Came back six days later to ship this and the globe rendered behind a giant red error. Cannot find module 'tailwindcss'. The automated cleanup had added Tailwind to package.json but the module never actually landed in node_modules. Classic AI Studio export problem: the manifest says one thing, the filesystem says another. The app only uses Tailwind on five elements — flex flex-col items-center justify-center min-h-screen and a handful of text utilities. Judgment call: install it properly or rewrite five classNames in vanilla CSS? The postcss config and tailwind config were already wired up, so npm install was the faster path. Clean install, dev server boots, globe spins, toggle works, no errors. Sometimes the fix is just running the command nobody ran.