perf: async-load Google Fonts to unblock rendering

Replace blocking stylesheet link with preload + onload swap.
Page renders immediately with system font fallback, swaps to
Inter/JetBrains Mono once loaded. Saves ~800ms on mobile FCP.

Author: caiopizzol

apps/web/index.html

@@ -72,9 +72,11 @@
   <link rel="apple-touch-icon" sizes="180x180" href="/public/apple-touch-icon.png">
   <link rel="preconnect" href="https://fonts.googleapis.com">
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
-  <link
+  <link rel="preload"
     href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap"
-    rel="stylesheet">
+    as="style" onload="this.onload=null;this.rel='stylesheet'">
+  <noscript><link rel="stylesheet"
+    href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap"></noscript>
   <style>
     * {
       margin: 0;