chat-utils: add fallbacks for contact name extraction

Apply consistent fallback pattern for contact names:
- chat-utils.ts: fullName || firstName || username for lidContactAction
- sync-action-utils.ts: fullName || firstName || username for processContactAction

Ensures contact names are extracted regardless of which field WhatsApp populates.

src/Utils/chat-utils.ts

@@ -930,7 +930,11 @@ export const processSyncAction = (
 		ev.emit('contacts.upsert', [
 			{
 				id: id!,
-				name: action.lidContactAction.fullName || undefined,
+				name:
+					action.lidContactAction.fullName ||
+					action.lidContactAction.firstName ||
+					action.lidContactAction.username ||
+					undefined,
 				lid: id!,
 				phoneNumber: undefined
 			}

src/Utils/sync-action-utils.ts

@@ -45,7 +45,7 @@ export const processContactAction = (
 		data: [
 			{
 				id,
-				name: action.fullName || undefined,
+				name: action.fullName || action.firstName || action.username || undefined,
 				lid: lidJid || undefined,
 				phoneNumber
 			}

src/__tests__/Utils/sync-action-utils.test.ts

@@ -2,7 +2,6 @@ import { jest } from '@jest/globals'
 import type { ILogger } from '../../Utils/logger'
 import { processContactAction } from '../../Utils/sync-action-utils'
 
-
 describe('processContactAction', () => {
 	const mockLogger: ILogger = {
 		warn: jest.fn(),