fix: depricaded variable gtk naming

home.nix

@@ -254,6 +254,8 @@ in
       "nfu" = "nix flake update";
       "c" = "claude";
       "o" = "opencode";
+      "ow" =
+        "URL=\"https://$(tailscale status --json | jq -r '.Self.DNSName | sub(\"\\.$\"; \"\")')\"; printf 'Open on phone: %s\\n' \"$URL\"; tailscale serve --bg 443 http://127.0.0.1:4096; opencode web --hostname 127.0.0.1 --port 4096";
       ".." = "z ..";
       j = "jj";
       jgf = "jj git fetch";
@@ -576,10 +578,14 @@ in
     ];
   };
 
-  xdg.userDirs.enable = true;
+  xdg.userDirs = {
+    enable = true;
+    setSessionVariables = true;
+  };
 
   gtk = {
     enable = true;
+    gtk4.theme = config.gtk.theme;
     gtk3.extraConfig.gtk-application-prefer-dark-theme = 1;
   };