🛡️ Sentinel: [HIGH] Fix XSS vulnerability in SchemaScript

[hadsern]

🚨 Severity: HIGH
💡 Vulnerability: XSS vulnerability in SchemaScript when injecting JSON.stringify data into script tags via dangerouslySetInnerHTML. JSON.stringify does not escape HTML control characters like <, >, and &, meaning injected user data could potentially be interpreted as executable HTML/JavaScript.
🎯 Impact: An attacker could potentially inject malicious scripts, leading to Cross-Site Scripting (XSS) attacks.
🔧 Fix: Manually escaped <, >, and & to their unicode equivalents (using literal double backslashes, e.g., \u003c) when serializing JSON for injection into <script> tags in src/components/SchemaScript.tsx. Added a learning entry to .jules/sentinel.md.
✅ Verification: Ran pnpm test, pnpm build, and verified the changes do not break existing functionality.

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PR created automatically by Jules for task 13420702072694039658 started by @hadsern

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