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fix: use slice() instead of subarray() to correctly copy VAD audio buffer #449

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The previous implementation used subarray() which returns a view of the original buffer, causing the copied data to be inadvertently overwritten during subsequent processing.

Although a past fix removed the padding from the copied data to mitigate the issue, this made the prefixPaddingDuration parameter ineffective.

This commit replaces subarray() with slice() to ensure a proper copy is made, preventing unwanted side effects and restoring correct behavior of prefix padding.

…ffer

The previous implementation used `subarray()` which returns a view of the original buffer,
causing the copied data to be inadvertently overwritten during subsequent processing.

Although a past fix removed the padding from the copied data to mitigate the issue,
this made the `prefixPaddingDuration` parameter ineffective.

This commit replaces `subarray()` with `slice()` to ensure a proper copy is made,
preventing unwanted side effects and restoring correct behavior of prefix padding.
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