- Fix computeEliminatedByRound() to track participant1Id/participant2Id
in addition to winnerId/loserId, so a 7v8 play-in loser placed in a
PIR2 slot (incomplete match) is not shown as eliminated on the league page
- Replace separate Recalculate Floors and Reprocess Eliminations buttons
with a single Reprocess Bracket action that replays all matches and
re-marks non-bracket participants as eliminated
- Add NBA play-in test cases for the elimination computation logic