feat(Chat Trigger Node): Fix CSS variable --chat--message--font-size not applying correctly (#16310)

packages/@n8n/nodes-langchain/nodes/trigger/ChatTrigger/README.md

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+# ChatTrigger Local Development
+
+This guide explains how to set up local development for the ChatTrigger node when working with the chat bundle.
+
+## Prerequisites
+
+Since the chat bundle is loaded via `<script type="module">`, it needs to be served over HTTPS for local development.
+
+## Setup Instructions
+
+### 1. Install HTTP Server
+
+Install the http-server globally:
+
+```bash
+npm install -g http-server
+```
+
+### 2. Generate SSL Certificate
+
+Generate a self-signed certificate for HTTPS:
+
+```bash
+openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365 -nodes
+```
+
+### 3. Build the Chat Bundle
+
+Navigate to the chat package and build it:
+
+```bash
+cd packages/frontend/@n8n/chat && pnpm run build 
+```
+
+### 4. Start HTTPS Server
+
+Run the HTTPS server to serve the chat bundle:
+
+```bash
+http-server packages/frontend/@n8n/chat/dist -g -S -C cert.pem -K key.pem --port 8443 --cors
+```
+
+### 5. Update Import Paths
+
+Modify the import paths in `templates.ts` to point to your local server:
+
+```html
+<script type="module">
+    import { createChat } from 'https://127.0.0.1:8443/chat.bundle.es.js';
+```
+
+```html
+<link href="https://127.0.0.1:8443/chat.css" rel="stylesheet" />
+```