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install.py: restore transformers>=5.0.0 (capping it would break other nodes). generator.py: catch the torchcodec RuntimeError that fires when ref_text is blank and transformers 5.x auto-transcription requires missing FFmpeg libs. Raises a human-readable error telling the user to fill in ref_text manually. Also updates the ref_text tooltip to recommend providing it explicitly. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>