Each game in a multi-game bracket series (e.g. Game #1 on Mar 23,
Game #2 on Mar 25) now appears as its own row on the calendar with its
own date and "Round Game #x" label. Single-game matchups are unchanged.
Grouping key changes from eventId to eventId|gameNumber for series events.
The max-game-number lookup now runs before grouping so the correct key
can be determined while processing each row.
https://claude.ai/code/session_01CRrqu43FKHshpJt1NyrDdX
01b012e09c