Add Gemini 3.5 Transcribe as a desktop STT provider

[ComputelessComputer]

Summary

Problem: Gemini 3.5 Transcribe is now available in Google AI Studio, with a live model for captions during recording and a file model for speaker labels and word timestamps. Settings only offered Google Cloud Speech-to-Text, which uses a different API, auth, and host.

Fix: Add a Google Gemini STT provider (google_generative_ai) that uses an AI Studio API key. Live captions use gemini-3.5-transcribe-live over the Live API; after recording, gemini-3.5-transcribe goes through the Interactions API with speaker diarization and word timestamps. Selecting the file model forces batch mode so live is not called with the wrong model ID. This stays BYOK and is not added to the Anarlog Pro proxy.

Batch requests omit language hints when none are selected (auto-detect), matching the live path. Live inputTranscription events stay normal committed captions (from_finalize: false) rather than looking like an end-of-stream flush.

Verification

• cargo test -p owhisper-client --lib
• cargo test -p owhisper-client --lib adapter::google_generative_ai
• cargo test -p listener-core --lib
• cargo test -p listener2-core --lib
• cargo test -p transcribe-proxy --lib
• pnpm exec dprint check on changed non-Swift files
• pnpm -F desktop typecheck
• pnpm -F desktop test
• pnpm exec oxlint --quiet --format=github apps/desktop/src/

Skipped cargo test -p tauri-plugin-transcription here because this environment is missing GTK/WebKit for the Tauri/specta export test. plugins/transcription/js/bindings.gen.ts includes google_generative_ai on BatchProvider.

  

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Cursor Bugbot has reviewed your changes using default effort and found 2 potential issues.

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Live finals marked as finalize events

Medium Severity

Every inputTranscription event sets from_finalize to true along with is_final. Other live adapters keep from_finalize false except for an actual finalize flush. Downstream live handling that special-cases from_finalize can treat each Gemini utterance as an end-of-stream result rather than a normal committed caption.

 

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