The web push payload sends the URL in data.url but the service
worker was looking for data.path, resulting in undefined URLs.
Also fix WebPush::Notification test to use url instead of path
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
The `ipaddr` arg here is being interpreted as a positional arg (since
the keyword arg doesn't exist), which results in an invalid connection
object. This was causing push notifications to silently fail.
We should initialise the property on the object instead.
We are not trying to handle user input so `cast` can be a no-op. Also
extract the base36 normalization logic, let the binary class handle the
serialize encoding and add some tests.
Rosa Gutierrez