sm new scaffold ships no Tailwind config — every page renders unstyled

[antosubash]

Fixed in #87 — the sm new scaffold now ships:

1. tailwindcss@^4 + @tailwindcss/vite@^4 in client_app/package.json devDependencies
2. tailwindcss() registered in the default vite.config.ts plugins
3. client_app/styles.css that imports @simple-module-py/ui/styles/globals.css, imports modules.generated.css, and includes @source directives for module pages

Verified in framework/cli/simple_module_cli/templates/host/client_app/.