How to test
1. Upload wopmojishop.html AND test-pack.wmoji
to the same directory on your HTTPS server.
2. Open https://<your-host>/wopmojishop.html on a
device running WopWap.
3. Tap Install in WopWap. Or copy the deeplink and paste
it into WopMoji → Shop → Paste install link.
4. The download manager fetches test-pack.wmoji,
verifies its BLAKE3 hash, and adds the pack to your gallery.