A dropped BLE connection ended the Live Activity immediately, which
flickered off and on during the brief, routine disconnects that happen
constantly while driving. It now waits 12s before actually ending, and
if the sensor reconnects within that window the pending end is simply
cancelled. If the disconnect does outlast the grace period and the
activity really ends, reconnecting afterwards restarts it automatically
with the last known reading, since that wasn't a deliberate user stop.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
