feat: pwa functionality

static/sw.js

@@ -0,0 +1,20 @@
+// static/sw.js
+const CACHE_NAME = 'madplaner-install';
+
+self.addEventListener('install', (event) => {
+    self.skipWaiting(); 
+});
+
+self.addEventListener('activate', (event) => {
+    // Clear out any old caches from previous versions
+    event.waitUntil(
+        caches.keys().then((names) => {
+            return Promise.all(names.map(name => caches.delete(name)));
+        })
+    );
+});
+
+// Network-only fetch: No caching, just live data
+self.addEventListener('fetch', (event) => {
+    event.respondWith(fetch(event.request));
+});