Add adaptive offline agent engine

sw.js

@@ -0,0 +1,36 @@
+const CACHE_NAME = "polymarket-arena-v35";
+const APP_SHELL = ["/", "/index.html", "/personal.html"];
+
+self.addEventListener("install", event => {
+  event.waitUntil(caches.open(CACHE_NAME).then(cache => cache.addAll(APP_SHELL)).then(() => self.skipWaiting()));
+});
+
+self.addEventListener("activate", event => {
+  event.waitUntil(caches.keys()
+    .then(keys => Promise.all(keys.filter(key => key !== CACHE_NAME).map(key => caches.delete(key))))
+    .then(() => self.clients.claim()));
+});
+
+self.addEventListener("fetch", event => {
+  if(event.request.method !== "GET") return;
+  const url = new URL(event.request.url);
+
+  if(event.request.mode === "navigate") {
+    event.respondWith(fetch(event.request)
+      .then(response => {
+        const copy = response.clone();
+        caches.open(CACHE_NAME).then(cache => cache.put(event.request, copy));
+        return response;
+      })
+      .catch(async () => (await caches.match(event.request)) || (await caches.match("/index.html"))));
+    return;
+  }
+
+  if(url.origin === self.location.origin && !url.pathname.startsWith("/api/")) {
+    event.respondWith(caches.match(event.request).then(cached => cached || fetch(event.request).then(response => {
+      const copy = response.clone();
+      caches.open(CACHE_NAME).then(cache => cache.put(event.request, copy));
+      return response;
+    })));
+  }
+});