Add edge case tests for validateAudio

[ysdede]

What: Missing edge case tests for validateAudio.
Coverage: Tests for type validation (TypeError for Arrays, strings, null), finite values (Error for NaN and Infinity), happy path for valid Float32Array and Float64Array, and empty arrays.
Result: Increased test coverage and confidence in validateAudio edge cases.

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PR created automatically by Jules for task 8709087404552855067 started by @ysdede

Summary by Sourcery

Add edge case coverage for audio validation and expose the validateAudio helper for external use.

Enhancements:

• Export validateAudio from the long audio module so it can be used and tested externally.

Tests:

• Add tests verifying validateAudio rejects invalid input types such as arrays, strings, null, undefined, and plain objects.
• Add tests ensuring validateAudio throws when audio buffers contain non-finite values like NaN or Infinity.
• Add tests confirming validateAudio accepts empty typed arrays and finite Float32Array/Float64Array inputs.

[sourcery-ai]

Hey - I've left some high level feedback:

• If validateAudio is intended to remain an internal helper, consider avoiding exporting it directly just for tests (e.g., test via the public API or expose it through a dedicated internal/testing export) to prevent unnecessary expansion of the public surface.
• In the throws TypeError for invalid types test, using it.each/test.each (or separate test cases) instead of a loop would make it easier to identify which specific input caused a failure when the assertion breaks.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- If `validateAudio` is intended to remain an internal helper, consider avoiding exporting it directly just for tests (e.g., test via the public API or expose it through a dedicated internal/testing export) to prevent unnecessary expansion of the public surface.
- In the `throws TypeError for invalid types` test, using `it.each`/`test.each` (or separate test cases) instead of a loop would make it easier to identify which specific input caused a failure when the assertion breaks.

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