fix(android): use AACP connected devices for socket liveness check

inputStream.available() returns 0 on dead sockets instead of throwing,
so it can't detect stale connections. Use aacpManager.connectedDevices
which is cleared on disconnect and only populated after successful
AACP handshake - a reliable indicator of actual socket health.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: teng-lin

android/app/src/main/java/me/kavishdevar/librepods/services/AirPodsService.kt

@@ -2428,7 +2428,7 @@ class AirPodsService : Service(), SharedPreferences.OnSharedPreferenceChangeList
         HiddenApiBypass.addHiddenApiExemptions("Landroid/bluetooth/BluetoothSocket;")
         val uuid: ParcelUuid = ParcelUuid.fromString("74ec2172-0bad-4d01-8f77-997b2be0722a")
         val socketActuallyAlive = isConnectedLocally && this::socket.isInitialized &&
-            try { socket.inputStream.available(); true } catch (_: Exception) { false }
+            socket.isConnected && aacpManager.connectedDevices.isNotEmpty()
         if (!socketActuallyAlive) {
             if (isConnectedLocally) {
                 Log.d(TAG, "isConnectedLocally was true but socket is dead, resetting")