Fix deprecated Nix system access

flake.nix

@@ -94,7 +94,7 @@
             enable = lib.mkEnableOption "Rats with Gats remote play service";
             package = lib.mkOption {
               type = lib.types.package;
-              default = self.packages.${pkgs.system}.default;
+              default = self.packages.${pkgs.stdenv.hostPlatform.system}.default;
               description = "The pirats package to use.";
             };
             host = lib.mkOption {

frontend/src/lib/changelog.js

@@ -6,7 +6,7 @@
 //   - Add a CHANGELOG entry only when a commit changes something players can
 //     see. Skip refactors, tests, and tooling. Keep wording player-facing.
 
-export const VERSION = 25;
+export const VERSION = 26;
 
 // Newest first. Each entry: { version, date: 'YYYY-MM-DD', changes: [string, ...] }.
 export const CHANGELOG = [