Keep the "transitioning" overlay visible until the <img> element's
bitmap is fully decoded, so the user never sees progressive paint
or a blank flash between scenes.
- Add onImageReady callback to PlayCanvas (<img onLoad> + decode())
- Delay setPhase("ready") until decode resolves (3s timeout fallback)
- Applied to all 4 scene entry paths: prebaked card, live /api/start,
performSceneTransition, and recorded replay transition
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
yuanzonghao
e3ee3547e5