[luisguzman-adfa]

What changes

• Clone send releases the Wi-Fi Direct hotspot on Stop sharing, on a switch to Wi-Fi and on leaving Clone.
• LocalHotspotManager records who holds the hotspot (Connect, Clone, Content Exchange share). The last release() stops it. This replaces the per-feature ownership flags.
• Clone receive stops the own hotspot and waits until the sender address is not local before it probes (same guard as Content Exchange receive). The local-address check moves to NetworkInterfaces.isLocalAddress.
• The hotspot band defaults to Automatic (was 2.4 GHz). A stored choice is kept.
  (UI changes: no string added or changed. A new install shows "Automatic" in Settings > Hotspot > Wi-Fi band.)

Why

• A Wi-Fi Direct group left up made a later receive reach its own 192.168.49.1, and slowed Wi-Fi to about 1 MB/s.
• A 2.4 GHz group next to 5 GHz Wi-Fi makes the radio split time between two channels: Clone over the hotspot ran at about 3 MB/s. Automatic puts the group on the channel of the connected Wi-Fi.

Verifications

• OnePlus 7T -> Samsung A16 on device:
  • The group goes down on the switch to Wi-Fi and on Stop sharing.
  • Clone over Wi-Fi: about 50 MB/s.
  • Clone over the hotspot with the group on the Wi-Fi channel: about 44 MB/s (was about 3 MB/s on 2.4 GHz).
  • Automatic picked 5240 MHz, the channel of the connected Wi-Fi.
• HotspotBandTest passes.

Notes

• Deferred: the group still outlives a process death (force-stop or OOM kill) during a send. Related: K2GO-470.