Second this! A 'Finished Yesterday' or logging page progress to yesterday button would be very convenient especially during change of month/year

If this is for saving progress and marking as finished, I totally agree.
I often finish reading after midnight, it update the progress the next day.
Rather than having to go though the Edit Date and Notes page, cycle back through the days (and the month when the month ticks over), save it, a separate button for Save for Yesterday would simplify this common workflow.
Having a Finished Yesterday button for the same scenario also makes sense, as that one is otherwise currently even more involved. In the current workflow you set as Finished, have to edit the date, then the Streak is incorrect and you have to regenerate.