- FightViewer: wrap createFightScene in try/catch so scene failures
don't crash every subsequent playRound call
- FightViewer: wait for container to have non-zero dimensions before
creating canvas (prevents 0x0 canvas causing sprite load failures)
- FightViewer: graceful log-only fallback when scene init fails
- FightPage: same dimension-wait and try/catch for initLiveScene
- Fallback canvas dimensions (800x500) when container not yet laid out
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>