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The captive-portal Step-2 QR opens pictureframe.edholm.me in Safari, which is the perfect moment to also offer "pin this to your home screen" so the recipient gets one-tap access without typing the URL again. Two pieces: * Service worker at /sw.js (document root, scope "/"). Minimal — install/activate calls skipWaiting + clients.claim, fetch is passthrough. Real offline caching is intentionally out of scope; we only need the SW to exist so Chrome's PWA-install heuristic fires. * Settings → Install app section, hidden when display-mode standalone. Android Chrome path: native beforeinstallprompt button. iOS Safari (and any other non-prompt browser): button opens a modal with step-by-step Share → Add to Home Screen instructions. usePwaInstall composable handles the singleton lifecycle — beforeinstallprompt fires once per page load and may fire before the user navigates to Settings, so we register on module import and stash the event for later. Tests cover: install button rendered when not standalone, modal opens on click without a native prompt, modal close button works. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>