Update to emacs 30.

nix/configuration/roles/emacs/default.nix

@@ -89,7 +89,7 @@ in
       (lib.mkIf (config.me.graphical) {
         nixpkgs.overlays = [
           (final: prev: {
-            my_emacs = final.emacs29-pgtk;
+            my_emacs = final.emacs30-pgtk;
           })
         ];
       })
@@ -121,6 +121,7 @@ in
                       dicts: with dicts; [
                         en
                         en-computers
+                        # en-science # TODO: Why is en-science non-free?
                       ]
                     ))
                     final.nixd # nix language server

nix/configuration/roles/emacs/files/emacs/elisp/base-extensions.el

@@ -56,6 +56,7 @@
   (savehist-mode))
 
 (use-package which-key
+  :pin gnu
   :diminish
   :config
   (which-key-mode))

nix/configuration/roles/emacs/files/emacs/elisp/base.el

@@ -63,6 +63,9 @@
  show-trailing-whitespace t
  ;; Remove the line when killing it with ctrl-k
  kill-whole-line t
+
+ ;; Show the current project in the mode line
+ project-mode-line t
  )
 
 ;; (setq-default fringes-outside-margins t)