Previously, play() was only called from the canplay listener which can
fire too late or be missed with HLS.js. Now also triggers on
Hls.Events.MANIFEST_PARSED (the earliest reliable point), and calls
play() directly after video.load() for MP4/native-HLS paths. Also
fixes _ytpLoadSource (SPA transitions) to use the same pattern.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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