fix(xai): emit interim transcripts for in-progress status in realtime#6272
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xAI streams partial transcripts through the same conversation.item.input_audio_transcription.completed event as the final one, distinguishing them with a status field ("in_progress" vs "completed"). The handler delegated to the OpenAI base handler, which ignores status and always emits is_final=True, so every partial was surfaced as a final transcription and produced a duplicate conversation item for a single utterance.
Emit InputTranscriptionCompleted(is_final=False) for in-progress transcripts and only delegate to the base handler (is_final=True) for the final one. A missing status defaults to final.
Fixes livekit#6271
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Fixes #6271
xAI streams partial transcripts through the same conversation.item.input_audio_transcription.completed event as the final one, distinguishing them with a status field ("in_progress" vs "completed"). The handler delegated to the OpenAI base handler, which ignores status and always emits is_final=True, so every partial was surfaced as a final transcription and produced a duplicate conversation item for a single utterance.
Emit InputTranscriptionCompleted(is_final=False) for in-progress transcripts and only delegate to the base handler (is_final=True) for the final one. A missing status defaults to final.