feat(nix): add HALO system configuration and user setup

- Added system configuration for the HALO machine, including hardware, sound, and remapping settings.
- Configured user-specific settings like session paths, favorite apps, and terminal customization.
- Introduced zram swap, SSD TRIM, and PipeWire priority tuning for performance optimization.

homes/x86_64-linux/harald@halo/default.nix

@@ -0,0 +1,88 @@
+{ config, ... }:
+{
+  home.sessionPath = [
+    "$HOME/bin"
+    "$HOME/.local/share/JetBrains/Toolbox/scripts"
+  ];
+
+  metacfg = {
+    user = {
+      enable = true;
+      name = config.snowfallorg.user.name;
+    };
+    cli-apps = {
+      bash.enable = true;
+      fish.enable = true;
+      neovim.enable = false;
+      bat.enable = true;
+      starship.enable = true;
+      home-manager.enable = true;
+    };
+    tools = {
+      git.enable = true;
+    };
+    gui.kbd.ellipsis = true;
+  };
+
+  fonts.fontconfig.enable = true;
+
+  services.syncthing = {
+    enable = true;
+    tray.enable = true;
+  };
+
+  dconf.settings = {
+    # ...
+    "org/gnome/shell" = {
+      disable-user-extensions = false;
+
+      # `gnome-extensions list` for a list
+      enabled-extensions = [
+        "Vitals@CoreCoding.com"
+        "appindicatorsupport@rgcjonas.gmail.com"
+        "dash-to-panel@jderose9.github.com"
+        "hibernate-status@dromi"
+        "autohide-battery@sitnik.ru"
+        "clipboard-history@alexsaveau.dev"
+      ];
+
+      # dconf watch /
+      favorite-apps = [
+        "org.wezfurlong.wezterm.desktop"
+        "jetbrains-toolbox.desktop"
+        "org.mozilla.firefox.desktop"
+        "firefox.desktop"
+        "thunderbird.desktop"
+        "org.mozilla.Thunderbird.desktop"
+        "slack.desktop"
+        "keybase.desktop"
+        "cider-2.desktop"
+        "org.gnome.Nautilus.desktop"
+        "virt-manager.desktop"
+      ];
+    };
+    "org/virt-manager/virt-manager/connections" = {
+      autoconnect = [ "qemu:///system" ];
+      uris = [ "qemu:///system" ];
+    };
+  };
+
+  dconf.settings."org/gnome/desktop/input-sources".xkb-options = [ "mod:ellipsis" ];
+
+  xdg.enable = true;
+  xdg.mime.enable = true;
+
+  xdg.configFile."wezterm/wezterm.lua".text = ''
+    local wezterm = require("wezterm")
+    local config = wezterm.config_builder()
+    local act = wezterm.action
+
+    config.enable_kitty_keyboard = true
+    config.enable_scroll_bar = true
+    config.window_background_image = '${./terminal-background.png}'
+
+    config.term = 'wezterm'
+
+    return config
+  '';
+}