feat: add generateSlug utility function, tests, and Jest config

[dantesb777]

Summary

This PR adds a utility function generateSlug used to create URL-friendly slugs for text values like assets, categories, and departments.

What's included:

• ✅ generateSlug.ts in frontend/lib/utils
• ✅ Converts strings to lowercase, removes special characters, replaces spaces with hyphens
• ✅ Handles accented Unicode characters (e.g., á, ñ)
• ✅ Unit tests using Jest in generateSlug.test.ts
• ✅ Jest configuration added via jest.config.js

How to test:

npx jest frontend/lib/utils/generateSlug.test.ts

[vercel]

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[dantesb777]

Hi! I've submitted a PR for this issue. All tests passed and it's ready for review. Let me know if I should change anything. Thanks!