SCIX-819 fix(abstract): prevent truncation of math-heavy abstracts

[thostetler]

Abstracts containing LaTeX math notation like $10<z_\mathrm{phot}<12$ were being
truncated because the browser HTML parser interpreted < and > inside math
delimiters as HTML tags, corrupting the DOM.

• Add escapeMathHtml utility to escape < and > inside $...$ and $$...$$ delimiters
• Create SafeAbstract component with ErrorBoundary fallback for graceful degradation
• Update abstract page and search result previews to use SafeAbstract
• Add unit and integration tests including the real problematic abstract

[codecov]

Codecov Report

❌ Patch coverage is 95.94595% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.1%. Comparing base (e5ef845) to head (d4b47b4).

Files with missing lines	Patch %	Lines
src/utils/abstract/escape-math-html.ts	90.0%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #780     +/-   ##
========================================
+ Coverage    61.0%   61.1%   +0.1%     
========================================
  Files         302     304      +2     
  Lines       35244   35318     +74     
  Branches     1528    1533      +5     
========================================
+ Hits        21494   21563     +69     
- Misses      13714   13719      +5     
  Partials       36      36             

Files with missing lines	Coverage Δ
src/components/SafeAbstract/SafeAbstract.tsx	100.0% <100.0%> (ø)
src/utils/abstract/escape-math-html.ts	90.0% <90.0%> (ø)

... and 1 file with indirect coverage changes

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