I've built a similar thing only in VIM. At work I'm spending most of my time in there, so it made sense to make something without any context switching (Toggl or Jira).
BTW, great work, really like the finished product!
I have built a little box of buttons which I can use to record the time I spend on each activity at work. Mostly just for my own amusement. I’ve open sourced the entire concept, software and physical designs.