Flashcard UI with hardware keyboard

Using a bluetooth keyboard*, the flashcard testing interface isn't ideal.

I'd expect to be able to press enter to register an answer, but I instead have to <tab> to shift focus to the answer button and press enter to trigger a click. Similarly for button focus on the SRS answer quality ratings (currently, I just press tab 5 times to focus the SRS buttons).

Perhaps the easiest fix would be to listen for enter/return on the text field, and set the focus to the first SRS answer quality button upon answering.

Anyway, a feature request :) Thank you!

* presumably the same behavior with a USB or other hardware keyboards, e.g. Android running in a Chromebook