Adding a thread bubble is hidden when there is an existing comment on a line of code
## Proposal Make it clear on how to add a thread versus viewing existing open comments in diffs 1. Reposition the add thread button to the area between the line numbers and +/- 1. Update avatar to a button to show comments per line ![image](/uploads/bd374e875dca507075d1907a88a12b5d/image.png) ### Problem Problem is that the button to add a thread is hidden when you go over a line with an existing comment. > `@ms.mondrian` duo reviewer comment is blocking the UI to start the thread on the same line ![CleanShot_2025-08-26_at_14.38.21](/uploads/020e84cd98e722be295bdc4ae8b702fd/CleanShot_2025-08-26_at_14.38.21.mp4) ### Designs 1. Mockups - [Walkthrough to leave feedback](https://gitlab.com/gitlab-org/gitlab/-/issues/573104/designs/1_-_start.png) 2. [Figma](https://www.figma.com/design/0ABBYYEvZTroTREb7yydtk/Comments-and-Diffs?node-id=52-83391&t=qANgP6E98O5O1uvw-1) 3. [Explorations](https://www.figma.com/design/0ABBYYEvZTroTREb7yydtk/Comments-and-Diffs?node-id=52-89178&t=qANgP6E98O5O1uvw-1) 4. [Prototype](https://www.figma.com/make/ADWuKnKfGHdC9E0jPoBjfp/Commenting-Prototype--Left-actions-?node-id=0-1&t=1MzAabt2w4X59Xxw-1) ![CleanShot_2025-10-01_at_00.44.37](/uploads/13509e04007d2d819cd87eee87a744d7/CleanShot_2025-10-01_at_00.44.37.mp4)
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