[Feature]: LaTeX export — copy position as skak/chessboard package markup

[BilgeGates]

What problem does this solve?

Chess book authors, academic paper writers, and tournament bulletin designers use LaTeX for professional typesetting. To include a chess diagram they currently must manually convert a FEN to LaTeX markup — a tedious, error-prone step that breaks the workflow.

Proposed solution

Add a Copy as LaTeX action that generates ready-to-paste markup for the two most common LaTeX chess packages.

skak package output:

\usepackage{skak}
\fenboard{rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1}
\showboard

chessboard package output:

\usepackage{chessboard}
\chessboard[setfen=rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1]

Scope for this release:

• Copy to clipboard button with package selector (skak / chessboard)
• Board orientation (flip) respected in output
• Works from the main board editor and Advanced FEN page

Out of scope:

• Move list / annotation markup
• Direct PDF generation
• Other packages (xskak, chessfss)

Who needs this

Chess book authors, FIDE publication designers, academic researchers, and puzzle composers submitting to printed journals. Niche audience but zero alternatives exist in browser-based chess tools.

Before submitting

• I searched existing requests and this is not a duplicate.