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sw.js

Service worker minimal : précache le shell et sert cache-first.

const CACHE = 'app-v1';
const ASSETS = ['/', '/index.html', '/styles.css', '/app.js'];

self.addEventListener('install', (e) => {
  e.waitUntil(caches.open(CACHE).then((c) => c.addAll(ASSETS)));
});

self.addEventListener('fetch', (e) => {
  e.respondWith(caches.match(e.request).then((hit) => hit || fetch(e.request)));
});