Fixed LLM and embedding validation occurs for every indexing update

[magesh-presidio]

Description

Replaced useEffect() with useDeepCompareEffect()

• useDeepCompareEffect performs a deep equality check on dependencies, preventing effect re-runs when object references change but the content remains the same.
• Validation now only occurs when the actual configuration values change, not during unrelated state updates.

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update

Pre-flight Checklist

• Changes are limited to a single feature, bugfix or chore (split larger changes into separate PRs)
• Tests are passing (npm test) and code is formatted and linted (npm run format && npm run lint)
• I have reviewed contributor guidelines