feat: Add Chat Trigger node (#7409)

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>
Co-authored-by: Jan Oberhauser <jan.oberhauser@gmail.com>
Co-authored-by: Jesper Bylund <mail@jesperbylund.com>
Co-authored-by: OlegIvaniv <me@olegivaniv.com>
Co-authored-by: Deborah <deborah@starfallprojects.co.uk>
Co-authored-by: Jan Oberhauser <janober@users.noreply.github.com>
Co-authored-by: Jon <jonathan.bennetts@gmail.com>
Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <aditya@netroy.in>
Co-authored-by: Michael Kret <88898367+michael-radency@users.noreply.github.com>
Co-authored-by: Giulio Andreini <andreini@netseven.it>
Co-authored-by: Mason Geloso <Mason.geloso@gmail.com>
Co-authored-by: Mason Geloso <hone@Masons-Mac-mini.local>
Co-authored-by: Mutasem Aldmour <mutasem@n8n.io>

packages/@n8n/chat/README.md

@@ -2,9 +2,9 @@
 This is an embeddable Chat widget for n8n. It allows the execution of AI-Powered Workflows through a Chat window.
 
 ## Prerequisites
-Create a n8n workflow which you want to execute via chat. The workflow has to be triggered using a **Webhook** node and return data using the **Respond to Webhook** node.
+Create a n8n workflow which you want to execute via chat. The workflow has to be triggered using a **Chat Trigger** node.
 
-Open the **Webhook** node and add your domain to the **Domain Allowlist** field. This makes sure that only requests from your domain are accepted.
+Open the **Chat Trigger** node and add your domain to the **Allowed Origins (CORS)** field. This makes sure that only requests from your domain are accepted.
 
 [See example workflow](https://github.com/n8n-io/n8n/blob/master/packages/%40n8n/chat/resources/workflow.json)
 
@@ -17,8 +17,6 @@ Each request is accompanied by an `action` query parameter, where `action` can b
 - `loadPreviousSession` - When the user opens the Chatbot again and the previous chat session should be loaded
 - `sendMessage` - When the user sends a message
 
-We use the `Switch` node to handle the different actions.
-
 ## Installation
 
 Open the **Webhook** node and replace `YOUR_PRODUCTION_WEBHOOK_URL` with your production URL. This is the URL that the Chat widget will use to send requests to.
@@ -106,6 +104,10 @@ createChat({
 	},
 	target: '#n8n-chat',
 	mode: 'window',
+	chatInputKey: 'chatInput',
+	chatSessionKey: 'sessionId',
+	metadata: {},
+	showWelcomeScreen: false,
 	defaultLanguage: 'en',
 	initialMessages: [
 		'Hi there! 👋',
@@ -148,6 +150,21 @@ createChat({
   - In `window` mode, the Chat window will be embedded in the target element as a chat toggle button and a fixed size chat window.
   - In `fullscreen` mode, the Chat will take up the entire width and height of its target container.
 
+### `showWelcomeScreen`
+- **Type**: `boolean`
+- **Default**: `false`
+- **Description**: Whether to show the welcome screen when the Chat window is opened.
+
+### `chatSessionKey`
+- **Type**: `string`
+- **Default**: `'sessionId'`
+- **Description**: The key to use for sending the chat history session ID for the AI Memory node.
+
+### `chatInputKey`
+- **Type**: `string`
+- **Default**: `'chatInput'`
+- **Description**: The key to use for sending the chat input for the AI Agent node.
+
 ### `defaultLanguage`
 - **Type**: `string`
 - **Default**: `'en'`