added own caching for ical feed

frontend/vite.config.ts

@@ -85,6 +85,17 @@ export default defineConfig({
         globPatterns: ["**/*.{js,css,html,ico,png,svg,json,vue,txt,woff2}"],
         cleanupOutdatedCaches: true,
         runtimeCaching: [
+          {
+            urlPattern: ({ url }) => url.pathname.startsWith('/api/feed'),
+            method: 'GET',
+            handler: 'NetworkFirst',
+            options: {
+              cacheName: 'calendar-feed-cache',
+              expiration: {
+                maxAgeSeconds: 12 * 60 * 60, // 12 hours
+              },
+            },
+          },
           {
             urlPattern: /^https?.*/,
             handler: "NetworkFirst",