Recent-attempts widget on /exam-prep/:examKey was showing raw LaTeX
like '\dfrac{7}{9}' because stripPreview only removed HTML tags.
Now it also converts common LaTeX to readable unicode (fractions →
a/b, \sqrt → √, \cdot → ·, comparisons → ≤≥≠, Greek letters, etc.)
before truncating.
KaTeX rendering would be overkill for a 100-char preview row; this
just makes the existing text legible.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Maxim Dolgolyov
c3d6af8757