Three player-board polish tweaks:
1. Per-section Chờ indicator. Each section's label band glows amber
while any of its 3 rows is one cell from bingo. Uses the same amber
as the toast so colour stays consistent. Animation respects
prefers-reduced-motion.
2. Confetti threshold drops from 3+ bingos to: 2nd bingo OR 1st bingo
while another row is in Chờ. The old threshold rarely fired on a
9-row card so most wins felt under-celebrated.
3. Confetti emoji set adds 🥢🎋🏮 (chopsticks, bamboo, lantern) for
hội-chợ flavour, plus per-piece size jitter (1.5–2.4rem) via a
--size CSS variable.