Call Typst binary directly for compile and SyncTeX support

Instead of going through 'quarto typst compile' (which intercepts
--synctex before it reaches Typst), call the Typst binary bundled in
the Quarto .deb directly at /opt/quarto/bin/tools/x86_64/typst.

This allows passing --synctex output.synctex.gz to generate the SyncTeX
file for bidirectional editor↔PDF sync.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

services/clsi/app/js/TypstRunner.js

@@ -7,11 +7,15 @@ import fs from 'node:fs'
 // Maps currently-running Typst jobs: compileName → PID (or docker container id)
 const ProcessTable = {}
 
-// Compiles a standalone Typst document (.typ) straight to output.pdf. We reuse
-// the Typst that ships inside Quarto via `quarto typst compile`, so there is no
-// extra binary to install. This is deliberately the simplest of the three
-// runners: Typst only ever produces a PDF, so there is no format detection,
-// no HTML asset directory and no extension merging (cf. QuartoRunner).
+// Path to the Typst binary bundled inside the Quarto .deb installation.
+const TYPST_BIN = '/opt/quarto/bin/tools/x86_64/typst'
+
+// Compiles a standalone Typst document (.typ) straight to output.pdf. We call
+// the Typst binary that ships inside Quarto directly (rather than going through
+// `quarto typst compile`) so we can pass --synctex for bidirectional sync.
+// This is deliberately the simplest of the three runners: Typst only ever
+// produces a PDF, so there is no format detection, no HTML asset directory
+// and no extension merging (cf. QuartoRunner).
 function runTypst(compileName, options, callback) {
   const { directory, mainFile, image, environment, compileGroup } = options
   const timeout = options.timeout || 60000
@@ -61,7 +65,7 @@ function _buildTypstCommand(mainFile) {
   // --synctex generates output.synctex.gz alongside the PDF, enabling
   // bidirectional editor↔PDF sync (same infrastructure as LaTeX SyncTeX).
   const inputPath = `$COMPILE_DIR/${mainFile}`
-  const cmd = `quarto typst compile --synctex output.synctex.gz ${inputPath} output.pdf 2>&1`
+  const cmd = `${TYPST_BIN} compile --synctex output.synctex.gz ${inputPath} output.pdf 2>&1`
   return ['/bin/sh', '-c', cmd]
 }