stylix: phase 1 — add input and target waybar/fuzzel/mako/hyprlock/hyprland

Adds nix-community/stylix on its release-25.11 branch (master references
options that don't exist in 25.11's nixpkgs). autoEnable=false so
matugen keeps owning every app it currently themes; we only opt in to
the five targets matugen doesn't cover.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

settings/stylix.nix

@@ -0,0 +1,40 @@
+{ config, pkgs, lib, inputs, ... }:
+{
+  imports = [ inputs.stylix.nixosModules.stylix ];
+
+  config = lib.mkIf (lib.elem config.networking.hostName [ "FredOS-Gaming" "FredOS-Macbook" ]) {
+    stylix = {
+      enable = true;
+      image = "${inputs.self}/walls/wallpaper.png";
+      polarity = "dark";
+
+      # Phase 1: opt in to specific targets only. Apps currently handled by
+      # matugen (gtk, ghostty, zen, btop, vscodium, vesktop) keep their
+      # matugen-derived colors — autoEnable would clobber them.
+      autoEnable = false;
+
+      cursor = {
+        package = pkgs.adwaita-icon-theme;
+        name = "Adwaita";
+        size = 24;
+      };
+
+      fonts.monospace = {
+        package = pkgs.nerd-fonts.fira-mono;
+        name = "FiraMono Nerd Font";
+      };
+    };
+
+    home-manager.users.fred = {
+      imports = [ inputs.stylix.homeModules.stylix ];
+
+      stylix.targets = {
+        waybar.enable = true;
+        fuzzel.enable = true;
+        mako.enable = true;
+        hyprlock.enable = true;
+        hyprland.enable = true;
+      };
+    };
+  };
+}