Revert QuartoRunner: restore --output output.pdf

The previous compile logs confirm Quarto handles --to typst --output
output.pdf correctly: pandoc produces main.typ, typst compiles it to
main.pdf, then Quarto renames to output.pdf. The mv-based approach was
unnecessary and incorrect.

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

services/clsi/app/js/QuartoRunner.js

@@ -53,17 +53,8 @@ function _buildQuartoCommand(mainFile) {
   // Quarto writes all progress and error messages to stderr; without this
   // the log panel would be empty on failure.
   // LocalCommandRunner replaces $COMPILE_DIR before the shell sees it.
-  //
-  // Do NOT pass --output: combining --to typst with --output *.pdf causes
-  // Quarto to write a Typst source file (.typ) with a .pdf extension instead
-  // of running the full typst→PDF pipeline. Instead, let Quarto name the PDF
-  // after the source file (main.qmd → main.pdf) and rename it afterwards.
   const inputPath = `$COMPILE_DIR/${mainFile}`
-  const pdfName = mainFile.replace(/\.[^/.]+$/, '') + '.pdf'
-  const renderedPdf = `$COMPILE_DIR/${pdfName}`
-  const cmd =
-    `quarto render ${inputPath} --to typst 2>&1 && ` +
-    `mv ${renderedPdf} $COMPILE_DIR/output.pdf`
+  const cmd = `quarto render ${inputPath} --to typst --output output.pdf 2>&1`
   return ['/bin/sh', '-c', cmd]
 }