Learnings

Seeded text displayed raw HTML & unstyled backticks

Context: The format_learning_body helper used sanitize: false to preserve <strong> tags, but this also allowed other raw HTML from the source text (like <input>) to render. Backticks (`) were preserved but had no special styling.
Resolution: I modified the format_learning_body helper:
1. Escape all HTML first (ERB::Util.html_escape).
2. Bold keywords (<strong>) on escaped string.
3. Wrap backticked content () with <code>` tags on bolded string.
4. Apply simple_format(..., sanitize: false) last.
5. Added CSS for code tag.
Learning: When displaying potentially unsafe text that also needs specific safe HTML formatting, I learned the order matters: Escape first, then selectively add safe tags, then apply structural formatting (like simple_format with sanitize: false).