Android: roughly one call in three fails with "snapshot helper could not confirm release of device automation ownership"

## What happened

agent-device 0.21.1, Android emulator (API 35 AVD created by an external tool), several sessions on different emulators on the same host. Over a 100-minute run about one call in three, across `snapshot`, `press` and `type`, failed with:

```
Android snapshot helper could not confirm release of device automation ownership
```

A retry after about five seconds succeeded every time. Two other runs on the same host saw the same failure twice each. Worse than the failure itself: a `press --settle` that hit it sometimes drove stale coordinates on the next attempt (one confirm-dialog tap landed on the wrong element).

## Proposal

Retry the ownership handshake internally with a short backoff before surfacing the error, and never reuse a pre-failure snapshot for coordinates after it.