feat: add a Notes desktop entry

Open the existing notebook in terminal Neovim without creating a daily note.

modules/capabilities/notes.nix

@@ -50,6 +50,14 @@ in
     {
       home.packages = [
         openDailyNote
+        (pkgs.makeDesktopItem {
+          name = "notes";
+          desktopName = "Notes";
+          icon = "text-editor";
+          exec = "nvim .";
+          path = "${home}/sync/notes";
+          terminal = true;
+        })
         pkgs.ripgrep-all
         pkgs.zk
       ];