Add SyncTeX support for Typst projects

- TypstRunner: add --synctex output.synctex.gz to quarto typst compile,
  generating a synctex file alongside the PDF (requires Typst 0.11+,
  bundled in Quarto 1.5+).
- use-synctex: extend the root-doc guard from LaTeX-only to also cover
  .typ files, enabling the Show in PDF / Show in code buttons for Typst.

The rest of the sync infrastructure (OutputCacheManager, synctex binary,
SynctexOutputParser, CLSI routes) is already format-agnostic.

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

services/clsi/app/js/TypstRunner.js

@@ -58,8 +58,10 @@ function _buildTypstCommand(mainFile) {
   // is merged into stdout (2>&1). LocalCommandRunner replaces $COMPILE_DIR
   // before the shell sees it; the output path is relative because the shell
   // CWD is already the compile directory.
+  // --synctex generates output.synctex.gz alongside the PDF, enabling
+  // bidirectional editor↔PDF sync (same infrastructure as LaTeX SyncTeX).
   const inputPath = `$COMPILE_DIR/${mainFile}`
-  const cmd = `quarto typst compile ${inputPath} output.pdf 2>&1`
+  const cmd = `quarto typst compile ${inputPath} output.pdf --synctex output.synctex.gz 2>&1`
   return ['/bin/sh', '-c', cmd]
 }
 

services/web/frontend/js/features/pdf-preview/hooks/use-synctex.ts

@@ -176,11 +176,13 @@ export default function useSynctex(): {
     positionRef.current = position
   }, [position])
 
-  // SyncTeX only works for LaTeX projects (requires output.synctex.gz).
-  // Typst and Quarto do not produce this file.
-  const LATEX_EXTENSIONS_RE = /\.(tex|ltx|Rtex|Rnw)$/i
+  // SyncTeX works for LaTeX and Typst projects — both produce output.synctex.gz.
+  // Quarto does not (its intermediate files make path mapping unreliable).
+  const SYNCTEX_EXTENSIONS_RE = /\.(tex|ltx|Rtex|Rnw|typ)$/i
   const rootDocPath = rootDocId ? pathInFolder(rootDocId) : null
-  const isLatexRootDoc = rootDocPath ? LATEX_EXTENSIONS_RE.test(rootDocPath) : false
+  const isSynctexRootDoc = rootDocPath
+    ? SYNCTEX_EXTENSIONS_RE.test(rootDocPath)
+    : false
 
   const _syncToCode = useCallback(
     ({
@@ -192,7 +194,7 @@ export default function useSynctex(): {
       selectText?: string
       visualOffset?: number
     }) => {
-      if (!isLatexRootDoc || !position) {
+      if (!isSynctexRootDoc || !position) {
         return
       }
 
@@ -245,7 +247,7 @@ export default function useSynctex(): {
         })
     },
     [
-      isLatexRootDoc,
+      isSynctexRootDoc,
       pdfFile,
       clsiServerId,
       projectId,
@@ -290,7 +292,7 @@ export default function useSynctex(): {
   }, [selectedEntities, setHasSingleSelectedDoc])
 
   const canSyncToPdf: boolean =
-    isLatexRootDoc &&
+    isSynctexRootDoc &&
     hasSingleSelectedDoc &&
     !!cursorPosition &&
     !!openDocName