feat: add inbound username support and USync username protocol (#382)

* feat: add inbound username support and USync username protocol

Aligns with Baileys upstream PR #2480. WhatsApp is rolling out an
inbound username field that maps to the user's LID. This change is
purely additive — it captures and propagates the new optional field
through types, decoders, USync queries, and group/contact events.

Skipped intentionally to preserve InfiniteAPI's LID/PN customization:
- handleGroupNotification in messages-recv.ts (custom LID->PN flow on
  groups.upsert / participants.map). Username for these specific
  events still flows via process-message's emitParticipantsUpdate
  (reads message.key.participantUsername added in decode-wa-message).

Carousel/buttons code (messages.ts, messages-send.ts) untouched.

Co-Authored-By: Renato Alcara

src/WAUSync/Protocols/USyncContactProtocol.ts

@@ -13,11 +13,37 @@ export class USyncContactProtocol implements USyncQueryProtocol {
 	}
 
 	getUserElement(user: USyncUser): BinaryNode {
-		//TODO: Implement type / username fields (not yet supported)
+		if (user.phone) {
+			return {
+				tag: 'contact',
+				attrs: {},
+				content: user.phone
+			}
+		}
+
+		if (user.username) {
+			return {
+				tag: 'contact',
+				attrs: {
+					username: user.username,
+					...(user.usernameKey ? { pin: user.usernameKey } : {}),
+					...(user.lid ? { lid: user.lid } : {})
+				}
+			}
+		}
+
+		if (user.type) {
+			return {
+				tag: 'contact',
+				attrs: {
+					type: user.type
+				}
+			}
+		}
+
 		return {
 			tag: 'contact',
-			attrs: {},
-			content: user.phone
+			attrs: {}
 		}
 	}
 

src/WAUSync/Protocols/USyncUsernameProtocol.ts

@@ -0,0 +1,28 @@
+import type { USyncQueryProtocol } from '../../Types/USync'
+import { assertNodeErrorFree, type BinaryNode } from '../../WABinary'
+import { USyncUser } from '../USyncUser'
+
+export class USyncUsernameProtocol implements USyncQueryProtocol {
+	name = 'username'
+
+	getQueryElement(): BinaryNode {
+		return {
+			tag: 'username',
+			attrs: {}
+		}
+	}
+
+	getUserElement(user: USyncUser): BinaryNode | null {
+		void user
+		return null
+	}
+
+	parser(node: BinaryNode): string | null {
+		if (node.tag === 'username') {
+			assertNodeErrorFree(node)
+			return typeof node.content === 'string' ? node.content : null
+		}
+
+		return null
+	}
+}

src/WAUSync/Protocols/index.ts

@@ -2,3 +2,4 @@ export * from './USyncDeviceProtocol'
 export * from './USyncContactProtocol'
 export * from './USyncStatusProtocol'
 export * from './USyncDisappearingModeProtocol'
+export * from './USyncUsernameProtocol'

src/WAUSync/USyncQuery.ts

@@ -6,7 +6,8 @@ import {
 	USyncContactProtocol,
 	USyncDeviceProtocol,
 	USyncDisappearingModeProtocol,
-	USyncStatusProtocol
+	USyncStatusProtocol,
+	USyncUsernameProtocol
 } from './Protocols'
 import { USyncUser } from './USyncUser'
 
@@ -137,4 +138,9 @@ export class USyncQuery {
 		this.protocols.push(new USyncLIDProtocol())
 		return this
 	}
+
+	withUsernameProtocol() {
+		this.protocols.push(new USyncUsernameProtocol())
+		return this
+	}
 }

src/WAUSync/USyncUser.ts

@@ -2,6 +2,8 @@ export class USyncUser {
 	id?: string
 	lid?: string
 	phone?: string
+	username?: string
+	usernameKey?: string
 	type?: string
 	personaId?: string
 
@@ -20,6 +22,16 @@ export class USyncUser {
 		return this
 	}
 
+	withUsername(username: string) {
+		this.username = username
+		return this
+	}
+
+	withUsernameKey(usernameKey: string) {
+		this.usernameKey = usernameKey
+		return this
+	}
+
 	withType(type: string) {
 		this.type = type
 		return this