[Feature]: No way to pause an inline video after scrolling away from it #23749

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

apps/web

Steps to reproduce

1. On 0.1.2-nightly.20261021.3499 (macOS, desktop app), open a long thread where the agent embeds several generated videos in its replies.
2. Play one of the inline videos.
3. Scroll the thread far away from it. A mouse with free-spinning scroll (Logitech MX Master 4) moves hundreds of messages in one flick.

Expected behavior

While an inline video is playing, I can pause it without finding it again. Any one of these would do:

• A small "now playing" control (pause, and jump back to the message) that stays visible while the playing video is off-screen.
• The video moves to a floating player when it scrolls out of view, as YouTube does.
• The Mac's play/pause key, Control Center, and AirPods controls pause it reliably, through the OS media session.

Actual behavior

• The video keeps playing off-screen, and nothing in the UI shows where it is.
• The Mac's play/pause key does not reach it. I started the inline video in T3 Code after a YouTube video in my default browser, then pressed play/pause. macOS sent the key to the browser and played the YouTube video. The T3 Code video kept playing.
• The only way to stop it is to scroll back through the thread looking for it. In a long thread with many embedded videos, that took minutes.

Impact

Minor bug or occasional failure

Workaround

Pause each video before scrolling away.