Done! Thanks for bringing this up again. This was planned a long time ago, but I totally forgot about it…
This is how it should look:
(The comments in this image are fake from my private test version)
If you have comments in any of your builds, the little bell will appear. Clicking on it will go to a notification page like in the image. When you visit any of your builds with comments, those will be marked as read and auto removed from the notifications.