feat(desktop): setup river window manager.

hosts/ymir/configuration.nix

@@ -104,6 +104,11 @@
   # Enable light for image control
   programs.light.enable = true;
 
+  programs.river = {
+    enable = true;
+    extraPackages = [];
+  };
+
   # Define a user account. Don't forget to set a password with ‘passwd’.
   users.users.crony = {
     isNormalUser = true;

hosts/ymir/home.nix

@@ -30,6 +30,7 @@
   crony.gaming.enable = true;
   crony.flatpak.enable = true;
   crony.wayland.enable = true;
+  crony.river.enable = true;
 
   # DO NOT CHANGE ALSO
   home.stateVersion = "24.11"; # Please read the comment before changing.