Critical fixes for SSID detection on Android 12+:
- Add CHANGE_WIFI_STATE permission (NetworkCallback registration)
- Add ACCESS_BACKGROUND_LOCATION permission (SSID access)
- Add FOREGROUND_SERVICE_DATA_SYNC permission
SettingsActivity improvements:
- Add checkBackgroundLocationPermission() method
- Show dialog explaining need for 'Always allow' location
- Request permission with proper callbacks
- Better user feedback for permission grants/denials
NetworkMonitor improvements:
- Add initial WiFi check in startMonitoring()
- Add NET_CAPABILITY_INTERNET to NetworkRequest
- Better error handling for '<unknown ssid>' cases
- Log warning about missing BACKGROUND_LOCATION permission
This should fix the root cause: SSID was showing as '<unknown ssid>'
because app lacked background location permission on Android 16.
User must select 'Always allow' when prompted for location permission.
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