Every piece of educator prose the platform stores is Markdown, and until now
only articles rendered it. A lab panel written as a table reached the quiz player
as a row of literal pipes, which is why the table conversion had to be held back.
`RichText` is now the single renderer: GFM tables, `$…$` maths through KaTeX,
images resolved through the uploads helper, external links opened safely, and
raw HTML escaped rather than executed — a stem can never inject markup into the
page around it. The question bank's `dangerouslySetInnerHTML` is gone with it.
Highlights were the hard part
Manual highlights and the read-aloud cursor are stored as character offsets into
the raw stem, and rendering Markdown destroys the one-to-one map a plain string
gave us. A rehype plugin puts it back: each text node in the output carries the
source offsets it was parsed from, so a highlight saved before this change still
lands exactly where it was drawn, and the selection arithmetic that reads
`data-start` needs no change at all.
Inside an inline-formatted run the rendered text is shorter than its source by
the marker characters, so an offset picked mid-run can be out by a few. Splitting
per text node bounds that to one node and keeps every node boundary exact —
stated in the code, because it is a real limit rather than an oversight.
With that in place the lab tables are applied: 79 stems, 82 panels. Question 3333
now reads as two tables with `3.5 × 10⁹/L` instead of `3.5 x 109/L`, and the
`inEq/L` and `mrnol/L` scanning damage repaired. Each change was snapshotted
first, so it is reversible from the question editor.
Six schematic illustrations
Drawn from scratch as SVG in `scripts/seed_illustrations.py` — bilirubin risk
zones, airway narrowing by level, dehydration bands, the fluid pathway, the
target sign, growth velocity. Each is captioned, tagged and searchable in the
image bank, and each says on its face that it is schematic and not a clinical
reference. They exist so the media library, picker and article figures can be
exercised against real files, and because an article with no figure looks
unfinished even when its prose is not.
234 frontend tests green, 11 of them new on the renderer.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TqXevQJhxFrM7jJg82cgZN
