fix: revert ?? '' and defensive null checks across Socket files

PRs 124-129 replaced TypeScript non-null assertions (!) with optional
chaining (?.) and empty string defaults (?? ''). While defensive
programming is usually good, in Signal protocol and WhatsApp binary
node handling code these changes caused:

- Malformed JIDs with empty user components (e.g. @s.whatsapp.net)
- Silent device enumeration failures (messages skip recipients)
- Wrong own-device detection (message routing errors)
- Broken prekey count handling (prekey uploads silently skipped)
- Wrong retry count tracking in Signal protocol

These empty-string defaults are dangerous because Signal session
lookups fail for malformed JIDs, causing "SessionError: No sessions".

Reverted to original Baileys pattern using non-null assertions (!)
which match the upstream reference (infinitezap/Teste_InfiniteAPI).

Files fixed: messages-send.ts, messages-recv.ts, socket.ts, chats.ts,
groups.ts, communities.ts, business.ts

https://claude.ai/code/session_01XaA7GwNaB6azTHFYQ8WEpB

src/Socket/messages-send.ts

@@ -131,11 +131,11 @@ export const makeMessagesSocket = (config: SocketConfig) => {
 				// TODO: explore full length of data that whatsapp provides
 				const node: MediaConnInfo = {
 					hosts: getBinaryNodeChildren(mediaConnNode, 'host').map(({ attrs }) => ({
-						hostname: attrs.hostname ?? '',
-						maxContentLengthBytes: +(attrs.maxContentLengthBytes ?? 0)
+						hostname: attrs.hostname!,
+						maxContentLengthBytes: +attrs.maxContentLengthBytes!
 					})),
-					auth: mediaConnNode.attrs.auth ?? '',
-					ttl: +(mediaConnNode.attrs.ttl ?? 0),
+					auth: mediaConnNode.attrs.auth!,
+					ttl: +mediaConnNode.attrs.ttl!,
 					fetchDate: new Date()
 				}
 				logger.debug('fetched media conn')
@@ -163,7 +163,7 @@ export const makeMessagesSocket = (config: SocketConfig) => {
 		const node: BinaryNode = {
 			tag: 'receipt',
 			attrs: {
-				id: messageIds[0] ?? ''
+				id: messageIds[0]!
 			}
 		}
 		const isReadReceipt = type === 'read' || type === 'read-self'
@@ -268,11 +268,10 @@ export const makeMessagesSocket = (config: SocketConfig) => {
 		}
 
 		for (const { jid, user } of jidsWithUser) {
-			if (!user) continue
 			if (useCache) {
 				const devices =
-					mgetDevices?.[user] ||
-					(userDevicesCache.mget ? undefined : ((await userDevicesCache.get(user)) as FullJid[]))
+					mgetDevices?.[user!] ||
+					(userDevicesCache.mget ? undefined : ((await userDevicesCache.get(user!)) as FullJid[]))
 				if (devices) {
 					const devicesWithJid = devices.map(d => ({
 						...d,
@@ -567,8 +566,8 @@ export const makeMessagesSocket = (config: SocketConfig) => {
 					let msgToEncrypt = patchedMessage
 
 					if (dsmMessage) {
-						const targetUser = jidDecode(jid)?.user ?? ''
-						const ownPnUser = jidDecode(meId)?.user ?? ''
+						const { user: targetUser } = jidDecode(jid)!
+						const { user: ownPnUser } = jidDecode(meId)!
 						const ownLidUser = meLidUser
 
 						const isOwnUser = targetUser === ownPnUser || (ownLidUser && targetUser === ownLidUser)
@@ -1081,7 +1080,7 @@ export const makeMessagesSocket = (config: SocketConfig) => {
 					logger.debug({ to: jid, ownId }, 'Using PN identity for @s.whatsapp.net conversation')
 				}
 
-				const ownUser = jidDecode(ownId)?.user ?? ''
+				const { user: ownUser } = jidDecode(ownId)!
 				if (!participant) {
 					const patchedForReporting = await patchMessageBeforeSending(message, [jid])
 					reportingMessage = Array.isArray(patchedForReporting)
@@ -1099,7 +1098,7 @@ export const makeMessagesSocket = (config: SocketConfig) => {
 
 					if (user !== ownUser) {
 						const ownUserServer = isLid ? 'lid' : 's.whatsapp.net'
-						const ownUserForAddressing = isLid && meLid ? (jidDecode(meLid)?.user ?? '') : (jidDecode(meId)?.user ?? '')
+						const ownUserForAddressing = isLid && meLid ? jidDecode(meLid)!.user : jidDecode(meId)!.user
 
 						devices.push({
 							user: ownUserForAddressing,
@@ -1115,8 +1114,8 @@ export const makeMessagesSocket = (config: SocketConfig) => {
 						// Use conversation-appropriate sender identity
 						const senderIdentity =
 							isLid && meLid
-								? jidEncode(jidDecode(meLid)?.user ?? '', 'lid', undefined)
-								: jidEncode(jidDecode(meId)?.user ?? '', 's.whatsapp.net', undefined)
+								? jidEncode(jidDecode(meLid)?.user!, 'lid', undefined)
+								: jidEncode(jidDecode(meId)?.user!, 's.whatsapp.net', undefined)
 
 						// Enumerate devices for sender and target with consistent addressing
 						const sessionDevices = await getUSyncDevices([senderIdentity, jid], true, false)
@@ -1135,8 +1134,8 @@ export const makeMessagesSocket = (config: SocketConfig) => {
 				const allRecipients: string[] = []
 				const meRecipients: string[] = []
 				const otherRecipients: string[] = []
-				const mePnUser = jidDecode(meId)?.user ?? ''
-				const meLidUser = meLid ? (jidDecode(meLid)?.user ?? null) : null
+				const { user: mePnUser } = jidDecode(meId)!
+				const { user: meLidUser } = meLid ? jidDecode(meLid)! : { user: null }
 
 				// Carousel in DSM wrapper causes error 479 on own devices
 				const isCarouselMsg = isCarouselMessage(message)
@@ -1212,7 +1211,7 @@ export const makeMessagesSocket = (config: SocketConfig) => {
 					attrs: {
 						v: '2',
 						type,
-						count: (participant?.count ?? 0).toString()
+						count: participant!.count.toString()
 					},
 					content: encryptedContent
 				})
@@ -1636,7 +1635,7 @@ export const makeMessagesSocket = (config: SocketConfig) => {
 				throw new Boom('Missing media key for update', { statusCode: 400 })
 			}
 
-			const meId = authState.creds.me?.id ?? ''
+			const meId = authState.creds.me!.id
 			const node = encryptMediaRetryRequest(message.key, mediaKey, meId)
 
 			let error: Error | undefined = undefined
@@ -1713,7 +1712,7 @@ export const makeMessagesSocket = (config: SocketConfig) => {
 			options: MiscMessageGenerationOptions = {}
 		): Promise<AlbumSendResult> => {
 			const startTime = Date.now()
-			const userJid = authState.creds.me?.id ?? ''
+			const userJid = authState.creds.me!.id
 
 			const {
 				medias,
@@ -1868,7 +1867,7 @@ export const makeMessagesSocket = (config: SocketConfig) => {
 
 						// Relay the message
 						await relayMessage(jid, mediaMsg.message, {
-							messageId: mediaMsg.key.id ?? '',
+							messageId: mediaMsg.key.id!,
 							useCachedGroupMetadata: options.useCachedGroupMetadata
 						})
 
@@ -1997,7 +1996,7 @@ export const makeMessagesSocket = (config: SocketConfig) => {
 				)
 			}
 
-			const userJid = authState.creds.me?.id ?? ''
+			const userJid = authState.creds.me!.id
 
 			// Special path for carousel: call relayMessage directly with plain JS object
 			// This matches Pastorini's working approach: