Although we decided to "reduce the button amount" on the side bar, not
only one user reported that the "time tracker dropdown" is not easy to
use.
So the best we can do at the moment is: move the buttons to the sidebar
again.
Fix#34979
None of the frontend js/ts files was touched besides these two commands
(edit: no longer true, I touched one file in
61105d0618
because of a deprecation that was not showing before the rename).
`tsc` currently reports 778 errors, so I have disabled it in CI as
planned.
Everything appears to work fine.
