🛡️ Sentinel: [HIGH/MEDIUM] Fix transitive dependency vulnerabilities via overrides

[google-labs-jules]

🚨 Severity: HIGH / MEDIUM
💡 Vulnerability: The project contained transitive dependencies (brace-expansion, nanoid, postcss) with known vulnerabilities (DoS, infinite loop, info disclosure) reported by npm audit.
🎯 Impact: Potential Denial of Service and Information Disclosure attacks related to the build pipeline and transitive dependencies.
🔧 Fix: Updated the overrides section in package.json to force secure versions of these dependencies ("brace-expansion": "^5.0.9", "nanoid": "^3.3.18", "postcss": "^8.5.23").
✅ Verification: Ran npm audit which now reports 0 vulnerabilities. Tests and build passed successfully.

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PR created automatically by Jules for task 9538834022365443354 started by @johannmx

[google-labs-jules]

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