big refactor by claude

nvidia.nix

@@ -0,0 +1,24 @@
+{ ... }:
+
+{
+  services.xserver.videoDrivers = [ "nvidia" ];
+
+  hardware = {
+    nvidia = {
+      modesetting.enable = true;
+      powerManagement.enable = true;
+      open = false;
+      nvidiaSettings = true;
+    };
+    graphics = {
+      enable = true;
+      enable32Bit = true;
+    };
+  };
+
+  environment.sessionVariables = {
+    LIBVA_DRIVER_NAME          = "nvidia";
+    __GLX_VENDOR_LIBRARY_NAME  = "nvidia";
+    NVD_BACKEND                = "direct";
+  };
+}