[Dhruv-158]

Summary

• Replace the Math.random() UUID helper with crypto.randomUUID().
• Keep generateUUID() and its call sites unchanged.
  Closes Replace custom UUID v4 helper with native crypto.randomUUID() #1551

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[Dhruv-158]

Updated generateUUID() to use crypto.randomUUID() when it exists, and crypto.getRandomValues() otherwise. That covers a phone opening the dev server over a non-localhost HTTP address, so ActiveChatProvider can still render.