Revert to catppuccin mocha theme

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

shared/.config/emacs/init.el

@@ -57,10 +57,10 @@
 
 ;;; Theme
 
-(use-package modus-themes
+(use-package catppuccin-theme
-  :ensure nil
   :config
-  (load-theme 'modus-vivendi t))
+  (setq catppuccin-flavor 'mocha)
+  (load-theme 'catppuccin t))
 
 ;;; Discoverability