fix: add MacPorts + Homebrew to exec-path for GUI Emacs

config.el

@@ -64,9 +64,18 @@
       select-enable-primary t
       inhibit-splash-screen t)
 
-;; PATH: add MacTeX binaries
-(setenv "PATH" (concat "/Library/TeX/texbin:" (getenv "PATH")))
-(add-to-list 'exec-path "/Library/TeX/texbin")
+;; PATH: ensure GUI Emacs sees the same paths as the terminal.
+;; macOS GUI apps do not inherit the shell PATH, so we add critical
+;; directories explicitly. Order matches the shell's $PATH priority.
+(let ((extra-paths '("/opt/local/bin"          ; MacPorts
+                     "/opt/local/sbin"          ; MacPorts sbin
+                     "/opt/homebrew/bin"        ; Homebrew (mu, msmtp, …)
+                     "/opt/homebrew/sbin"       ; Homebrew sbin
+                     "/usr/local/bin"           ; local wrappers (emacs script, …)
+                     "/Library/TeX/texbin")))   ; MacTeX
+  (dolist (p (reverse extra-paths))
+    (setenv "PATH" (concat p ":" (getenv "PATH")))
+    (add-to-list 'exec-path p)))
 
 ;; macOS clipboard integration via pbcopy/pbpaste (works in terminal Emacs too)
 (defun my/pbcopy (text &optional _push)