chore: upgrade to nixpkgs/nix-darwin/home-manager 25.05

Update all flake inputs from 24.11 to 25.05 and address breaking changes:
- nix-darwin: Replace services.nix-daemon.enable with nix.enable
- nix-darwin: Add system.primaryUser for new user management
- nixpkgs: Update nerd-fonts syntax (nerdfonts.override → nerd-fonts.*)
- nixpkgs: Fix package rename (darwin.iproute2mac → iproute2mac)
- home-manager: Replace deprecated initExtra with initContent
- nix-darwin: Remove deprecated configureBuildUsers option
- overlays: Fix allowUnfree configuration for unstable packages

Author: refnode

flake.lock

@@ -2,11 +2,11 @@
   description = "refnode's Nix configurations";
 
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/nixos-24.11";
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-25.05";
     nixpkgs-unstable.url = "github:nixos/nixpkgs/nixos-unstable";
-    nix-darwin.url = "github:lnl7/nix-darwin/nix-darwin-24.11";
+    nix-darwin.url = "github:lnl7/nix-darwin/nix-darwin-25.05";
     nix-darwin.inputs.nixpkgs.follows = "nixpkgs";
-    home-manager.url = "github:nix-community/home-manager/release-24.11";
+    home-manager.url = "github:nix-community/home-manager/release-25.05";
     home-manager.inputs.nixpkgs.follows = "nixpkgs";
     pre-commit-hooks.url = "github:cachix/git-hooks.nix";
     pre-commit-hooks.inputs.nixpkgs.follows = "nixpkgs";

flake.nix

@@ -1,12 +1,8 @@
 {pkgs, ...}: {
   fonts = {
     packages = [
-      (pkgs.nerdfonts.override {
-        fonts = [
-          "JetBrainsMono"
-          "Meslo"
-        ];
-      })
+      pkgs.nerd-fonts.jetbrains-mono
+      pkgs.nerd-fonts.meslo-lg
     ];
   };
 }

hosts/common/core/fonts.nix

@@ -2,7 +2,6 @@
   nix = {
     # package = pkgs.nixVersions.nix_2_16;
     checkConfig = true;
-    configureBuildUsers = true;
     settings = {
       # Necessary for using flakes on this system.
       experimental-features = [
@@ -28,6 +27,6 @@
     };
   };
 
-  # Auto upgrade nix package and the daemon service.
-  services.nix-daemon.enable = true;
+  # nix-darwin manages nix-daemon unconditionally when
+  nix.enable = true;
 }

hosts/common/core/nix.nix

@@ -22,4 +22,6 @@
   };
 
   environment.systemPath = ["/opt/homebrew/bin"];
+
+  system.primaryUser = "refnode";
 }

hosts/common/darwin/core/default.nix

@@ -5,7 +5,7 @@
     unstable = import nixpkgs-unstable {
       system = final.system;
       # activate unfree when I know that I need it.
-      config.allowUnfree = false;
+      config.allowUnfree = true;
     };
   };
 }

overlays/default.nix

@@ -29,7 +29,7 @@
     autosuggestion.enable = true;
     autosuggestion.highlight = "fg=#d8dee9,bg=#4c566a";
 
-    initExtra = builtins.readFile ./zsh.sh;
+    initContent = builtins.readFile ./zsh.sh;
   };
 
   # enable the fzf zsh integration by default history, file and directory

users/refnode/common/core/zsh/default.nix

@@ -5,6 +5,6 @@
   ...
 }: {
   home.packages = with pkgs; [
-    darwin.iproute2mac
+    iproute2mac
   ];
 }