// Minimal service worker — present so Chrome's PWA install criteria
// pass and the beforeinstallprompt event fires. Real offline caching
// is intentionally out of scope; we don't pre-cache the SPA shell or
// intercept fetches in any meaningful way.
//
// Lives at /sw.js (document root, not /build/sw.js) so its default
// scope is /, matching the manifest's "scope": "/". Don't move it
// without setting Service-Worker-Allowed: / on the response.

self.addEventListener('install', () => {
  // Activate immediately, don't wait for old tabs to close
  self.skipWaiting()
})

self.addEventListener('activate', (event) => {
  // Take control of all clients (including ones that loaded before
  // this SW activated) so subsequent navigations go through us.
  event.waitUntil(self.clients.claim())
})

self.addEventListener('fetch', () => {
  // Passthrough — we don't call event.respondWith(), so the browser
  // proceeds with its normal network fetch. The handler existing at
  // all is what Chrome's PWA install heuristic looks for.
})