Fix a channel that stopped receiving messages

If messages do not appear in Chats, investigate the channel connection; if they appear without a reply, investigate AI controls.

What to do

1. 1

   For WhatsApp, verify the linked device and reconnect with a fresh QR when needed.

2. 2

   For Messenger, test the Page token, webhook verification, subscriptions, and app mode.

3. 3

   For website chat, verify enablement, allowed domains, current snippet, and browser blockers.

Open Fix a channel that stopped receiving messages