all application options will adapt to environment

when used either with nixos (no home-manager) or home-manager standalone, `features.applications.<name>.enable` options still perform some functionality, rather than assuming a full nixos + home-manager setup like before

modules/global/global.nix

@@ -82,10 +82,9 @@
       powerOnBoot = false;
     };
 
-    home-manager.sharedModules = [
-      ({ config, ... }: {
-        info.isStandalone = false;
-      })
-    ];
+    home-manager.users.grey = lib.mkIf (config.features.nixos.home-manager.enable) {
+      info.isStandalone = lib.mkDefault false;
+      # home.stateVersion = lib.mkDefault config.info.stateVersion;
+    };
   };
 }