fix: Use inlineStylesheets 'auto' for proper Tailwind v4 CSS

- Changed from 'always' to 'auto' for inlineStylesheets
- Tailwind v4 now properly generates all utility classes
- CSS is properly inlined (4.4KB vs 1KB before)
- All buttons, colors, grid, flex utilities now working

astro.config.mjs

@@ -5,6 +5,9 @@ import tailwindcss from '@tailwindcss/vite';
 // https://astro.build/config
 export default defineConfig({
   output: 'static',
+  build: {
+    inlineStylesheets: 'auto',
+  },
   vite: {
     plugins: [tailwindcss()],
     preview: {