# PWA installability - required for Install (not just Add to Home Screen) on Android
# Manifest MUST be served with application/manifest+json - Chrome rejects otherwise
location = /manifest.webmanifest {
    default_type application/manifest+json;
    add_header Cache-Control "public, max-age=0, must-revalidate";
}
# Service worker - no cache so updates apply
location ~ ^/(sw\.js|workbox-.*\.js|registerSW\.js)$ {
    add_header Content-Type application/javascript;
    add_header Service-Worker-Allowed /;
    add_header Cache-Control "no-cache, no-store, must-revalidate";
}
# index.html - avoid aggressive cache for PWA updates
location = /index.html {
    add_header Cache-Control "public, max-age=0, must-revalidate";
}