gaming: install Minecraft Bedrock via nix-flatpak

Add the nix-flatpak flake input and wire its NixOS module into the gaming
module to declaratively install io.mrarm.mcpelauncher from Flathub. The
Flatpak build tracks the newer, pairip-protected Bedrock releases ahead of
the nixpkgs mcpelauncher package.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

flake.lock

@@ -137,6 +137,21 @@
         "type": "github"
       }
     },
+    "nix-flatpak": {
+      "locked": {
+        "lastModified": 1783368811,
+        "narHash": "sha256-0H8jDwR4Kegb3heaTrH1ftbgKfZVDT8JE+46uXxDy/Q=",
+        "owner": "gmodena",
+        "repo": "nix-flatpak",
+        "rev": "20d42f0ee98c9fe9f85e8d1de474f1409ed10d05",
+        "type": "github"
+      },
+      "original": {
+        "owner": "gmodena",
+        "repo": "nix-flatpak",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1784796856,
@@ -203,6 +218,7 @@
         "home-manager": "home-manager",
         "hyprland-preview-share-picker": "hyprland-preview-share-picker",
         "illogical-flake": "illogical-flake",
+        "nix-flatpak": "nix-flatpak",
         "nixpkgs": "nixpkgs",
         "spicetify-nix": "spicetify-nix"
       }

flake.nix

@@ -48,6 +48,11 @@
       url = "github:Gerg-L/spicetify-nix";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+
+    # Declarative Flatpak app/remote management (extends services.flatpak). Used
+    # for the Minecraft Bedrock launcher, whose Flatpak build tracks newer,
+    # pairip-protected Bedrock releases ahead of the nixpkgs package.
+    nix-flatpak.url = "github:gmodena/nix-flatpak";
   };
 
   outputs = { nixpkgs, home-manager, ... }@inputs: {

modules/gaming.nix

@@ -1,6 +1,8 @@
-{ pkgs, ... }:
+{ inputs, pkgs, ... }:
 
 {
+  imports = [ inputs.nix-flatpak.nixosModules.nix-flatpak ];
+
   programs.steam = {
     enable = true;
     remotePlay.openFirewall = true;
@@ -17,4 +19,14 @@
     prismlauncher
     protonup-qt
   ];
+
+  # Minecraft Bedrock via mcpelauncher (unofficial; runs the Android ARM build
+  # through a libc shim — you must own Bedrock on Google Play). Installed as a
+  # Flatpak (io.mrarm.mcpelauncher) rather than the nixpkgs package, whose
+  # launcher lagged the newer, pairip-protected Bedrock releases. nix-flatpak
+  # adds the Flathub remote (its default) and installs the app on activation.
+  services.flatpak = {
+    enable = true;
+    packages = [ "io.mrarm.mcpelauncher" ];
+  };
 }