Fix crypto.randomUUID compatibility, email validation, Fisher-Yates shuffle, and querySelector null safety#18

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copilot/update-session-id-logic

Commits on Apr 7, 2026

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Fix session ID generation, email validation, shuffle algorithm, and null safety issues

Copilot
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rondlite
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Address review feedback: fix consecutive dots in email sanitization and explicit UUID hex slice bounds

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rondlite
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