Fix voting start time race condition

Set votingStartAt to 1 minute in the past when opening/reopening rounds
or awards. This ensures voting is immediately available without the
"opens in less than a minute" message appearing due to timing differences
between when the date is set and when the page renders.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/server/routers/round.ts

@@ -268,7 +268,9 @@ export const roundRouter = router({
 
       if (input.status === 'ACTIVE' && previousRound.status !== 'ACTIVE') {
         if (previousRound.votingStartAt && previousRound.votingStartAt > now) {
-          updateData.votingStartAt = now
+          // Set to 1 minute in the past to ensure voting is immediately open
+          const oneMinuteAgo = new Date(now.getTime() - 60 * 1000)
+          updateData.votingStartAt = oneMinuteAgo
           votingStartAtUpdated = true
         }
       }