Force XeLaTeX via latexmk -pdf -pdflatex=xelatex (keep -f and nonstop)

app.py

@@ -435,12 +435,12 @@ def _compile_poster_pdf(OUTPUT_DIR: Path, logs):
         pretex = r"\nonstopmode\scrollmode\makeatletter\let\pgf@error\pgf@warning\let\GenericError\GenericWarning\let\PackageError\PackageWarning\makeatother"
         if _has("latexmk"):
             cmd = [
-                "latexmk", "-xelatex", "-pdf", "-f",
+                "latexmk", "-pdf", "-pdflatex=xelatex", "-f",
                 "-interaction=nonstopmode", "-file-line-error",
                 f"-pretex={pretex}",
                 tex_path.name,
             ]
-            logs.append("▶ Compiling with latexmk (-xelatex, -f, pretex demote errors) …")
+            logs.append("▶ Compiling with latexmk (-pdf -pdflatex=xelatex -f, pretex demote errors) …")
         elif _has("xelatex"):
             # Inject pretex macros via direct input to engine (no file mutation)
             injected = pretex + f"\\input{{{tex_path.name}}}"
@@ -511,12 +511,12 @@ def _compile_tex_to_pdf(tex_path: Path, logs):
         pretex = r"\nonstopmode\scrollmode\makeatletter\let\pgf@error\pgf@warning\let\GenericError\GenericWarning\let\PackageError\PackageWarning\makeatother"
         if _has("latexmk"):
             cmd = [
-                "latexmk", "-xelatex", "-pdf", "-f",
+                "latexmk", "-pdf", "-pdflatex=xelatex", "-f",
                 "-interaction=nonstopmode", "-file-line-error",
                 f"-pretex={pretex}",
                 tex_path.name,
             ]
-            logs.append("▶ Compiling with latexmk (-xelatex, -f, pretex demote errors) …")
+            logs.append("▶ Compiling with latexmk (-pdf -pdflatex=xelatex -f, pretex demote errors) …")
         elif _has("xelatex"):
             injected = pretex + f"\\input{{{tex_path.name}}}"
             cmd = ["xelatex", "-interaction=nonstopmode", "-file-line-error", injected]