Flip status to "closing" the instant the round timer expires, rather than
leaving it "open" (invisible) while in-flight bets confirm — /rounds/current
now surfaces this wait as its own phase instead of collapsing it into
"drawing". _tick() is updated to keep re-checking pending bets while status
is "closing" instead of short-circuiting on the old "status != open" guard.
Also re-stamp closed_at at actual payout confirmation time (not at the
earlier "closing" transition), since round_cooldown_seconds counts from
closed_at — with a short cooldown (e.g. 20s) and ~2 block-time draw+payout
wait, the old anchor meant the cooldown had already elapsed by the time the
round actually closed, making it a no-op.
Expose draw_block_height/draw_block_hash on GET /rounds/current so clients
can show which block the winner was drawn from.
davide
877a219aa4