I’ve used Timing app on macos before I moved to linux and really liked the way they show details instantly when you hover a section in the timeline.
I’ve been using ActivityWatch for a while now and I really like it, but something I use a lot is to verify window titles (for example to know on which branch I was working on a specific hour in the day) so I just move my mouse over a timeline entry and check the title that was in place at that moment. I configured most of my apps to show more context in title windows so it makes this verification step quite fast.
Something that slows me down is the fact that the small hover window is showing only after a delay, but I would really like it to be instant.
I took a quick look at the code and this is the .vis-tooltip in the dom and is controlled by vis-timeline package in https://github.com/ActivityWatch/aw-webui