created custom vscode extension

configurations/home-manager/leyla/packages/vscode/default.nix

@@ -99,6 +99,11 @@ in {
                   ++ (lib.lists.optionals ai-tooling-enabled [
                     ])
               )
+              ++ (
+                with pkgs.codium-extensions; [
+                  ai-code
+                ]
+              )
           );
         };
       };