Add NetworkFirst caching strategy for navigation requests

This enables offline navigation by caching HTML documents generated by SSR.
When offline, users can now navigate to cached pages using the service worker.

nuxt4/nuxt.config.ts

@@ -79,6 +79,18 @@ export default defineNuxtConfig({
         {
           urlPattern: /^https:\/\/authentik\.nucleoriofrio\.com\/.*/i,
           handler: 'NetworkOnly'
+        },
+        {
+          urlPattern: ({ request }) => request.mode === 'navigate',
+          handler: 'NetworkFirst',
+          options: {
+            cacheName: 'pages-cache',
+            networkTimeoutSeconds: 3,
+            expiration: {
+              maxEntries: 10,
+              maxAgeSeconds: 60 * 60 * 24 // 24 hours
+            }
+          }
         }
       ]
     },