Use the custom icon chosen instead of the generic document 📄 in flashcard review

I have set the icon of the document below (Document Style > Change Icon) to the French flag emoji, and expected that it would appear in flashcard review as well. This would be a nice-to-have because the icons strengthen recognition of the topic’s context visually when the user has many topics.

In flashcard review:

First asked in Discord: https://discord.com/channels/689979930804617224/719288461231652984/1289991335528632340