pijukka e009e615f4 PWA: manifest, icons, service worker ...

- Installable app: manifest, SVG icon plus PNGs (192, 512, maskable 512,
  apple-touch 180), theme color and iOS meta tags.
- Service worker (production builds only): precaches the page and the
  bundles it references on install (Chromium's memory cache bypasses the
  worker on repeat loads), cache-first for hashed assets, network-first
  for the page and config.js so deploys land at once; ignores Vary
  (module scripts carry an Origin header). Uploads, the websocket and
  anything cross-origin are never touched. Checked in a production
  preview: worker controls the page, and the app opens offline.
- Notifications fall back to the service worker where browsers require
  it (Android), which also handles the click.
- `npm run preview` gets the dev proxy, so the installed app can log in
  locally.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2026-09-28 18:31:29 +02:00

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