feat(konishi): flatpak for PrusaSlicer 3.0 alpha

Prusa ships no Linux binary as of 3.0 — the GitHub release has only
.dmg and .zip, and Flathub is now the sole Linux channel, with alphas
in flathub-beta.

nixpkgs' services.flatpak only exposes `enable`, so this pulls in
nix-flatpak for declarative remotes and packages.

Co-Authored-By: Claude <noreply@anthropic.com>

flake.lock

@@ -767,6 +767,22 @@
         "url": "https://git.naps.pt/naps62/maestro.git"
       }
     },
+    "nix-flatpak": {
+      "locked": {
+        "lastModified": 1767983141,
+        "narHash": "sha256-7ZCulYUD9RmJIDULTRkGLSW1faMpDlPKcbWJLYHoXcs=",
+        "owner": "gmodena",
+        "repo": "nix-flatpak",
+        "rev": "440818969ac2cbd77bfe025e884d0aa528991374",
+        "type": "github"
+      },
+      "original": {
+        "owner": "gmodena",
+        "ref": "latest",
+        "repo": "nix-flatpak",
+        "type": "github"
+      }
+    },
     "nix-index-database": {
       "inputs": {
         "nixpkgs": [
@@ -1085,6 +1101,7 @@
         "home-manager": "home-manager",
         "hyprland": "hyprland",
         "maestro": "maestro",
+        "nix-flatpak": "nix-flatpak",
         "nix-index-database": "nix-index-database",
         "nixpkgs": "nixpkgs_7",
         "nvchad-starter": "nvchad-starter",

flake.nix

@@ -80,6 +80,9 @@
       url = "git+https://git.naps.pt/yolo/rev.git";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+    # Declarative flatpak remotes and packages; nixpkgs' services.flatpak only
+    # exposes `enable`. Has no nixpkgs input to follow.
+    nix-flatpak.url = "github:gmodena/nix-flatpak/?ref=latest";
     nix-index-database = {
       url = "github:nix-community/nix-index-database";
       inputs.nixpkgs.follows = "nixpkgs";

hosts/common/features/flatpak.nix

@@ -0,0 +1,28 @@
+{ inputs, lib, ... }:
+{
+  imports = [ inputs.nix-flatpak.nixosModules.nix-flatpak ];
+
+  services.flatpak = {
+    enable = true;
+
+    # mkOptionDefault so the module's default `flathub` remote is kept rather
+    # than replaced.
+    remotes = lib.mkOptionDefault [
+      {
+        name = "flathub-beta";
+        location = "https://flathub.org/beta-repo/flathub-beta.flatpakrepo";
+      }
+    ];
+
+    packages = [
+      # PrusaSlicer 3.x. As of 3.0 Prusa ships no Linux binary at all — Flathub
+      # is the only channel, and the alphas live in flathub-beta. Runs alongside
+      # pkgs.prusa-slicer (2.9.x, in home/common/programs/3d.nix): 3.x keeps its
+      # profiles in a separate PrusaSlicer3-dev config dir.
+      {
+        appId = "com.prusa3d.PrusaSlicer";
+        origin = "flathub-beta";
+      }
+    ];
+  };
+}

hosts/konishi/default.nix

@@ -20,6 +20,7 @@
     ../common/features/wine.nix
     ../common/features/gaming
     ../common/features/appimage.nix
+    ../common/features/flatpak.nix
     ../common/features/smb-mounts.nix
     ../common/features/home
   ];