Improved 3D editor comments, now with AI

Comments in the 3D editor have been rebuilt: a comments panel, real resolve, unread markers and previews on the canvas. Spline's AI agent can now work from comments too. Ask AI on a thread and it makes the change, looks from the commenter's view and replies with what it did.

Changes

3D editor

• Comments panel - Comment mode opens a panel listing every thread, with participants, reply count and time. Filter by this scene or all scenes, and show resolved threads. Opening a thread switches to its scene and moves the camera to the commenter's view.
• Resolve and reopen - Resolving a thread keeps it instead of deleting it, and you can reopen it later.
• Unread markers - Red dots on pins and in the panel show threads with new replies. Mark threads read or unread.
• Pin previews - Hover a pin to see its first comment and profile photos. Right-click a pin to resolve it, mark it unread or Ask AI.
• Hide comments - Shift+C hides and shows all comments.

AI & agents

• Ask AI on a comment - Send a thread to Spline's AI agent. It makes the change, checks it from the commenter's camera and replies on the thread. It resolves threads only when you ask.
• Comments over MCP - Claude, ChatGPT and other MCP clients can read, reply to and resolve comments.

Fixes

• Comments no longer show over the running scene in the Preview tab.
• Escape closes the open thread.