dig on iPad Shows internal_send Error on socket.c

### Checklist

- [x] Using latest version on the [App Store](http://itunes.apple.com/app/id1156707581)
- [x] Read the [docs](http://blink.sh/docs/)
- [x] Searched for [existing GitHub issues](https://github.com/blinksh/blink/issues)

### Configuration

* Blink 18.6.2.2008
* iPadOS 26.5

### Describe the bug

I am getting the following error when running `dig`. This is on version 18.6.2.2008 running under iPadOS 26.5. The same Blink version on iOS 26.5 does not produce this error.

```
blink> dig www.google.com
/Users/runner/work/network_ios/network_ios/sources/bind9/lib/isc/unix/socket.c:1923: internal_send: fe80::ac62:f9ff:fe52:f
762%65536#53: Invalid argument
```

Start by reproducing `dig www.google.com` on iPadOS 26.5 and comparing it with the same Blink version on iOS. Inspect the reported BIND9 path, `sources/bind9/lib/isc/unix/socket.c:1923`, and the IPv6 address and interface scope in the error. Done means `dig` completes without the `internal_send` Invalid argument error on iPadOS.

Written by the indexing model from the issue text.