zsh: remove vteIntegration from rescue image

hosts/by-name/rescue/default.nix

@@ -9,6 +9,7 @@
   sane.image.extraBootFiles = [ pkgs.bootpart-uefi-x86_64 ];
   # sane.persist.enable = false;  # TODO: disable (but run `nix flake check` to ensure it works!)
   sane.nixcache.enable = false;  # don't want to be calling out to dead machines that we're *trying* to rescue
+  sane.zsh.guiIntegrations = false;  # save on unused dependencies
 
   # docs: https://nixos.org/manual/nixos/stable/options.html#opt-system.stateVersion
   system.stateVersion = "21.05";

hosts/common/programs/zsh/default.nix

@@ -27,6 +27,7 @@ in
     ./starship.nix
   ];
   options = {
+    # TODO: port to sane.programs options
     sane.zsh = {
       showDeadlines = mkOption {
         type = types.bool;
@@ -38,6 +39,14 @@ in
         default = true;
         description = "enable starship prompt";
       };
+      guiIntegrations = mkOption {
+        type = types.bool;
+        default = true;
+        description = ''
+          integrate with things like VTE, so that windowing systems can show the PWD in the title.
+          drags in gtk+3.
+        '';
+      };
     };
   };
 
@@ -145,7 +154,7 @@ in
         '';
 
         syntaxHighlighting.enable = true;
-        vteIntegration = true;
+        vteIntegration = cfg.guiIntegrations;
       };
 
       # enable a command-not-found hook to show nix packages that might provide the binary typed.