Add AudioEngineV2 state playwright tests

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[bjsplat]

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Visualization tests for WebGPU

https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/16437/merge/testResults/webgpuplaywright/index.html

[Copilot]

Pull Request Overview

This PR adds state-based Playwright tests for AudioEngineV2 functionality. It introduces configuration changes to include audioV2 tests and adds multiple tests to validate various state transitions of the audio engine.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
playwright.config.ts	Added a new configuration block to run tests in the audioV2 directory using a dedicated use definition.
packages/tools/tests/test/audioV2/audioEngineV2.state.test.ts	Introduced several tests that simulate user gestures and engine state transitions for AudioEngineV2.