Clarify nearby sharing ownership and prepare Sync360 0.6.1

[CodePandaaAI]

Summary

This update continues Sync360’s ownership-focused rebuild and prepares version 0.6.1.

It makes nearby sharing easier to understand at both the implementation and product levels:

• discovery means finding devices to send to;
• advertising means allowing nearby devices to find this device;
• Send and Receive now present those responsibilities separately.

Nearby networking

• Split the shared NetworkServices contract into explicit discovery and advertising start/stop operations.
• Simplified NetworkServicesController while keeping HTTP and TCP listeners alive across nearby-service restarts.
• Rebuilt the Android NSD implementation around explicit callback and listener ownership.
• Use DiscoveryRequest and ServiceInfoCallback on Tiramisu extension 22 and newer.
• Retain the legacy DiscoveryListener and serialized one-shot resolution path below extension 22.
• Updated Android, Desktop, Windows, and iOS implementations for the explicit contract.
• Preserve real FailedToStart and CleanupFailed states instead of hiding them behind generic UI errors.

UI and product clarity

• Send now presents only device-search status and nearby devices.
• Receive now presents only nearby visibility and receiving information.
• Both screens reuse the same underlying Start, Stop, and Retry operations.
• Added warning badges to the relevant navigation item when discovery or advertising needs attention.
• Disabled misleading actions while the corresponding native operation is starting or stopping.
• Redesigned the idle Receive screen around:
  • the advertised device name;
  • the file-transfer code;
  • nearby visibility.
• Added advertised-name presentation for Android, Desktop, and iOS.
• Kept Desktop hostname lookup off the UI thread.
• Refined empty discovery and active-search presentation.

Release metadata

• Android version code: 11
• Android version name: 0.6.1
• Desktop package version: 0.6.1
• iOS build number: 11
• iOS marketing version: 0.6.1

Validation

Previously observed manually on Android:

• modern discovery finds, updates, and removes devices;
• legacy discovery starts and queues resolutions;
• advertising starts normally;
• foreground device addition and removal work.

The final 0.6.1 APK and MSI have not yet been built or validated after the latest UI changes.

Known limitations

• Android 17 ACCESS_LOCAL_NETWORK handling is not implemented.
• A foreground Start arriving while Android NSD is still stopping is not automatically replayed.
• Modern Android discovery currently reports Running before the asynchronous callback-registration success signal.
• Legacy late-resolution and multi-network ownership edge cases remain open.
• Windows packages are unsigned and may trigger an unknown-publisher or SmartScreen warning.