Feature: PWA — Add to Homescreen for native app feel

[mholzi]

Feature

Make the player UI a Progressive Web App so players can install it on their homescreen.

Concept

• Add manifest.json with app name, icons, theme color
• Service worker for offline shell caching
• "Add to Homescreen" prompt on mobile browsers
• Fullscreen mode when launched from homescreen
• Beatify icon on phone — instant access next party

Why

• Near-zero effort, huge UX improvement
• Players return faster: tap icon instead of scanning QR again
• Feels like a native app
• Works on iOS and Android

Implementation Ideas

• Create manifest.json in www/:

  {
    "name": "Beatify",
    "short_name": "Beatify",
    "start_url": "/beatify/",
    "display": "standalone",
    "theme_color": "#1a1a2e",
    "background_color": "#1a1a2e",
    "icons": [...]
  }

• Add `" to player.html
• Basic service worker for shell caching
• Generate PWA icons from existing logo

Effort

~2-3h

Labels

enhancement