feat: fix dotfiles configuration and add home-manager

configuration.nix

@@ -0,0 +1,49 @@
+{ ... }:
+
+{
+  # Determinate already manages the Nix daemon, so nix-darwin shouldn't.
+  nix.enable = false;
+
+  nixpkgs.config.allowUnfree = true;
+  nixpkgs.hostPlatform = "aarch64-darwin"; # use x86_64-darwin for Intel CPU
+
+  system.primaryUser = "laptran";
+  users.users.laptran = {
+    home = "/Users/laptran";
+  };
+
+  system.stateVersion = 6;
+  system.defaults = {
+    NSGlobalDomain = {
+      AppleInterfaceStyle = "Dark";
+      KeyRepeat = 2;          # fast key repeat
+      InitialKeyRepeat = 15;  # short delay before repeat
+      _HIHideMenuBar = true;  # auto-hide the menu bar
+      AppleShowAllExtensions = true;
+    };
+    dock.autohide = true;
+    finder.FXPreferredViewStyle = "Nlsv";  # list view by default
+    finder.CreateDesktop = false;          # clean desktop
+    trackpad.Clicking = true;              # tap to click
+  };
+
+  nix-homebrew = {
+    enable = true;
+    user = "laptran";
+    autoMigrate = true; # adopt existing homebrew if already installed
+  };
+
+  homebrew = {
+    enable = true;
+    onActivation.cleanup = "zap";  # remove anything not listed here
+    onActivation.autoUpdate = true;
+    onActivation.extraFlags = [ "--force" ];
+    brews = [
+      "herdr"
+    ];
+    casks = [
+      "wezterm"
+    ];
+  };
+}
+