install chatgpt app

Author: ngalaiko

hosts/macbook/homebrew.nix

@@ -35,6 +35,7 @@
 
     casks = [
       "calibre"
+      "chatgpt" # OpenAI's desktop app; hosts Codex since the standalone Codex app was discontinued (2026-07)
       "daisydisk"
       "discord"
       "firefox"