Very nice, well done! I built something similar (although with far fewer features): https://jameswhoughton.github.io/timetracker/

Some suggestions:

- Have the option to round the times when reporting (for example, at my work we log in 15m increments).

- Have the option to see the combined total grouped by description/tag, e.g. if I'm working on a ticket ABC-123 and I log multiple entries throughout the day, it would be nice to see the total time spent on the ticket without having to manually calculate.

- It could also be useful to add a button to copy the description/tags, for example if you needed to transfer your times to an internal system.