waybar: use catppuccin module, add GTK theme

Switch waybar from manual fetchFromGitHub theme to catppuccin/nix module.
Add catppuccin macchiato GTK theme to fix unreadable tray context menus.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

home/hyprland/cursor.nix

@@ -9,5 +9,4 @@
     size = 32;
   };
 
-  gtk.enable = true;
 }