Secondary transcripts may use different field names than primary
transcripts. Updated renderTranscriptSegment to check for:
- start_seconds (primary format)
- start (alternate format)
- offset (common in media APIs)
- time, timestamp, startTime (other variations)
Also handles millisecond timestamps automatically by detecting
values > 10000 and converting to seconds.
Added console logging of secondary segment structure for debugging.
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Co-Authored-By: Claude <noreply@anthropic.com>