Studio: focus the comment text box after placing a comment on the video #6348

When I select a place on the video to leave a comment in HyperFrames Studio, the comment text box does not receive keyboard focus. I have to click the text box separately before I can type.

Steps from the reported workflow:

1. Open a video in Studio and enter Comment mode.
2. Select a location on the video for a new comment.
3. Start typing without clicking the text box.

Expected: creating the comment at that location immediately focuses its text input, so typing enters the comment. Actual: a second click inside the text box is required.

This is a user-reported interaction on HyperFrames Desktop on Linux, Omarchy/Hyprland. The inspected installation is production b482, desktop package 0.1.0 with bundled HyperFrames 0.8.198. No new comment was submitted or live UI reproduction performed during diagnosis, and the underlying focus-loss cause is unverified.

Please focus the new comment input after the placement gesture completes. This report concerns the local video-comment workflow, rather than agent-chat attachments or image support. I found no matching open or closed focus issue. #749 concerns the original timeline-comment feature, not this focus behavior.