Consider variable I/O text size, or change default size?

Originally reported on https://forums.ankiweb.net/t/allow-writing-on-images-for-image-cloze-mode/53772/2

Start with the linked forum report, which is the only investigation source named in the issue. The issue does not identify files, tests, or a precise expected behavior, so clarify whether image-cloze input should support variable text size or receive a new default before determining what completion means.

Written by the indexing model from the issue text.