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/plugins/screen-recorder.nix

@@ -0,0 +1,15 @@
+_: {
+  programs.noctalia.settings.plugin_settings."noctalia/screen_recorder" = {
+    audio_codec = "flac";
+    audio_source = "both";
+    color_range = "full";
+    hide_inactive = true;
+    quality = "ultra";
+    replay_duration = 60;
+    replay_enabled = true;
+    replay_storage = "disk";
+    resolution = "1920x1080";
+    video_codec = "hevc";
+    video_source = "focused";
+  };
+}