Widen thumbnail sampling window past platform bumpers
Many course platforms (Pluralsight, Packt, ...) open with a generic branded bumper animation running 10-20s before the actual course title card. The 8s candidate window landed squarely inside that bumper and grabbed the platform logo instead of anything course-specific. Candidates now spread across the first ~25s. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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