feat: OG Image in Chatwoot Help Center (#11826)

_Note: This is only available for Cloud version of Chatwoot._



![image](https://github.com/user-attachments/assets/b7d61035-8682-4dbd-9460-4f8546ca6a98)

app/helpers/portal_helper.rb

@@ -1,4 +1,21 @@
 module PortalHelper
+  def set_og_image_url(portal_name, title)
+    cdn_url = GlobalConfig.get('OG_IMAGE_CDN_URL')['OG_IMAGE_CDN_URL']
+    return if cdn_url.blank?
+
+    client_ref = GlobalConfig.get('OG_IMAGE_CLIENT_REF')['OG_IMAGE_CLIENT_REF']
+
+    uri = URI.parse(cdn_url)
+    uri.path = '/og'
+    uri.query = URI.encode_www_form(
+      clientRef: client_ref,
+      title: title,
+      portalName: portal_name
+    )
+
+    uri.to_s
+  end
+
   def generate_portal_bg_color(portal_color, theme)
     base_color = theme == 'dark' ? 'black' : 'white'
     "color-mix(in srgb, #{portal_color} 20%, #{base_color})"