Assume yesterday for future time

Especially annoying when I am working past midnight and have to adjust back:
Specifying a time then errors out with `Time tracking cannot be set in the future.`

If I only specify a time, it would be sensible to assume yesterday if the time is in the future, that would make my life a whole lot easier!

Start by locating the command-line validation that emits `Time tracking cannot be set in the future.` and trace how an input containing only a time is interpreted. Confirm the desired behavior for future clock times, then add or update coverage so a future time is treated as yesterday and existing future-date errors remain unchanged.

Written by the indexing model from the issue text.