Fix nested brace handling in LaTeX definition parser

[Copilot]

The regex pattern r'\\definition\{([^}]+)\}\{([^}]+)\}' fails on nested braces, stopping at the first } encountered. This breaks parsing of definitions like \definition{term}{text with \emph{nested} braces}.

Changes

• Added _extract_latex_arg() method using depth-counting algorithm to properly match braces
• Refactored _extract_definitions() to use the parser instead of regex
• Handles escaped characters (\\{, \\}) correctly

Example

# Before: Would extract only "text with \emph{nested"
# After: Correctly extracts full definition
\definition{Complex Term}{Definition with \emph{nested} braces}
\definition{Formatted}{Text with \textbf{bold} and \emph{italic} markup}

The parser tracks brace depth and only terminates when depth returns to zero, ensuring all nested structures are captured.

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