feat: add WhatsApp Web support

[samuelcorsan]

Summary

Adds a WhatsApp Web adapter (@chat-adapter/whatsapp-web) for the Chat SDK. Uses whatsapp-web.js to connect via WhatsApp Web (Puppeteer) and handle messages, reactions, typing, and history.

Features

• Send/receive text, markdown and files
• Add/remove emoji reactions
• Typing indicator via thread.startTyping()
• Message history via adapter.fetchMessages()
• Cards rendered as text fallback
• DMs and group chats
• Reply to message: adapter.replyToMessage(threadId, messageId, content) for native quoted replies
• Media attachments: Lazy-loaded with mimeType/filename from downloadMedia(); send via thread.post({ markdown, files })

Limitations

• No message editing (WhatsApp Web API)
• No webhooks; handleWebhook returns status only
• Requires a long-running Node process (not serverless)
• Uses Puppeteer/headless Chrome

Environment Variables

Variable	Required	Description
WHATSAPP_SESSION_PATH	No	Session storage path (default: .wwebjs_auth)

Test Plan

• Unit tests pass for adapter core (thread IDs, isDM, filtering config)
• Unit tests pass for message filtering (blockedNumbers, allowedNumbers, allowedGroups, requireMentionInGroups)
• Unit tests pass for markdown conversion (*bold*, ~strike~, etc.)
• pnpm typecheck passes
• pnpm check passes
• pnpm knip passes
• pnpm test passes
• Manual testing with WhatsApp (QR scan, send/receive messages, media, reply)

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	qrcode-terminal@​0.12.0
	whatsapp-web.js@​1.34.6

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