Potential fix for code scanning alert no. 24: Insecure randomness

[neolace]

Potential fix for https://github.com/neolace/flint/security/code-scanning/24

To address the issue, we will replace the use of Math.random() with a cryptographically secure random number generator. For Node.js, we can use the crypto module's randomBytes function to generate secure random values. For the browser environment, we can use crypto.getRandomValues. Since the codebase appears to be TypeScript, we will ensure type compatibility.

Specifically:

1. Replace Math.random() in randomEmail, randomTeamName, and randomPassword with a secure random value generated using crypto.randomBytes.
2. Update the random.ts file to import the crypto module and use it for secure randomness.

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