Dollar fix: 5,634 questions had a lone $ before \( or $$ from the
source data. fix_single_dollar now strips any orphan single $ while
preserving $$..$$ display pairs; the live tablet DB was patched in
place and the importer inherits the fix.
UI: removed the non-functional 'previous year paper' mode card, the
complete-syllabus button, the tick glyph inside filter pills, and the
'2025 Syllabus' badge beside the header title. Question count pills
replaced by a plain number input (5-75). Checked chapters now show a
blue left-edge highlight so a second click visibly deselects; checked
subtopics tint blue the same way.
Source data wraps every math fragment in display-mode $$ delimiters,
which KaTeX rendered as centered blocks mid-sentence. scripts/fix_math.py
normalizes the corpus: $$/$ pairs become inline \\(...\\) (block
derivations with newlines or environments stay display), legacy
\\matrix blocks become begin/end matrix, _\\limits/^\\limits,
\\raise/\\lower boxes, \\root/\\of, \\tag and \\, are rewritten
to KaTeX-supported forms. Batch-validated 60k inline spans: 99.98% render
clean; remaining handful are source pathologies that degrade to text.
import_examgoal.py runs the same normalization at write time.
