perf: improve H264 playback on low-end machines; v1.7.3#27
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Decouple playback clock from MCAP prefetch, add adaptive H264 backpressure with IDR resync, hardware-preferring WebCodecs config, and benchmark tooling so progress and video stay responsive under decode pressure.
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Summary
Test plan
npm test(644 passed)npm run lintnpm run buildnpm run test:e2e(37 passed)npm run benchmark:h264on representative MCAP files (episode_00344,episode_00340)