Question blocks
Each section can hold question blocks alongside text and images. Pick a type
from the Add question menu; every type is colour-coded so it's easy to scan
the lesson at a glance. The types, their shape, and their colours live in one
place, src/lib/questions.js, so the editor and both exporters stay in sync.
Questions are rendered into the DOCX (and therefore the printed PDF) with their prompt, options, answer markers, and blank lines, so the exported lesson is ready to print and use.