fix(genai): include audio usage token details#1864
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Description
Fixes #1821.
This maps audio token counts from Google GenAI usage metadata into LangChain usage metadata. The response converter already reads aggregate token counts, but it ignored
prompt_tokens_detailsandcandidates_tokens_details, so TTS/audio responses lost theiraudiotoken breakdown.Relevant issues
Fixes #1821
Type
🐛 Bug Fix
Changes(optional)
input_token_details.audioandoutput_token_details.audiowhen present.GenerateContentResponse.Testing(optional)
uv run pytest tests/unit_tests/test_chat_models.py::test_response_to_result_includes_audio_usage_metadatauv run pytest tests/unit_tests/test_chat_models.py -k audiomake testfromlibs/genaimake lintfromlibs/genaiNote(optional)
I used Codex to help inspect the issue, implement the targeted change, and run the local validation commands. I reviewed the resulting diff before opening this PR.