global(gui): add niri

Changed files
+5
global
+1
global/gui/default.nix
···
./dm.nix
./wayland.nix
+
./niri.nix
./kde.nix
./fonts.nix
+4
global/gui/niri.nix
···
+
{ lib, config, ... }:
+
lib.mkIf config.gensokyo.traits.gui {
+
programs.niri.enable = true;
+
}