Typst writer: map \cap from deprecated sect to inter

[SathyaTadinada]

Summary

Fix LaTeX -> Typst math output for intersection symbols:

• \cap now emits inter (instead of deprecated sect)
• \bigcap now emits inter.big (instead of deprecated sect.big)

What changed

• Added a small post-processing step in the Typst writer math path to normalize deprecated symbol names.
• Added regression tests for inline and display intersection output.

Files

• src/Text/Pandoc/Writers/Typst.hs
• test/command/typst-math-intersection.md

Repro

pandoc -f latex -t typst

Input

$\cap$
$$\bigcap_{i=1}^n A_i$$

Expected Output

$inter$
$ inter.big_(i = 1)^n A_i $

Testing

Ran:

cabal test pandoc:test-pandoc --with-compiler="$HOME/.ghcup/ghc/9.12.2/bin/ghc" --test-options='-p typst-math-intersection'

Result: Both test cases passed.

Closes #11591.

Upstream context

Pandoc currently gets Typst math symbol names from texmath.
Related upstream tracking: jgm/texmath#287
Upstream fix PR: jgm/texmath#288
This Pandoc change is a compatibility normalization until upstream mapping is fixed/released.

[jgm]

I'd consider an upstream change but not this kind of local patching.