Language selection ranked only the user's spoken languages, so a user who speaks
one language always got that language. With spoken=["en"], Portuguese audio
detected at 0.968 pt was sent as language=en, and Whisper answered with a rough
English rendering rather than a transcript. `translated` stayed false, so nothing
downstream could tell a translation had happened, and detectedLanguage reported
"en" for audio that was not English.
Take Whisper's top language when it clears 0.5, and fall back to the spoken
languages only when the clip really is ambiguous — which is the case the bias was
written for.
Verified against the local whisper server with pt/en/es recordings:
spoken=["en"] pt -> translated English, es -> translated English, en -> as-is
spoken=["en","pt"] pt -> Portuguese transcript, no translation
spoken=[] pt -> Portuguese transcript
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
