Use optimal alignment heads in Whisper conversion #1401
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The Whisper conversion script now uses optimal alignment heads for word-level timestamp extraction when loading from Hugging Face repos.
Previously, these optimal alignment heads were only set when using short model names (e.g., "tiny", "base"). Loading from Hugging Face repos like
openai/whisper-large-v3would skip the alignment heads lookup, falling back to the default of using all heads in the last half of decoder layers.