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fix: Resample audio for Whisper compatibility#6

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fix/whisper-resampling
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fix: Resample audio for Whisper compatibility#6
google-labs-jules[bot] wants to merge 1 commit intomainfrom
fix/whisper-resampling

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This PR fixes the Speech-to-Text functionality by ensuring the recorded audio is correctly resampled to 16000Hz, which is required by the Whisper model.
Previously, the code assumed the browser would respect the sampleRate constraint, which is not guaranteed.
A manual resampler is added to handle the conversion from the device's native sample rate (e.g., 44.1kHz or 48kHz) to 16kHz.


PR created automatically by Jules for task 15563551943597362381 started by @Ryan-Guo123

- Remove unsupported `sampleRate` constraint from AudioContext
- Add manual linear interpolation resampling to 16kHz in `useWhisper.ts`
- Ensure worker receives correctly formatted audio data
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