feat: add gaming applications configuration for NixOS

home/programs/steam/system.nix

@@ -1,13 +1,27 @@
-{ ... }: {
-  # Steam runtime tweaks (user-session level, not NixOS system config)
+{
+	pkgs,
+	...
+}: {
 
-  home.sessionVariables = {
-    # Improves scaling consistency on HiDPI / Wayland setups
-    STEAM_FORCE_DESKTOPUI_SCALING = "1.25";
-
-    # Optional Proton-related behavior toggles (safe defaults)
-    PROTON_ENABLE_NVAPI = "1";
-    PROTON_NO_ESYNC = "0";
-    PROTON_NO_FSYNC = "0";
+  hardware.graphics = {
+    enable = true;
+    enable32Bit = true;
   };
+
+  programs.steam = {
+    enable = true;
+    gamescopeSession.enable = true;
+
+    remotePlay.openFirewall = true;
+    localNetworkGameTransfers.openFirewall = true;
+
+    extraCompatPackages = with pkgs; [
+      proton-ge-bin
+    ];
+  };
+
+  programs.gamescope.enable = true;
+  programs.gamemode.enable = true;
+
+  hardware.steam-hardware.enable = true;
 }