Fixing VAD

[PrinceBaghel258025]

• disable record button until model file loads
• efficient hash table for handling text chunks
• Implement user preferred language for generating answers

[sweep-ai]

Hey @PrinceBaghel258025, here are examples of how you can ask me to improve this pull request:

@Sweep Fix the CI errors.

@Sweep Add unit tests for the `VadAudio` component to verify:
1. The record button is disabled when `vad.loading` is true
2. The record button is disabled when `isTranscribing` is true and `vad` is not listening
3. The `onStartListening` and `onStopListening` callbacks are called correctly

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