xmobar: bring libnotify into scope

nix/configurations/vanadium/home/xmobar.nix

@@ -2,13 +2,17 @@
   home.packages = let
     inherit (pkgs) lib;
 
+    ghc = pkgs.haskellPackages.ghc.withPackages (haskellPackages: [
+      haskellPackages.xmobar
+    ]);
+
     wrapped-xmobar = pkgs.symlinkJoin {
       name = "xmobar";
       paths = [pkgs.xmobar];
       buildInputs = [pkgs.makeWrapper];
       postBuild = ''
         wrapProgram $out/bin/xmobar \
-          --prefix PATH : "${lib.makeBinPath [pkgs.ghc]}"
+          --prefix PATH : "${lib.makeBinPath [ghc pkgs.libnotify]}"
       '';
     };
   in [
@@ -19,6 +23,8 @@
     "xmobar" = {
       # Xmobar uses the directory to compile too,
       # Linking the entire folder directly would make the directory not writable
+      #
+      # We need to clean up the xmobar executable so it recompiles
       recursive = true;
       source = "${./xmobar}";
     };