gaming improvements

- switched to cachyos-bore kernel from mainline lts kernel
- pinned mesa version at 25 to fix issues with minecraft shaders
- switched steam to use the flatpak, since native steam wouldn't launch with the downgraded mesa version

flake.nix

@@ -3,11 +3,15 @@
 
   inputs = {
     nixpkgs = {
-      url = "github:nixos/nixpkgs/nixos-26.05";
+      url = "github:nixos/nixpkgs/nixos-unstable";
+    };
+
+    nixpkgs-mesa-overlay = {
+      url = "github:nixos/nixpkgs/e4f9df8a27c2b4871c665368e65bdb6852dd93e6";
     };
 
     home-manager = {
-      url = "github:nix-community/home-manager/release-26.05";
+      url = "github:nix-community/home-manager";
       inputs.nixpkgs.follows = "nixpkgs";
     };
 
@@ -17,7 +21,7 @@
     };
 
     stylix = {
-      url = "github:nix-community/stylix/release-26.05";
+      url = "github:nix-community/stylix";
       inputs.nixpkgs.follows = "nixpkgs";
     };
 
@@ -48,13 +52,19 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
 
-    nixos-millennium = {
+    /*nixos-millennium = {
       url = "git+https://git.greyweather.dev/greyweather/nixos-millennium";
       inputs.nixpkgs.follows = "nixpkgs";
+    };*/
+
+    nix-cachyos-kernel = {
+      url = "github:xddxdd/nix-cachyos-kernel/release";
     };
   };
 
-  outputs = {self,nixpkgs,home-manager,plasma-manager,stylix,...}@inputs: {
+  outputs = {self,nixpkgs,nixpkgs-mesa-overlay,home-manager,plasma-manager,stylix,...}@inputs: let
+    system = "x86_64-linux";
+  in {
     nixosConfigurations = builtins.listToAttrs (map (name: {
       inherit name;
       value = nixpkgs.lib.nixosSystem {
@@ -76,9 +86,13 @@
         ];
         specialArgs = {
           inherit inputs;
+          inherit system;
           hostname = name;
-          system = "x86-64-linux";
           stateVersion = "26.05";
+          pkgs-mesa-overlay = import nixpkgs-mesa-overlay {
+            inherit system;
+            config.allowUnfree = true;
+          };
         };
       };
     }) ["takamaki" "kitagawa" "nixos-vm"]);