sw.js

const CACHE_NAME = 'lifeboat-v3';
const ASSETS = [
  './',
  './index.html',
  './style.css',
  './app.js',
  './manifest.json',
  'https://cdn.jsdelivr.net/npm/jszip@3.10.1/dist/jszip.min.js'
];

self.addEventListener('install', event => {
  event.waitUntil(
    caches.open(CACHE_NAME).then(cache => cache.addAll(ASSETS))
  );
  self.skipWaiting();
});

self.addEventListener('activate', event => {
  event.waitUntil(
    caches.keys().then(keys =>
      Promise.all(keys.filter(k => k !== CACHE_NAME).map(k => caches.delete(k)))
    )
  );
  self.clients.claim();
});

self.addEventListener('fetch', event => {
  const url = new URL(event.request.url);

  // Always go to network for API calls (OpenRouter)
  if (url.hostname === 'openrouter.ai') {
    event.respondWith(fetch(event.request));
    return;
  }

  // Cache-first for everything else
  event.respondWith(
    caches.match(event.request).then(cached => cached || fetch(event.request))
  );
});