fix(org-latex): macOS PDF export - open async + latexmk nonstopmode

- org-file-apps: use 'open %s' for PDF on darwin → async launch, no beachball
- org-latex-pdf-process: explicit latexmk -f -interaction=nonstopmode
  (belt+suspenders; Doom module sets this but not always loaded early enough)

config.el

@@ -369,6 +369,22 @@ Bound to cmd+v in org-mode and markdown-mode."
 ;; Optional: enable booktabs style (horizontal rules in tables)
 ;; (setq org-latex-tables-booktabs t)
 
+;; macOS: open exported PDF with system 'open' (async → no beachball)
+;; Without this, org-open-file may call open synchronously or fail silently.
+(when (eq system-type 'darwin)
+  (setq org-file-apps
+        '((auto-mode  . emacs)
+          (directory  . emacs)
+          ("\\.mm\\'" . default)
+          ("\\.x?html?\\'" . default)
+          ("\\.pdf\\'" . "open %s"))))
+
+;; Ensure latexmk doesn't hang on errors (nonstopmode + force-continue)
+;; Doom latex module usually sets this, but belt+suspenders for macOS.
+(after! org
+  (setq org-latex-pdf-process
+        '("latexmk -f -pdf -%latex -interaction=nonstopmode -output-directory=%o %f")))
+
 
 ;;; ============================================================
 ;;; ORG MODE — CUSTOM BEHAVIOR