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CompositionThumbnail now takes one screenshot at the midpoint and stretches it across the clip (object-cover), same approach as After Effects for precomps. Avoids 6x Puppeteer render cost per composition. Timeline shift+drag range selection now works even when starting on a clip — the [data-clip] early return was blocking the shiftKey check. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>