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Zoltan Papp d15830a2d0 [client] Sync 0.74.6 fix/ios-relogin (#6795)
## sync 0.74.6 fix/ios-relogin

NewAuth built a fresh in-memory config on every call via
CreateInMemoryConfig, which generates a new WireGuard private key when
none is set. The iOS Swift layer calls this on interactive re-login and
writes the resulting config back to the profile's netbird.cfg, so each
re-auth replaced the peer's persisted private key with a new one. A new
key means a new public key, so the management server registered a
brand-new peer on every re-authentication — named after the fallback
hostname.

Load the existing config with DirectUpdateOrCreateConfig when a config
file is already present so re-login reuses the peer's persisted private
key (and its identity). Only fall back to a fresh in-memory config for
the first-time login when no config file exists yet (or after logout,
which deletes the file). DirectUpdateOrCreateConfig uses non-atomic
writes so it also works inside the tvOS App Group sandbox. This matches
what Run() and LoginForMobile() already do.

## Describe your changes

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### Checklist
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- [ ] Is a typo/documentation fix
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functionality behavior, CLI / service flags, or introduce a new feature
— **OR** I have discussed it with the NetBird team beforehand (link the
issue / Slack thread in the description). See

[CONTRIBUTING.md](https://github.com/netbirdio/netbird/blob/main/CONTRIBUTING.md#discuss-changes-with-the-netbird-team-first).

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<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Bug Fixes**
- Improved iOS login handling when a configuration location is provided.
- Existing WireGuard keys can now be reused across subsequent logins,
helping avoid unnecessary key regeneration.
- Login continues to support temporary in-memory configuration when no
persistent location is available.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->
2026-07-16 14:38:01 +02:00
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