LWT JavaScript API
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    • Migrate TTS settings from cookies to localStorage.

      Old cookie format:

      • tts[{lang}Voice] - voice name
      • tts[{lang}Rate] - rate value
      • tts[{lang}Pitch] - pitch value
      • tts[{lang}RegName] - alternative voice name key

      This function detects existing TTS cookies, migrates them to localStorage, and removes the old cookies.

      Returns number

      Number of languages migrated