Rename noctalia-shell to noctalia and add support

* Rename `nooctalia-plugins` to `noctalia-plugins` in host modules and
  plugin definitions
* Update Hyprland keybindings and exec-once to use the new `noctalia`
  commands
* Add `stylixImage` option and enable pointer cursor in
  `modules/core/user.nix`
* Introduce `modules/home/nixpkgs.nix` to allow unfree packages and
  insecure Electron
* Add full Noctalia configuration module with settings for audio,
  bar, calendar, location, notifications, plugins, shell, wallpaper,
  and widgets
* Enable `noctalia` in `modules/home/stylix.nix` and replace legacy
  `noctalia-shell` imports in `modules/home/default.nix`

modules/home/noctalia/settings/widget.nix

@@ -0,0 +1,50 @@
+{username, ...}: {
+  programs.noctalia.settings.widget = {
+    battery.display_mode = "graphic";
+
+    bluetooth.hide_when_no_connected_device = true;
+
+    clock.format = "{:%H:%M:%S}";
+
+    control-center = {
+      custom_image = "/home/${username}/garandos/GarandOS.svg";
+      scale = 1.3;
+    };
+
+    cpu.display = "text";
+
+    launcher.glyph = "rocket";
+
+    media.title_scroll = "on_hover";
+
+    network.show_label = false;
+
+    network_rx = {
+      display = "text";
+      network_speed_compact = true;
+    };
+
+    network_tx = {
+      display = "text";
+      network_speed_compact = true;
+    };
+
+    ram.display = "text";
+
+    recorder.type = "noctalia/screen_recorder:recorder";
+
+    spacer_2.type = "spacer";
+
+    spacer_3.type = "spacer";
+
+    sysmon = {
+      display = "text";
+      path = "/home";
+      stat = "disk_pct";
+    };
+
+    tray.hidden = ["nm-applet" "Easy Effects"];
+
+    workspaces.scale = 1.1;
+  };
+}