Add WebVTT (.vtt) subtitle file support#1691

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Momen-Walied wants to merge 3 commits intomicrosoft:mainfrom

Momen-Walied:feature/vtt-converter

Commits on Apr 10, 2026

test(vtt): add test vectors for WebVTT support
Momen-Walied
committed
feat(vtt): implement WebVTT converter with security features
Momen-Walied
committed
fix(vtt): address review feedback - voice class regex and timestamp tests
Momen-Walied
committed