🛡️ Sentinel: [HIGH] Fix XSS Attribute Breakout in escHtml

[khangnghiem]

🚨 Severity: HIGH
💡 Vulnerability: The custom HTML escaping function escHtml in site/layers.js incorrectly omitted the single quote replacement entirely. This allowed for attribute breakout vulnerabilities when inserting untrusted input into single-quoted HTML attributes.
🎯 Impact: An attacker could potentially inject malicious scripts if untrusted data is passed to escHtml and then inserted into a single-quoted HTML attribute, leading to Cross-Site Scripting (XSS).
🔧 Fix: Updated escHtml to use .replace(/'/g, ''') and cast the input to String(s) to ensure complete escaping of single quotes and prevent crashes on null/undefined values.
✅ Verification: Ran node --check site/layers.js to validate syntax and cd fd-vscode && pnpm test to run the test suite. All tests passed.

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PR created automatically by Jules for task 5171890118654489 started by @khangnghiem

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