treewide: update to NixOS 25.05

hosts/common.nix

@@ -8,7 +8,7 @@
 {
   imports = [
     inputs.agenix.nixosModules.age
-    inputs.home-manager.nixosModule
+    inputs.home-manager.nixosModules.home-manager
     inputs.stylix.nixosModules.stylix
     ../modules/nixos
   ];

hosts/desktop.nix

@@ -11,15 +11,12 @@
 
   nixpkgs = {
     config.allowUnfree = true;
-    overlays = [
-      (import ../overlays/gnome.nix)
-    ];
   };
 
   services.printing.enable = true;
   services.openssh.startWhenNeeded = true;
 
-  hardware.pulseaudio.enable = false;
+  services.pulseaudio.enable = false;
   security.rtkit.enable = true;
   services.pipewire = {
     enable = true;
@@ -56,14 +53,10 @@
   fonts.packages = with pkgs; [
     corefonts
     noto-fonts
-    (nerdfonts.override {
-      fonts = [
-        "BigBlueTerminal"
-        "ComicShannsMono"
-        "Terminus"
-        "UbuntuMono"
-      ];
-    })
+    nerd-fonts.bigblue-terminal
+    nerd-fonts.comic-shanns-mono
+    nerd-fonts.terminess-ttf
+    nerd-fonts.ubuntu-mono
   ];
 
   modules = {