Insert personalized smart fields with @ mentions

What changed

Type @ in the message composer to search and insert personalized smart fields for contacts, senders, jobs, and custom CRM data.

Capabilities in this update

• Search smart fields by typing after @
• Browse contact, sender, job, and custom-field suggestions
• Navigate suggestions with the arrow keys
• Insert a field with Enter or Tab
• Close suggestions with Escape
• Recognize categories through consistent icons