sessioneScaduta compared Date.now() against NaN when aggiornato_il was
not a valid date, and every comparison with NaN is false: the session
was reported as still active, so the Scout Live table stayed locked to a
player who could no longer release it.
An unreadable timestamp now frees the session, which is the safe
direction: at worst someone takes over a scouting session that was
already unattended.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
