Add timeline comments with agent resolution

[virang-nimrobo]

Problem

Studio has no durable way to leave timeline-specific edit requests and hand them off to a coding agent.

Proposed solution

Add source-backed timeline comments in Studio, a compact comments tray with timeline markers, and a Superconnector bridge to send comments to the configured coding agent for resolution. Keeps existing copy actions and adds stop support for running agent requests.

Let me know if this makes sense. I will raise a PR for it then

hyperframe-comment.mp4

Alternatives considered

No response

Additional context

No response

[miguel-heygen]

we'll make some preview improvements first, very good idea! after landing the changes, I'll comment here again and you can try to make a PR for it!

[miguel-heygen]

landed the preview improvements, you can try to make a pr for it, maybe we don't merge it internally but let's see what you come up with!

[virang-nimrobo]

Sure! Let me make a pr and then we can discuss