Inline all stylesheets to remove render-blocking CSS request

Switches Astro's inlineStylesheets from 'auto' to 'always' so the
shared CSS bundle (~16 KiB) is embedded directly in each page's HTML
instead of loaded as a separate render-blocking <link>. Cuts the
Lighthouse "render-blocking requests" warning down to fonts only and
removes a critical-path network roundtrip on mobile.

Author: HumbleBee14

astro.config.mjs

@@ -123,7 +123,7 @@ export default defineConfig({
   output: 'static',
 
   build: {
-    inlineStylesheets: 'auto',
+    inlineStylesheets: 'always',
   },
 
   vite: {