feat: minimal pwa

public/sw.js

@@ -0,0 +1,82 @@
+const CACHE_NAME = 'linkding-v1';
+const urlsToCache = [
+  '/',
+  '/index.html',
+  '/styles.css',
+  '/app.js',
+  '/manifest.json',
+  '/icon-192.png',
+  '/icon-512.png'
+];
+
+// Install event - cache resources
+self.addEventListener('install', (event) => {
+  event.waitUntil(
+    caches.open(CACHE_NAME)
+      .then((cache) => {
+        console.log('Opened cache');
+        return cache.addAll(urlsToCache);
+      })
+      .catch((error) => {
+        console.error('Cache install failed:', error);
+      })
+  );
+  self.skipWaiting();
+});
+
+// Activate event - clean up old caches
+self.addEventListener('activate', (event) => {
+  event.waitUntil(
+    caches.keys().then((cacheNames) => {
+      return Promise.all(
+        cacheNames.map((cacheName) => {
+          if (cacheName !== CACHE_NAME) {
+            console.log('Deleting old cache:', cacheName);
+            return caches.delete(cacheName);
+          }
+        })
+      );
+    })
+  );
+  return self.clients.claim();
+});
+
+// Fetch event - serve from cache, fallback to network
+self.addEventListener('fetch', (event) => {
+  // API requests - always fetch from network, don't cache
+  if (event.request.url.includes('/api/')) {
+    event.respondWith(fetch(event.request));
+    return;
+  }
+
+  // Static assets - cache first, then network
+  event.respondWith(
+    caches.match(event.request)
+      .then((response) => {
+        // Return cached version or fetch from network
+        return response || fetch(event.request).then((response) => {
+          // Don't cache non-successful responses
+          if (!response || response.status !== 200 || response.type !== 'basic') {
+            return response;
+          }
+
+          // Clone the response
+          const responseToCache = response.clone();
+
+          caches.open(CACHE_NAME)
+            .then((cache) => {
+              cache.put(event.request, responseToCache);
+            });
+
+          return response;
+        });
+      })
+      .catch(() => {
+        // If both cache and network fail, return offline page if available
+        if (event.request.destination === 'document') {
+          return caches.match('/index.html');
+        }
+      })
+  );
+});
+