The browser fires beforeinstallprompt very early (~1s after page load),
before Svelte's $effects run. Moving the event listener registration to
module level ensures we never miss the event regardless of when init()
is called from the root layout.
init() now only handles dismiss state (localStorage) and standalone
detection (DOM) — both safe to defer until after component mount.
Platforms:
- Chrome / Chromium / Android: native install button via captured prompt
- iOS Safari: manual Share → Add to Home Screen instructions (unchanged)
- Firefox desktop: no beforeinstallprompt support (browser-level limitation);
Firefox shows its own install button in the address bar automatically
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
