Share links to labels and mailboxes in comments
You can now copy a shareable link to any label or mailbox and paste it into a comment. The link renders inline as a clickable token using the label or mailbox’s display name, so teammates can jump to the right view without needing directions. This helps when:

Inline signature switcher in the composer
A new "Signature" button now appears in the top-right corner of the signature area when you hover over it or place your cursor inside. Choose a different signature without changing the From address. A dashed outline around the signature also makes it clear when you're editing that area, helping prevent accidental changes.

Update conversations through the API without posting a comment
A new endpoint on the public REST API lets you close, reopen, assign, label, recolor, rename, or move conversations without creating a post in the thread. Useful when you want to automate housekeeping from your own tools, sync state from a CRM, or trigger label-change rules from a script, all without cluttering the conversation with system comments.
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