[client] Remove lazy connection UI toggle

[pappz]

Lazy connections are now opt-out and controlled centrally by NB_LAZY_CONN, MDM policy (lazyConnection), and the management feature flag (#6617). The per-device UI toggle no longer fits this model: after #6617 the daemon stopped persisting the setting and dropped it from GetConfig, so the Wails toggle always read back OFF and its writes did not survive a restart.

Remove the toggle and the orphaned runtime plumbing, matching what main did for the Fyne UI:

• drop the toggle from SettingsNetwork and the lazy i18n keys
• drop LazyConnectionEnabled from the UI settings service and SetConfig request
• drop the runtime-apply block in server.SetConfig
• delete Engine.SetLazyConnEnabled and ConnMgr.SetLocalLazyConn

The proto fields and FullStatus status reporting are left intact.

Describe your changes

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Stack

Checklist

• Is it a bug fix
• Is a typo/documentation fix
• Is a feature enhancement
• It is a refactor
• Created tests that fail without the change (if possible)
• This change does not modify the public API, gRPC protocols, 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.

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Documentation

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• I added/updated documentation for this change
• Documentation is not needed for this change (explain why)

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Paste the PR link from https://github.com/netbirdio/docs here:

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Summary by CodeRabbit

• New Features

  • None.

• Bug Fixes

  • Removed the lazy-connection setting from the app’s network settings, so the interface now skips that option in all supported languages.
  • Changes to this network behavior are no longer applied live from the settings screen; configuration updates now follow the standard save/apply flow.

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✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch remove-lazy-conn-ui-toggle

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Release artifacts

Built for PR head 745410b in workflow run #16461.

Artifact	Link
All release artifacts	Download
Linux packages	Download
Windows packages	Download
macOS packages	Download
UI artifacts	Download
UI macOS artifacts	Download

GHCR images (amd64)

• ghcr.io/netbirdio/management:pr-6661
• ghcr.io/netbirdio/netbird-server:pr-6661
• ghcr.io/netbirdio/netbird:pr-6661
• ghcr.io/netbirdio/relay:pr-6661
• ghcr.io/netbirdio/reverse-proxy:pr-6661
• ghcr.io/netbirdio/signal:pr-6661
• ghcr.io/netbirdio/upload:pr-6661

This comment is updated by the Release workflow. Artifact links expire according to the workflow retention policy.