndHydrate(proto.Message, mediaBuff)
 			const key = `${mediaType}Message`
 
 			Object.assign(obj[key as keyof proto.Message]!, { ...uploadData, media: undefined })
@@ -339,7 +340,7 @@ export const generateForwardMessageContent = (message: WAMessage, forceForward?:
 
 	// hacky copy
 	content = normalizeMessageContent(content)
-	content = proto.Message.decode(proto.Message.encode(content!).finish())
+	content = decodeAndHydrate(proto.Message, proto.Message.encode(content!).finish())
 
 	let key = Object.keys(content)[0] as keyof proto.IMessage