_headers

# Netlify counterpart of vercel.json's "headers" — keep the two in sync.
/*
  Content-Security-Policy: default-src 'self'; base-uri 'self'; object-src 'none'; frame-ancestors 'none'; img-src 'self' data:; font-src 'self' https://fonts.gstatic.com; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com https://accounts.google.com/gsi/style; script-src 'self' https://accounts.google.com/gsi/client; connect-src 'self' https://accounts.google.com/gsi/ https://fonts.googleapis.com https://fonts.gstatic.com https://*.ingest.sentry.io https://*.ingest.de.sentry.io; frame-src https://accounts.google.com/gsi/; form-action 'self'; worker-src 'self'; manifest-src 'self'
  X-Content-Type-Options: nosniff
  Referrer-Policy: strict-origin-when-cross-origin
  Permissions-Policy: camera=(), microphone=(), geolocation=(), interest-cohort=()
  Strict-Transport-Security: max-age=63072000; includeSubDomains; preload
  X-Frame-Options: DENY

# Never let a CDN cache pin an old service worker or manifest — updates would stall.
/sw.js
  Cache-Control: public, max-age=0, must-revalidate

/manifest.webmanifest
  Cache-Control: public, max-age=0, must-revalidate