Promote to production: voice-to-text model cache + audio pause - #77
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Two issues from testing: - Every Transcribe click re-initialized the Whisper pipeline (re-reading weights, re-running the load progress, blocking the thread). Cache the built transcriber by model id and reuse it; the download progress now only shows on first load. - The audio preview kept playing when pressing stop because ONNX inference blocks the main thread and freezes the native controls. Pause the preview programmatically when transcribe (or a new recording) starts. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
fix(voice-to-text): cache model + pause preview during transcribe
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Caches the Whisper transcriber (no re-init per click) and pauses the preview during transcribe.
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