* Fix nRF52 freeze + watchdog reset when saving config over BLE
Since #10967 phone-originated admin messages are handled synchronously on
Bluefruit's BLE event task. NRF52Bluetooth::disconnect() busy-waited for
BLE_GAP_EVT_DISCONNECTED, which only that same task can process, so any
config save that requires a reboot (e.g. position) deadlocked the device
until the 90s watchdog fired. Bound the wait to 1s and sleep instead of
spinning so lower-priority tasks (including the watchdog feed) keep
running; the SoftDevice completes the link termination on its own.
* Address review: use Throttle helper, tighten comment
* Name the disconnect timeout constant
* Log unconfirmed BLE disconnect at WARN with elapsed time
Ben Meadors
3f4e7cc622