🛡️ Sentinel: [CRITICAL] Fix attribute-based XSS in HTML escaping

[khangnghiem]

🚨 Severity: CRITICAL
💡 Vulnerability: The custom HTML escaping function (escHtml) in site/layers.js failed to cast inputs correctly using String() and entirely missed escaping single quotes (').
🎯 Impact: This allowed attribute-based Cross-Site Scripting (XSS). If user-controlled input containing a single quote was fed into this function and rendered inside an HTML attribute (e.g. data-node-id='@userInput'), the attacker could break out of the attribute and inject malicious event handlers or structural elements, leading to arbitrary JavaScript execution.
🔧 Fix: Added String() casting to ensure inputs are handled correctly, and added string replacement to escape single quotes (') as ' within the escHtml function. Appended a journal entry logging the pattern.
✅ Verification: Ran grep to verify the patch and node --check to confirm syntax correctness. Ran vitest in fd-vscode where similar fixes were made to ensure no regressions. Code review returned #Correct#.

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PR created automatically by Jules for task 4045965761129508026 started by @khangnghiem

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